JP5487797B2 - AC generator - Google Patents

Description

  The present invention relates to an AC generator, and more particularly to an AC generator that can supply power to a load with a plurality of power supply specifications.

  In a construction site or the like, in addition to a three-phase 200V power source that is a power source for construction equipment, a single-phase 100V power source and a single-phase 200V power source that are power sources for lighting equipment and electric tools are required. For this reason, as an AC generator conventionally used at a construction site or the like, a portable type capable of supplying power simultaneously to a power load of a plurality of power source specifications or power types (for example, three-phase AC output, single-phase AC output). An engine-driven generator is provided (see, for example, Patent Document 1). In this specification, the term power supply specification indicates the type of power supply specified by voltage, frequency, number of phases, and the like.

  The AC generator described in Patent Document 1 has an armature winding including a three-phase winding and a single-phase three-wire winding having a part of the three-phase winding as a common winding portion. . With this armature winding, the AC generator described in Patent Document 1 can supply a three-phase AC output (for example, three-phase 200 V) from a three-phase winding, and a single-phase AC from a single-phase three-wire winding. Outputs (eg, single phase 100V and single phase 200V) can be supplied. Therefore, this generator can supply power to the load with three types of power supply specifications (three-phase 200 V, single-phase 200 V, and single-phase 100 V) having different rated values. In this generator, each power supply specification can be used alone, or a plurality of these arbitrary power supply specifications can be used simultaneously.

  In such a generator, it is possible to connect an additional load with a single-phase 100V power supply specification while supplying power to the load with a single-phase 100V power supply specification, for example. It is also possible to connect an additional load with a single-phase 200V or three-phase 200V power supply specification while supplying power to the load with a single-phase 100V power supply specification. In this case, it is necessary to connect an additional load so as not to exceed the rated power of the generator, and the load that can be additionally connected is equal to or less than the remaining capacity of the generator.

  Moreover, in the generator of patent document 1, when the big electric power load exceeding a rated value is connected, the electric current exceeding a rated current flows into an armature winding. The generator is configured to cut off the output wiring and disconnect the load from the generator when such an excessive current is detected. Thereby, in this generator, it can prevent that an excessive electric current continues flowing into an armature winding.

JP 2008-172919 A

  In a generator as described in Patent Document 1, for example, while power is being supplied to a load with a single-phase 100 V power supply specification, the user subtracts the connected load power from the rated power of this power supply specification. Thus, the remaining capacity of the power supply specification in use can be calculated. For this reason, when supplying power to an additional load with this power supply specification, whether the additional load is less than the remaining capacity (that is, whether the additional load can be connected) is determined by the user. Can be easily determined.

  However, for example, when supplying power to a load with a single-phase 100V power supply specification and supplying power to an additional load with a different power supply specification (for example, single-phase 200V or three-phase 200V), connection is being attempted. The load power amount or remaining capacity that can be used in the power supply specification of the load could not be easily estimated.

  For this reason, the case where the load of capacity over was connected to the vacant output terminal (for example, three-phase 200V) has arisen. In such a case, since the output wiring is interrupted, there is a problem in that power supply to all loads including the first load used (for example, single-phase 100 V in the above example) may be stopped. there were.

  In addition, since the generator disclosed in Patent Document 1 is configured so that a cut-off wiring can be selected, even when an overload is additionally connected to a vacant output terminal, selection of the cut-off wiring is possible. Accordingly, it is possible to avoid the interruption of the supply power to the first load. However, since it is not known exactly how much load is allowed to be used, connect an additional load in the hope that the output wiring will not be cut off, or make it smaller than the remaining capacity to avoid interruption. I was forced to connect a load of the capacity.

  The present invention has been made to solve such a problem, and in an AC generator capable of supplying power to a load with a plurality of power supply specifications, when a user connects an additional load, an error occurs. Therefore, an object of the present invention is to provide an AC generator that can avoid connecting a load that exceeds the capacity, and that enables efficient load selection.

  In order to solve the above-described problems, the present invention provides a three-phase winding or a single-phase winding, and a single-phase winding portion including at least a part of the three-phase winding or the single-phase winding as a common winding portion. , An AC generator capable of taking out power with a plurality of power supply specifications having different rated values from the armature winding, and having a current value output from the output terminal of the armature winding. Based on the output current value calculation unit to calculate, the output voltage value calculation unit to calculate or store the voltage value for the output terminal of the armature winding, the current value and voltage value, and the rated value of multiple power supply specifications Further, the present invention is characterized in that a remaining capacity calculation unit that calculates the remaining capacity of power that can be further used in each power supply specification and a remaining capacity display unit that displays the remaining capacity in each power supply specification are provided.

In the present invention configured as described above, it is an AC generator capable of supplying power to a load with a plurality of power supply specifications, and a remaining capacity calculation unit calculates a load that can be further used in the current state in each power supply specification, Each calculated remaining capacity can be displayed on the remaining capacity display section.
Thereby, in the AC generator of the present invention, the connectable power capacity can be grasped before the user connects the load to the output terminal. Therefore, in the generator of this invention, it can avoid beforehand connecting a load which a user becomes an overload accidentally to a generator. Furthermore, in the AC generator according to the present invention, the user can check the remaining capacity, so that it is possible to select a load having an optimum capacity equal to or less than the remaining capacity. For this reason, it becomes possible to use a generator more efficiently.

  Preferably, in the present invention, the rated value of the power supply specification is a rated current value, a rated voltage value, and a rated power value that are allowed when each power supply specification is used alone.

Preferably, in the present invention, the armature winding can extract three-phase AC power and single-phase AC power from the three-phase winding and the single-phase winding portion, respectively, or the single-phase winding and the single-phase winding. Single-phase AC power having different rated values can be extracted from the winding portions.
In the present invention configured as described above, when the armature winding is a type having a three-phase winding and a single-phase winding portion having a part of the armature winding as a common winding portion, the three-phase winding portion Can supply three-phase AC power, and can supply single-phase AC power from a single-phase winding section. In addition, when the armature winding is a type having a single-phase winding and a single-phase winding portion with a part of the armature winding as a common winding portion, the rated value is obtained from the single-phase winding portion and the single-phase winding portion. Can supply different single-phase AC power.

  In the present invention, preferably, the output voltage value calculation unit calculates a voltage value based on a voltage measurement value of the output terminal. In the present invention configured as described above, the remaining capacity can be calculated more accurately by obtaining the voltage at the output terminal of the AC generator from the measurement data.

  Preferably, in the present invention, the output voltage value calculation unit outputs the rated voltage value of each power supply specification as a voltage value. In the present invention configured as described above, the configuration of the alternator can be simplified by obtaining the voltage at the output terminal of the alternator not from the measurement data but from the rated voltage.

  Preferably, in the present invention, the remaining capacity calculation unit calculates a power consumption value for a plurality of power supply specifications based on a current value and a voltage value, and subtracts the power consumption value from a rated power value for the plurality of power supply specifications. To calculate the remaining capacity.

  Preferably, in the present invention, the remaining capacity calculation unit is configured to supply each power source based on a current value and a voltage value, and a current amount that can be further passed through the common winding portion from a rated value of a plurality of power source specifications. The remaining power capacity that can be used in the specification is further calculated.

In the present invention, preferably, the remaining capacity display unit selectively displays the remaining capacity of each power supply specification.
In the present invention, the remaining capacity display unit is preferably a digital or analog display.

  Preferably, in the present invention, an interruption determination unit that outputs an operation signal when it is determined that a current of a predetermined value or more is flowing through the armature winding based on the current value calculated by the output current value calculation unit. And a circuit breaker for wiring that shuts off the connection between the output terminal and the load in response to the operation signal from the shut-off determining unit.

  According to the alternator of the present invention, in an alternator capable of supplying power to a load with a plurality of power supply specifications, when a user connects an additional load, a load that causes an overcapacity is accidentally connected. Thus, the load can be selected so that the AC generator can be used efficiently.

It is a circuit diagram of the generator in a 1st embodiment of the present invention. It is an electrical block diagram of the control board of the generator in 1st Embodiment of this invention. It is a circuit diagram of the generator in the modification of 1st Embodiment of this invention. It is an electric block diagram of the control board of the generator in the modification of 1st Embodiment of this invention. It is a circuit diagram of the generator in 2nd Embodiment of this invention. It is an electrical block diagram of the control board of the generator in 2nd Embodiment of this invention. It is a circuit diagram of the generator in the modification of 2nd Embodiment of this invention. It is an electrical block diagram of the control board of the generator in the modification of 2nd Embodiment of this invention. It is a circuit diagram of the generator in 3rd Embodiment of this invention. It is an electrical block diagram of the control board of the generator in 3rd Embodiment of this invention. It is a circuit diagram of the generator in the modification of 3rd Embodiment of this invention. It is an electrical block diagram of the control board of the generator in the modification of 3rd Embodiment of this invention.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.
(First embodiment)
With reference to FIG.1 and FIG.2, the structure of the alternating current generator by 1st Embodiment of this invention is demonstrated.
The generator 1 according to this embodiment is a single-phase three-wire system, and a single-phase winding 10 that is an armature winding wound around a stator, and a field winding wound around a rotor (see FIG. (Not shown), a circuit breaker 20 for wiring, and a control board 30.

  The generator 1 of this embodiment is configured to be able to supply power to a load with three power supply specifications 1-3. The power supply specifications 1-3 can be used alone or in any combination. The power supply specification 1 is a single-phase AC output with a rated output of 10 kVA, a rated current of 50 A, and a rated voltage of 200 V, and a load is connected between the single-phase output terminals L1 and L2. The power supply specification 2 is a single-phase AC output with a rated output of 5 kVA, a rated current of 50 A, and a rated voltage of 100 V, and is connected between the single-phase output terminals L1-O. The power supply specification 3 is a single-phase AC output with a rated output of 5 kVA, a rated current of 50 A, and a rated voltage of 100 V, and is connected between the single-phase output terminals L2-O.

  The single-phase winding 10 has terminals Ta and Tc and an intermediate terminal Tb. The terminal Tb is set at an intermediate point of the single-phase winding 10 in which the number of windings is equal on the terminal Ta side and the Tc side. Of the single-phase winding 10, the terminal Ta-Tb is the common winding portion 10a, and the terminal Tc-Tb is the common winding portion 10b.

The terminals Ta, Tb, and Tc are connected to the output terminals L1, O, and L2 by wirings 12a, 12b, and 12c, respectively.
Current detection elements (CT in this example) 13a and 13c are arranged on the wirings 12a and 12c, respectively. Further, connection points for voltage measurement are provided on the wirings 12a, 12b and 12c. Specifically, connection points 14a and 14c are provided on the wiring 12a, connection points 14d and 14e are provided on the wiring 12b, and connection points 14b and 14f are provided on the wiring 12c.
In the following description, alternating currents flowing through the wirings 12a, 12b, and 12c are denoted by Ia, Ib, and Ic, respectively.

  Due to the rotation of the rotor, an AC voltage Vac of 200 V (effective value) is generated between the terminals Ta and Tc of the winding 10, and an AC voltage Vab of 100 V (effective value) is generated between the terminals Ta and Tb. An AC voltage Vbc of 100 V (effective value) is generated between the terminals Tb and Tc. The relationship between these voltages is shown in FIG.

  In the generator 1 of the present embodiment, a load can be connected to each of the output terminals L1, O, and L2 so that the power supply specification 1-3 is used alone or a plurality of these are used simultaneously. When the power supply specifications 1-3 are used independently, currents corresponding to the loads flow between the terminals Ta and Tc, between the terminals Ta and Tb, and between the terminals Tc and Tb, respectively. That is, in the power supply specification 1, the entire single-phase winding 10 is used, and in the power supply specifications 2 and 3, the common winding portions 10a and 10b are used as single-phase winding portions, respectively.

  On the other hand, when a plurality of power supply specifications 1-3 are used at the same time, a current corresponding to each power supply specification may flow in a superimposed manner on the common winding portions 10a and 10b of the winding 10. For example, when the power supply specifications 1 and 2 are used at the same time, a current corresponding to the load connected to the power supply specification 1 flows in the entire winding 10 and a current corresponding to the load connected to the power supply specification 2 is common. It flows superimposed on the winding portion 10a.

The circuit breaker 20 for wiring is provided with the interruption | blocking parts 21a and 21c provided in wiring 12a and 12c, respectively, and the operating device 22 which operates the interruption | blocking parts 21a and 21c and makes them open.
The actuating device 22 is configured to electromagnetically actuate the interrupting portions 21a and 21c and to interrupt the wirings 12a and 12c by an actuating signal (for example, a DC 12V voltage signal) from the control board 30. Further, when a current greater than a predetermined current value flows through the wirings 12a and 12c, the blocking units 21a and 21c operate in response to the excessive current, and the wirings 12a and 12c are disconnected by their own blocking function. It is configured to block.

  The control board 30 includes an arithmetic processing unit 31 that is a CPU configured to perform a predetermined process, a circuit breaker circuit breaker 32 that outputs an operation signal to the operation device 22 of the circuit breaker 20, and a remaining capacity. A display selection switch 33 and a remaining capacity display device 34 are provided. The remaining capacity display selection switch 33 and the remaining capacity display device 34 may be provided integrally with the control board main body or may be provided separately.

The arithmetic processing unit 31 includes an A / D conversion unit 31a, an output voltage value calculation unit 31b, an output current value calculation unit 31c, a remaining capacity calculation unit 31d, a remaining capacity display selection unit 31e, and an interruption determination unit 31f. It has.
The A / D converter 31a is connected to the current detection elements 13a and 13c and the voltage measurement connection points 14a to 14f, and converts the analog current measurement signal and the voltage measurement signal received from them into digital signals. . In this example, the A / D converter 31a performs full-wave rectification on the measurement data representing the current value and the voltage value with a rectifier circuit (not shown), and A / D converts this data.

Based on the digital voltage signal received from the A / D conversion unit 31a, the output voltage value calculation unit 31b generates a voltage Vac between the connection points 14a and 14b (voltage of power supply specification 1) and a voltage Vab between the connection points 14c and 14d. The voltage Vbc (voltage of power supply specification 3) between the connection points 14e-14f is calculated.
The output current value calculation unit 31c calculates the currents Ia and Ic flowing through the wirings 12a and 12c based on the digital current signal received from the A / D conversion unit 31a.
In this embodiment, the voltage value and the current value for one cycle are calculated based on the measurement signal or the alternating cycle information (cycle, zero cross point) separately acquired from the rotation speed detection sensor. .

  The remaining capacity calculation unit 31d is further added to each power supply specification based on the voltage value and current value received from the output voltage value calculation unit 31b and the output current value calculation unit 31c and the rated value of the power supply specification 1-3. The amount of connectable load power, that is, the remaining capacity is calculated. The remaining capacity calculation unit 31d acquires data on the rated value from the storage unit that stores the rated values (rated power, rated current, rated voltage) of the power supply specifications 1-3.

  Based on the selection signal from the remaining capacity display selection switch 33, the remaining capacity display selection unit 31e displays the power supply specification selected by the user and the remaining capacity calculated by the remaining capacity calculation unit 31d. An output signal is sent to the display device 34.

  The interruption determining unit 31f determines whether to interrupt the wirings 12a and 12c according to the current current value calculated by the output current value calculating unit 31c, and sends a determination signal based on the determination result to the circuit breaker for wiring. Output to the blocking unit 32.

The circuit breaker breaker 32 for wiring is configured to generate an operation signal in accordance with the determination signal from the arithmetic processing unit 31 and output it to the circuit breaker 20 for wiring.
The remaining capacity display selection switch 33 is a selection switch that can alternatively select the power specifications of the remaining capacity to be displayed on the remaining capacity display device 34 from the power specifications 1-3, and is a selection that represents the selected power specifications. It is configured to output a signal.

  The remaining capacity display device 34 includes a remaining capacity display unit 34a that indicates a remaining power generation capacity (unit kVA) that can be additionally used at the present time, and a power source that indicates power specifications of the remaining capacity displayed on the remaining capacity display unit 34a. A specification display unit 34b. The remaining capacity display unit 34a is a two-digit 7-segment LED display. The power supply specification display part 34b represents a power supply specification selected by lighting of the LED, and is classified into a power supply specification 1 (single phase 200V), a power supply specification 2 (single phase 100V), and a power supply specification 3 (single phase 100V). A corresponding LED is provided.

Next, the operation of the generator 1 of this embodiment will be described.
First, the remaining capacity calculation process performed by the generator 1 will be described. This process is repeated every predetermined time.
As an operation example 1 of the remaining capacity calculation process, an example in which the power supply specification 1 is used is shown. The operation example 1 is an example of processing when a device (rated power 5 kVA, rated current 25 A, rated voltage 200 V) is connected between the output terminals L1 and L2.

  The A / D conversion unit 31a converts analog signals from the connection points 14a, 14b,... 14f and the current detection elements 13a and 13c into digital signals, and outputs the digital voltage signals to the output voltage value calculation unit 31b. The digital current signal is output to the output current value calculation unit 31c.

The output voltage value calculation unit 31b calculates voltages Vac, Vab, and Vbc based on the received voltage signal. Here, it is assumed that the voltage Vac is calculated as 200V, the voltage Vab is 100V, and the voltage Vbc is 100V. In this embodiment, the voltage Vac is calculated based on the digital voltage signal from the connection points 14a and 14b, the voltage Vab is calculated based on the digital voltage signal from the connection points 14c and 14d, and the voltage Vbc is Calculation is performed based on digital voltage signals from the points 14e and 14f.
The output current value calculator 31c calculates the currents Ia and Ic based on the received current signal. Here, it is assumed that the current Ia is calculated as 25A and the current Ic is calculated as 25A. A common winding current of currents Ia and Ic flows through the common winding portions 10a and 10b, respectively.

The remaining capacity calculator 31d receives the voltage value and the current value calculated from the output voltage value calculator 31b and the output current value calculator 31c, and calculates the virtual power consumption based on these data as follows.
Virtual power consumption Sac [kVA] (= V × I) for power supply specification 1 (between output terminals L1 and L2) is voltage V (voltage Vac) and current I (current I is the larger of currents Ia and Ic). Is multiplied by. Here, it is calculated as 5 kVA (= 200 V × 25 A).

Virtual power consumption Sab [kVA] (= V × I) for power supply specification 2 (between output terminals L1 and O) is calculated by multiplying voltage V (voltage Vab) and current I (current Ia). . Here, it is calculated as 2.5 kVA (= 100 V × 25 A).
Virtual power consumption Sbc [kVA] (= V × I) for power supply specification 3 (between output terminals L2 and O) is calculated by multiplying voltage V (voltage Vbc) and current I (current Ic). . Here, it is calculated as 2.5 kVA (= 100 V × 25 A).

Further, the remaining capacity calculation unit 31d calculates the remaining capacity of each power supply specification. The remaining capacity of each power supply specification is calculated by subtracting virtual power usage from each rated output.
Here, the remaining capacity [kVA] for the power supply specification 1 is calculated as 5 kVA (= 10−5) by the remaining capacity calculator 31d. The remaining capacity [kVA] for the power supply specification 2 is calculated as 2.5 kVA (= 5-2.5). The remaining capacity [kVA] for the power supply specification 3 is calculated as 2.5 kVA (= 5-2.5).

  Next, as an operation example 2, an example in which the power supply specification 1 and the power supply specification 2 are used will be described. In Operation Example 2, a device (rated power 5 kVA, rated current 25 A, rated voltage 200 V) is connected between the output terminals L1 and L2, and a device (rated power 2 kVA, rated current 20 A, rated voltage 100 V) is connected between the output terminals L1 and O2. ) Is an example of processing when connected.

  In the operation example 2, it is assumed that the voltage Vac calculated by the output voltage value calculation unit 31b is 200V, the voltage Vab is 100V, and the voltage Vbc is 100V. Further, it is assumed that the current Ia calculated by the output current value calculation unit 31c is 45A and the current Ic is 25A.

The remaining capacity calculation unit 31d calculates the virtual power consumption based on these data in the same manner as in the first operation example.
The virtual power Sac for power supply specification 1 is calculated as 9 kVA (= 200 × 45). The virtual power consumption Sab for the power supply specification 2 is calculated as 4.5 kVA (= 100 × 45). The virtual power consumption Sbc for the power supply specification 3 is calculated as 2.5 kVA (= 100 × 25).

Further, the remaining capacity calculation unit 31d calculates the remaining capacity of each power supply specification as in the first operation example.
The remaining capacity for the power supply specification 1 is calculated as 1 kVA (= 10-9). The remaining capacity for power supply specification 2 is calculated as 0.5 kVA (= 5-4.5). The remaining capacity for the power supply specification 3 is calculated as 2.5 kVA (= 5-2.5).

  Next, as operation example 3, an example in the case of using power supply specification 3 is shown. The operation example 3 is an example of processing when a device (rated power 4 kVA, rated current 40 A, rated voltage 100 V) is connected between the output terminals OL2.

  In the operation example 3, it is assumed that the current Ia calculated by the output voltage value calculation unit 31b is 0A and the current Ic is 40A. Further, it is assumed that the voltage Vac calculated by the output current value calculation unit 31c is 200V, the voltage Vab is 100V, and the voltage Vbc is 100V.

Based on these data, the remaining capacity calculation unit 31d calculates the virtual power consumption as in the first and second operation examples.
The virtual power consumption Sac for the power supply specification 1 is calculated as 8 kVA (= 200 × 40). The virtual power consumption Sab for the power supply specification 2 is calculated as 0 kVA (= 100 × 0). The virtual power consumption Sbc for the power supply specification 3 is calculated as 4 kVA (= 100 × 40).

Further, the remaining capacity calculation unit 31d calculates the remaining capacity of each power supply specification as in the first and second operation examples.
The remaining capacity for the power supply specification 1 is calculated as 2 kVA (= 10−8). The remaining capacity for the power supply specification 2 is calculated as 5 kVA (= 5-0). The remaining capacity for the power supply specification 3 is calculated as 1 kVA (= 5-4).

  In the present embodiment, in order to simplify the calculation process, a method of calculating the remaining capacity using the virtual power consumption assuming the virtual power consumption is employed. This virtual power consumption is a virtual power value calculated on the assumption that the maximum current value flows in all the winding portions among the currents flowing in the winding portions used in the target power supply specification. Therefore, in the present embodiment, of the common winding current flowing through each common winding portion 10a, 10b, a margin (allowable current) up to the rated current (in this case, 50 A set in each power supply specification 1-3). The remaining capacity is calculated using the smaller of the two. Therefore, the remaining capacity calculation method of this embodiment calculates the remaining capacity of each power supply specification based on the margin from the common winding current to each rated current substantially.

  Moreover, you may comprise so that the remaining capacity of each power supply specification may be calculated from an allowable current, without using virtual power consumption. Specifically, for the power supply specification 1, the allowable current amount that can be passed through the single-phase winding 10 (that is, the common winding portions 10a and 10b) until the rated current is reached, and the rated voltage (or voltage Vac). The remaining capacity can be calculated by the product of For the power supply specifications 2 and 3, the remaining capacity is calculated by the product of the allowable current amount that can be passed through the common winding portions 10a and 10b until the rated current is reached and the rated voltage (or voltages Vab and Vbc). Can do.

  For example, in the first operation example, a current of 25 A (= 50 A−25 A) can be further passed through the single-phase winding 10 (that is, the common winding portions 10 a and 10 b). Therefore, in operation example 1, the remaining capacity can be calculated as 5 kVA (= 200 V × 25 A) in the power supply specification 1, the remaining capacity can be calculated as 2.5 kVA (= 100 V × 25 A) in the power supply specification 2, and the remaining capacity can be calculated in the power supply specification 3. Can be calculated as 2.5 kVA (= 100 V × 25 A). Even in this case, the same result as the above calculation result can be obtained.

Next, display processing of the remaining capacity of each power supply specification calculated as described above will be described. This process is also repeated every predetermined time.
The remaining capacity display selection unit 31e receives a selection signal indicating the power supply specification currently selected by the remaining capacity display selection switch 33 from the remaining capacity display selection switch 33, and the remaining capacity of each power supply specification from the remaining capacity calculation unit 31d. Receive.

  Based on the selection signal, the remaining capacity display selection unit 31e drives the remaining capacity display device 34 to display the selected output format and the remaining capacity. As a result, the remaining capacity display device 34 displays the selected power supply specification and the remaining capacity on the power supply specification display section 34b and the remaining capacity display section 34a, respectively.

  For example, in the operation example 1, when the user selects the power supply specification 1 with the remaining capacity display selection switch 33, “5.0” kVA is digitally displayed on the remaining capacity display section 34a, and the power supply specification display section 34b displays “200V”. The LED corresponding to the “” display lights up. Similarly, when the user selects the power supply specifications 2 and 3 with the remaining capacity display selection switch 33, “2.5” kVA and “2.5” kVA are digitally displayed on the remaining capacity display portion 34a, respectively. In the display unit 34b, the LED of “100V” on the left side and the LED of “100V” on the right side are lit.

  Thus, the user can easily know the remaining capacity of each power supply specification by the remaining capacity display device 34, and can select a device having a capacity less than the displayed remaining capacity and connect it to the output terminal. It becomes. As a result, it is possible to avoid the inconvenience that the capacity is over and the wiring is interrupted because the device is selected depending on the intuition of the user as in the past, and the remaining power specifications remain in each power supply specification. The device with the most appropriate or maximum load capacity below capacity can be selected immediately.

Next, the interruption | blocking process which operates the circuit breaker 20 for wiring is demonstrated. This process is also repeated every predetermined time.
Based on the currents Ia and Ic calculated by the output current value calculation unit 31c, the interruption determination unit 31f includes a winding current flowing through the single-phase winding 10 and a common winding current flowing through the common winding portions 10a and 10b. , And compare with the rated current of power supply specifications 1-3 respectively. The winding current flowing in the single-phase winding 10 is the larger of the common winding currents. Specifically, the larger of the currents Ia and Ic is adopted as the winding current flowing through the single-phase winding 10, and the currents Ia and Ic are adopted as the common winding currents flowing through the common winding portions 10a and 10b, respectively. Is done.

  The interruption determination unit 31f acquires a rated current value of each power supply specification and an interruption standby time table from the storage unit. The cutoff standby time table is a table that defines the cutoff standby time from the start of flow to the start of cutoff for the excessive current value when a current exceeding the rated current value flows through the winding. It is. This table is set so that the cutoff standby time is shortened as the load factor (= current value / rated current value) increases. For example, the load factor is 150%, 200%, and 300, and the cutoff standby time is set to 8 seconds, 5 seconds, and 2 seconds, respectively.

  The cutoff determination unit 31f calculates a current load factor for each power supply specification, sets a cutoff standby time according to the load factor, and measures the cutoff standby time. When the interruption standby time for any one of the power supply specifications has elapsed, the interruption determination unit 31f outputs a determination signal instructing interruption to the circuit breaker interruption unit 32 for wiring.

When the wiring breaker breaker 32 receives the determination signal instructing breakage, the wiring breaker breaker 32 outputs an operation signal to the wiring breaker 20 to drive the wiring breaker 20 to the breaker state.
As a result, it is assumed that an excessive current flows through the single-phase winding 10 because the user accidentally connected a device that would exceed the capacity without confirming the remaining capacity display of the remaining capacity display device 34. However, since the load can be electrically disconnected from the generator 1 before an excessive current flows for a long time, an excessive current does not continue to flow through the single-phase winding 10, and the single-phase winding 10 is burned out. Can be prevented.

  In addition, when a large excessive current suddenly flows through the wirings 12a and 12c and the current exceeds the current value set in the interrupting parts 21a and 21c, the interrupting function of the interrupting parts 21a and 21c causes the interrupting parts 21a and 21c. 21c is opened. That is, the circuit breaker 20 for wiring does not receive the operation signal from the circuit breaker circuit breaker 32 for wiring, and thus the circuit breakers 21a and 21c are opened without waiting for the circuit breaker waiting time, and the load is supplied to the generator 1. It is configured to be disconnected from.

Next, FIGS. 3 and 4 show a modification of the generator 1 of the first embodiment. Hereinafter, only differences from the embodiment of FIGS. 1 and 2 will be described.
In this modified example, as shown in FIGS. 3 and 4, connection points 14 a to 14 f for voltage measurement are not provided. Further, the calculation processing unit 31 is not provided with the output voltage value calculation unit 31b.

For this reason, the A / D conversion unit 31a digitally converts only the analog current signals from the current detection elements 13a and 13c and outputs them to the output current value calculation unit 31c. Further, the remaining capacity calculation unit 31d replaces the voltages Vac, Vab, Vbc calculated by the output voltage value calculation unit 31b with the rated voltage values 200V, 100V, 100V of each power supply specification 1-3 acquired from the storage unit. Is used. Therefore, in the present modification, the storage unit functions as an output voltage value calculation unit.
Thus, instead of measuring the voltage, the wiring and processing can be simplified by using the rated voltage value.

(Second Embodiment)
Next, with reference to FIG.5 and FIG.6, the structure of the AC generator by 2nd Embodiment of this invention is demonstrated. Hereinafter, differences from the first embodiment will be mainly described.
The generator 2 of the present embodiment includes a three-phase winding 110 that is an armature winding wound around a stator, a field winding (not shown) wound around a rotor, and a wiring interruption. And 120 and 124, and a control board 130.

  The generator 2 of the present embodiment is configured to be able to supply power to the load with two power supply specifications 1 and 2. The power supply specifications 1 and 2 can be used alone or both at the same time. The power supply specification 1 is a three-phase AC output with a rated output of 20 kVA, a rated current of 58 A, and a rated voltage of 200 V, and a load is connected between the three-phase output terminals U-V-W. The power supply specification 2 is a single-phase AC output with a rated output of 5.8 kVA, a rated current of 58 A, and a rated voltage of 100 V, and is connected between the single-phase output terminals R1 and R2.

  The three-phase winding 110 is configured by star-connecting the winding start ends of windings 110a, 110b, and 110c having the same number of turns at a neutral point O. In the three-phase winding 110, terminals Td, Te, and Tf, which are winding ends of the respective windings 110a, 110b, and 110c, are connected to output terminals U, V, and W by wirings 112a, 112b, and 112c, respectively.

  Further, a connection point Tg is provided at a position of a predetermined number of turns closer to the neutral point O of the winding 110b, and the connection point Tg and the single-phase output terminal R2 are connected by a wiring 112e. Further, the terminal Te and the terminal R1 are connected by the wiring 112d. Thereby, 110 d of winding parts between terminal Te-Tg among windings 110b are used for a single phase output as a common winding part or a single phase winding part. Therefore, when a three-phase AC output and a single-phase AC output are used at the same time, a current flows superimposed on the common winding portion 110d.

FIG. 5 shows the relationship between voltages generated in the windings 110a, 110b, 110c, and 110d (referred to as Va, Vb, Vc, and Vd, respectively) when the generator 2 is driven.
In the present embodiment, alternating currents flowing through the wirings 112a to 112e are referred to as currents Ia to Ie, respectively.

In this embodiment, due to the rotation of the rotor (not shown), the three-phase AC voltages V _UV and V _{VW of} 200 V (effective value) are applied between the output terminals U-V, V-W, and W-U. , V _WU is generated, and a single-phase AC voltage V _R1-R2 of 100 V (effective value) is generated between the output terminals R1-R2.

  Current detection elements (CT in this example) 113c and 113e are disposed on the wirings 112c and 112e, respectively. Further, connection points for voltage measurement are provided on the wirings 112b, 112c, 112d, and 112e. Specifically, connection points 114a, 114b, 114c, and 114d are provided on the wirings 112b, 112c, 112d, and 112e, respectively.

The circuit breaker 120 for wiring is provided in the wiring 112a-112c for three-phase alternating current output. The circuit breaker 120 for wiring is provided with the interruption | blocking part 121a, 121b, 121c each provided in wiring 112a, 112b, 112c, and the operating device 122 which operates these.
Moreover, the circuit breaker 124 for wiring is provided in the wiring 112d and 112e for single phase alternating current outputs. The circuit breaker 124 for wiring is provided with circuit breakers 125a and 125b provided in the wirings 112d and 112e, respectively, and an operating device 126 for operating them.
The circuit breakers 120 and 124 for wiring are the same in configuration and operation as the circuit breaker 20 of the first embodiment.

  The control board 130 includes an arithmetic processing unit 131, a circuit breaker circuit breaker 132, a remaining capacity display selection switch 133, and a remaining capacity display device 134.

  The arithmetic processing unit 131 includes an A / D conversion unit 131a, an output voltage value calculation unit 131b, an output current value calculation unit 131c, a remaining capacity calculation unit 131d, a remaining capacity display selection unit 131e, and a cutoff determination unit 131f. It has.

Based on the digital voltage signal received from the A / D conversion unit 131a, the output voltage value calculation unit 131b determines the voltage V _VW (voltage of power supply specification 1) between the connection points 114a to 114b and the voltage between the connection points 114c to 114d. Calculate V _R1-R2 (voltage of power supply specification 2). In the present embodiment, the calculated voltage V _VW is assumed to be equal to the magnitudes of the other interphase voltages V _UV and V _WU . The voltages V _UV and V _WU may be separately measured and calculated.
The output current value calculation unit 131c calculates currents Ic and Ie flowing through the wirings 112c and 112e based on the digital current signal received from the A / D conversion unit 131a. In this embodiment, the calculated current Ic is assumed to be equal to the currents Ia and Ib, and the calculated current Ie is assumed to be equal to the current Id. The currents Ia, Ib, and Id may be separately measured and calculated.

Next, the operation of the generator 2 of this embodiment will be described.
First, the remaining capacity calculation process performed by the generator 2 will be described.
As an operation example 1 of the remaining capacity calculation process, an example in which the power supply specification 1 (three-phase AC output) is used will be described. The operation example 1 is an example of processing when a device (rated power 10 kVA, rated current 29 A, rated voltage 200 V) is connected between the output terminals U-V-W.

In the operation example 1, it is assumed that the voltage V _VW calculated by the output voltage value calculation unit 131b is 200V, and the voltage V _R1-R2 is 100V. Further, it is assumed that the current Ic calculated by the output current value calculation unit 131c is 29A and the current Ie is 0A. In addition, since the sum current (Ic + Ie) of the current Ic and the current Ie flows through the common winding portion 110d, a common winding current of 29A (= 29 + 0) flows.

The remaining capacity calculator 131d receives the voltage value and the current value calculated from the output voltage value calculator 131b and the output current value calculator 131c, and calculates the virtual power consumption based on these data as follows.
Virtual power consumption S _UVW [kVA] (= V × I) for power supply specification 1 (between output terminals U and V-W) is voltage V (voltage V _VW ), current I (current I is current Ic and current I It is calculated by multiplying the sum current of Ie, that is, the common winding current, and a constant (square root of 3 = √3). Here, it is calculated as 10 kVA (= 200 V × (29 + 0) A × √3).

Virtual power consumption S _R [kVA] (= V × I) for power supply specification 2 (between output terminals R1 and R2) is voltage V (voltage V _{R1 -R2} ) and current I (current I is current Ic and current I It is calculated by multiplying the sum current of Ie, that is, the common winding current. Here, it is calculated as 2.9 kVA (= 100 V × (29 + 0) A).

Furthermore, the remaining capacity calculation unit 131d calculates the remaining capacity of each power supply specification. The remaining capacity of each power supply specification is calculated by subtracting virtual power usage from each rated output.
Here, the remaining capacity [kVA] for the power supply specification 1 is calculated as 10 kVA (= 20−10) by the remaining capacity calculation unit 131d. The remaining capacity [kVA] for the power supply specification 2 is calculated as 2.9 kVA (= 5.8-2.9).

  Next, as an operation example 2, an example in which the power supply specification 1 and the power supply specification 2 are used will be described. In Operation Example 2, a device (rated power 8.7 kVA, rated current 25 A, rated voltage 200 V) is connected between the output terminals U-V-W, and a device (rated power 2 kVA, rated current 20 A) is connected between the output terminals R1 and R2. , Rated voltage 100V) is an example of processing when connected.

In the operation example 2, it is assumed that the voltage V _VW calculated by the output voltage value calculation unit 131b is 200V, and the voltage V _R1-R2 is 100V. Further, it is assumed that the current Ic calculated by the output current value calculation unit 131c is 25A and the current Ie is 20A. In addition, since the sum current (Ic + Ie) of the current Ic and the current Ie flows through the common winding portion 110d, a common winding current of 45A (= 25 + 20) flows.

The remaining capacity calculation unit 131d calculates the virtual power consumption based on these data in the same manner as in the first operation example.
The virtual power consumption S _UVW for the power supply specification 1 is calculated as 15.6 kVA (= 200 V × (25 + 20) A × √3). The virtual power S _R for the power supply specification 2 is calculated as 4.5 kVA (= 100 V × (25 + 20) A).

Further, the remaining capacity calculation unit 131d calculates the remaining capacity of each power supply specification as in the first operation example.
The remaining capacity for the power supply specification 1 is calculated as 4.4 kVA (= 20-15.6). The remaining capacity for the power supply specification 2 is calculated as 1.3 kVA (= 5.8−4.5).

  Next, as an operation example 3, an example in which the power supply specification 2 is used is shown. The operation example 3 is an example of processing when a device (rated power 4.5 kVA, rated current 45 A, rated voltage 100 V) is connected between the output terminals R1 and R2.

In the operation example 3, it is assumed that the voltage V _VW calculated by the output voltage value calculation unit 131b is 200V, and the voltage V _R1-R2 is 100V. Further, it is assumed that the current Ic calculated by the output current value calculation unit 131c is 0A and the current Ie is 45A. In addition, since the sum current (Ic + Ie) of the current Ic and the current Ie flows through the common winding portion 110d, a common winding current of 45A (= 0 + 45) flows.

The remaining capacity calculation unit 131d calculates the virtual power consumption based on these data in the same manner as in the first and second operation examples.
The virtual power consumption S _UVW for the power supply specification 1 is calculated as 15.6 kVA (= 200 V × (0 + 45) A × √3). Virtual power used S _R of the power supply specifications 2, 4.5kVA (= 100V × (0 + 45) A) to be computed.

Further, the remaining capacity calculation unit 131d calculates the remaining capacity of each power supply specification as in the first and second operation examples.
The remaining capacity for the power supply specification 1 is calculated as 4.4 kVA (= 20-15.6). The remaining capacity for the power supply specification 2 is calculated as 1.3 kVA (= 5.8−4.5).

  In the present embodiment as well, a method of calculating the remaining capacity from the virtual power consumption is employed in the same manner as in the first embodiment in order to simplify the arithmetic processing. In the present embodiment, the remaining capacity of each power supply specification is calculated based on a margin (allowable current) from the current flowing through the common winding portion 110d to each rated current value. However, the present invention is not limited to this, and the remaining capacity of each power supply specification may be calculated directly from the allowable current without using virtual power.

Next, display processing of the remaining capacity of each power supply specification calculated as described above will be described. This process is also repeated every predetermined time.
In the present embodiment, the remaining capacity display selection switch 133 is configured by a switch capable of selecting the power supply specification 1 or 2, and a selection signal is output according to the selection position of the switch. Based on the selection signal, the remaining capacity display selection unit 131e drives the remaining capacity display device 134 so as to display the selected output format and the remaining capacity.

  As shown in FIG. 5, the remaining capacity display device 134 includes a remaining capacity display section 134a on the upper side and a power specification display section 134b on the lower side. The power supply specification display part 134b has an LED indicated by the “three-phase output 200V” display on the left side corresponding to the power supply specification 1 and a “single-phase output 100V” display on the right side corresponding to the power supply specification 2. With the LEDs shown.

  The remaining capacity display device 134 displays the power specification selected by the remaining capacity display selection unit 131e and the remaining capacity on the power specification display unit 134b and the remaining capacity display unit 134a, respectively.

Next, the interruption process for operating the circuit breakers 120 and 124 for wiring will be described. This process is also repeated every predetermined time.
The interruption determination unit 131f calculates a winding current flowing through the three-phase winding 110 and a common winding current flowing through the common winding portion 110d from the currents Ic and Ie calculated by the output current value calculation unit 131c. The common winding current is given by the sum of the currents Ic and Ie. The cutoff determination unit 131f compares the winding current and the common winding current with the rated current value of each power supply specification.

  Similarly to the first embodiment, the cutoff determination unit 131f calculates a current load factor (= current value / rated current value) for each power supply specification, and stores the cutoff rate in the cutoff standby time table according to the load factor. Based on this, a cutoff standby time is set, and the cutoff standby time is counted. When the shutdown standby time for any one of the power supply specifications has elapsed, the shutdown determination unit 131f outputs a determination signal instructing the shutdown of the wiring corresponding to the power supply specification to the wiring circuit breaker cutoff unit 132.

  When the circuit breaker breaker 132 for wiring receives a determination signal instructing breakage, it outputs an operation signal to the circuit breakers 120 and 124 for wiring, and drives the circuit breakers 120 and 124 for wiring to a breaker state. In this embodiment, when an excessive current flows, the corresponding circuit breakers 120 and 124 are configured to operate. However, the present invention is not limited to this, and both the circuit breakers 120 and 124 are connected. You may comprise so that it may interrupt | block.

Next, a modified example of the generator 2 of the second embodiment is shown in FIGS. In the following, only differences from the embodiment of FIGS. 5 and 6 will be described.
In this modified example, as shown in FIGS. 7 and 8, connection points 114 a to 114 d for voltage measurement are not provided. Further, the calculation processing unit 131 is not provided with the output voltage value calculation unit 131b.

For this reason, the A / D conversion unit 131a digitally converts only the analog current signals from the current detection elements 113c and 113e and outputs them to the output current value calculation unit 131c. In addition, the remaining capacity calculation unit 131d replaces the voltages V _VW and V _R1-R2 calculated by the output voltage value calculation unit 131b with the rated voltage values 200V and 100V of the power supply specifications 1 and 2 acquired from the storage unit. Is used. Therefore, in the present modification, the storage unit functions as an output voltage value calculation unit. Thus, instead of measuring the voltage, the wiring and processing can be simplified by using the rated voltage value.

(Third embodiment)
Next, with reference to FIG.9 and FIG.10, the structure of the alternating current generator by 3rd Embodiment of this invention is demonstrated. Hereinafter, differences from the first embodiment and the second embodiment will be mainly described.
The generator 3 of this embodiment includes a three-phase winding 210 that is an armature winding wound around a stator, a field winding (not shown) wound around a rotor, and a wiring breaker. Devices 220 and 224, and a control board 230.

  The generator 3 of the present embodiment is configured to be able to supply power to a load with four power supply specifications 1-4. The power supply specifications 1-4 can be used alone or in any combination. The power supply specification 1 is a three-phase AC output with a rated output of 20 kVA, a rated current of 58 A, and a rated voltage of 200 V, and a load is connected between the three-phase output terminals U-V-W. The power supply specification 2 is a single-phase AC output having a rated output of 11.6 kVA, a rated current of 58 A, and a rated voltage of 200 V, and is connected between the single-phase output terminals L1 and L2. The power supply specifications 3 and 4 are single-phase AC outputs with a rated output of 5.8 kVA, a rated current of 58 A, and a rated voltage of 100 V, respectively, and are connected between the single-phase output terminals L1-0 and L2-0, respectively.

  The three-phase winding 210 has a configuration in which the winding start ends of the windings 210a, 210b, and 210c having the same number of turns are star-connected at a neutral point O. In the three-phase winding 210, terminals Th, Ti, and Tj, which are winding ends of the windings 210a, 210b, and 210c, are connected to output terminals U, V, and W through wirings 212a, 212b, and 212c, respectively.

  Further, connection points Tk and Tl are provided at positions corresponding to a predetermined number of turns from the winding start ends of the windings 210a and 210c, respectively, and branch windings 210e and 210f having the same number of turns are connected to the connection points Tk and Tl. It is wound in an electrically symmetrical phase direction with respect to the winding 210b. Among the windings 210a and 210c, the portions from the winding start end to the connection points Tk and Tl are defined as common winding portions 210g and 210h, respectively. The common winding portion 210g and the branch winding 210e, and the common winding portion 210h and the branch winding 210f form a single-phase winding portion, respectively.

  In the present embodiment, the connection points Tk and Tl are provided at intermediate points of the windings 210a and 210c, respectively, and divide the number of turns into two. Further, the number of turns of the common winding portions 210g and 210h and the number of turns of the branch windings 210e and 210f are all set equal. Further, the branch windings 210e and 210f are wound so as to be electrically opposite in phase to the windings 210c and 210a, respectively.

  In the present embodiment, the terminals Tm and Tn that are the winding ends of the branch windings 210e and 210f are connected to the single-phase output terminals L1 and L2 by wirings 212d and 212f, respectively. Further, the neutral point O is connected to the single-phase output terminal O by the wiring 212e.

FIG. 9 shows the relationship between the voltages generated in the windings 210a-210f (respectively Va-Vf) when the generator 3 is driven.
In the present embodiment, alternating currents flowing through the wirings 212a to 212f are referred to as currents Ia and If, respectively.

In this embodiment, due to the rotation of the rotor (not shown), the three-phase AC voltages V _UV and V _{VW of} 200 V (effective value) are applied between the output terminals U-V, V-W, and W-U. , V _WU is generated, 200 V (effective value) single-phase AC voltage V _L1 -L2 is generated between the output terminals L1 and L2, and 100 V (effective value) is generated between the output terminals L1-0 and L2 -O. ) Single-phase AC voltages V _L1-O and V _L2-O are generated.

  Current detection elements (CT in this example) 213c, 213d, and 213f are arranged on the wirings 212c, 212d, and 212f, respectively. Furthermore, connection points for voltage measurement are provided in the wirings 212b, 212c, 212d, 212e, and 212f. Specifically, connection points 214a and 214b are provided for the wirings 212b and 212c, connection points 214c and 214g are provided for the wiring 212d, connection points 214d and 214e are provided for the wiring 212e, and wiring 212f is provided for the wiring 212f. Connection points 214f and 214h are provided.

The circuit breaker 220 for wiring is provided in the wiring 212a-212c for three-phase alternating current output. The circuit breaker 220 for wiring is equipped with the interruption | blocking part 221a, 221b, 221c provided in wiring 212a, 212b, 212c, respectively, and the operating device 222 which operates these.
Moreover, the circuit breaker 224 for wiring is provided in the wiring 212d and 212f for single-phase alternating current outputs. The circuit breaker 224 for wiring is provided with circuit breakers 225a and 225b provided on the wirings 212d and 212f, respectively, and an actuating device 226 for operating them.
The circuit breakers 220 and 224 for wiring are similar in configuration and operation to the circuit breakers 120 and 124 for wiring according to the second embodiment.

  The control board 230 includes an arithmetic processing unit 231, a circuit breaker circuit breaker 232, a remaining capacity display selection switch 233, and a remaining capacity display device 234.

  The arithmetic processing unit 231 includes an A / D conversion unit 231a, an output voltage value calculation unit 231b, an output current value calculation unit 231c, a remaining capacity calculation unit 231d, a remaining capacity display selection unit 231e, and a cutoff determination unit 231f. It has.

Based on the digital voltage signal received from the A / D conversion unit 231a, the output voltage value calculation unit 231b determines the voltage V _VW (voltage of power supply specification 1) between the connection points 214a-214b and the voltage between the connection points 214c-214d. V _L1-O (voltage of power supply specification 3), voltage V _L2-O (voltage of power supply specification 4) between connection points 214e-214f, voltage V _L1-L2 (voltage of power supply specification 2) between connection points 214g-214h ) Is calculated. In the present embodiment, the calculated voltage V _VW is assumed to be equal to the magnitudes of the other interphase voltages V _UV and V _WU . The voltages V _UV and V _WU may be separately measured and calculated.

  The output current value calculation unit 231c calculates currents Ic, Id, If flowing through the wirings 212c, 212d, 212f based on the digital current signal received from the A / D conversion unit 231a. In the present embodiment, the calculated current Ic is assumed to be equal to the currents Ia and Ib. Note that the currents Ia and Ib may be separately measured and calculated.

Next, the operation of the generator 3 of this embodiment will be described.
First, the remaining capacity calculation process performed by the generator 3 will be described.
As an operation example 1 of the remaining capacity calculation process, an example in which the power supply specification 1 (three-phase AC output) is used will be described. The operation example 1 is an example of processing when a device (rated power 10 kVA, rated current 29 A, rated voltage 200 V) is connected between the output terminals U-V-W.

In the operation example 1, it is assumed that the voltage V _VW calculated by the output voltage value calculation unit 231b is 200V, the voltage V _L1-O is 100V, the voltage V _L2-O is 100V, and the voltage V _L1-L2 is 200V. Further, it is assumed that the current Ic calculated by the output current value calculation unit 231c is 29A, the current Id is 0A, and the current If is 0A. In addition, since the sum current (Ic + Id) of the current Ic and the current Id and the sum current (Ic + If) of the current Ic and the current If flow through the common winding portions 210g and 210h, respectively, 29A (= 29 + 0) and 29A (= 29 + 0) common winding current flows.

The remaining capacity calculation unit 231d receives the voltage value and current value calculated from the output voltage value calculation unit 231b and the output current value calculation unit 231c, and calculates the virtual power consumption based on these data as follows.
Virtual power consumption S _UVW [kVA] (= V × I) for power supply specification 1 (between output terminals U-V-W) is voltage V (voltage V _VW ), current I (current I is current Ic, The sum is calculated by multiplying the sum of the currents Id and If with the larger one, that is, the larger common winding current, and a constant (square root of 3 = √3). Here, it is calculated as 10 kVA (= 200 V × (29 + 0) A × √3).

Virtual power consumption S _L1-L2 [kVA] (= V × I) for power supply specification 2 (between output terminals L1 and L2) is voltage V (voltage V _{L1 -L2} ) and current I (current I is current Ic And the sum of the larger currents Id and If, that is, the larger one of the common winding currents). Here, it is calculated as 5.8 kVA (= 200 V × (29 + 0) A).

Virtual power consumption S _L1-O [kVA] (= V × I) for power supply specification 3 (between output terminals L1 and O) is a voltage V (voltage V _{L1 -O} ) and a current I (current I is current Ic). And the sum of the currents Id, that is, the common winding current). Here, it is calculated as 2.9 kVA (= 100 V × 29 A).
Virtual power consumption S _L2-O [kVA] (= V × I) for power supply specification 4 (between output terminals L2 and O) is voltage V (voltage V _{L2 -O} ) and current I (current I is current Ic And the sum of the current If, that is, the common winding current). Here, it is calculated as 2.9 kVA (= 100 V × 29 A).

Furthermore, the remaining capacity calculation unit 231d calculates the remaining capacity of each power supply specification. The remaining capacity of each power supply specification is calculated by subtracting virtual power usage from each rated output.
Here, the remaining capacity [kVA] for the power supply specification 1 is calculated as 10 kVA (= 20−10) by the remaining capacity calculation unit 231d. The remaining capacity [kVA] for the power supply specification 2 is calculated as 5.8 kVA (= 11.6−5.8). The remaining capacity [kVA] for the power supply specification 3 is calculated as 2.9 kVA (= 5.8-2.9). The remaining capacity [kVA] for the power supply specification 4 is calculated as 2.9 kVA (= 5.8-2.9).

  Next, as an operation example 2, an example in which the power supply specification 1 and the power supply specification 2 are used will be described. In Operation Example 2, a device (rated power 8.7 kVA, rated current 25 A, rated voltage 200 V) is connected between the output terminals U-V-W, and a device (rated power 4 kVA, rated current 20 A) is connected between the output terminals L1 and L2. , Rated voltage 200V) is an example of processing when connected.

In the operation example 2, it is assumed that the voltage V _VW calculated by the output voltage value calculation unit 231b is 200V, the voltage V _L1-O is 100V, the voltage V _L2-O is 100V, and the voltage V _L1-L2 is 200V. Further, it is assumed that the current Ic calculated by the output current value calculation unit 231c is 25A, the current Id is 20A, and the current If is 20A. In addition, since the sum current (Ic + Id) of the current Ic and the current Id and the sum current (Ic + If) of the current Ic and the current If flow through the common winding portions 210g and 210h, respectively, 45A (= 25 + 20) and 45A (= 25 + 20) common winding current flows.

The remaining capacity calculation unit 231d calculates virtual power consumption based on these data in the same manner as in the first operation example.
The virtual power consumption S _UVW for the power supply specification 1 is calculated as 15.6 kVA (= 200 V × (25 + 20) A × √3). The virtual power consumption S _L1-L2 for power supply specification 2 is calculated as 9 kVA (= 200 V × (25 + 20) A). The virtual power consumption S _L1-O for the power supply specification 3 is calculated as 4.5 kVA (= 100 V × (25 + 20) A). The virtual power consumption S _L2-O for the power supply specification 4 is calculated as 4.5 kVA (= 100 V × (25 + 20) A).

Further, the remaining capacity calculation unit 231d calculates the remaining capacity of each power supply specification as in the first operation example.
The remaining capacity for the power supply specification 1 is calculated as 4.4 kVA (= 20-15.6). The remaining capacity for the power supply specification 2 is calculated as 2.6 kVA (= 11.6-9). The remaining capacity for the power supply specification 3 is calculated as 1.3 kVA (= 5.8−4.5). The remaining capacity for the power supply specification 4 is calculated as 1.3 kVA (= 5.8−4.5).

  Next, as operation example 3, an example in which power supply specification 1 and power supply specification 3 are used will be described. In Operation Example 3, a device (rated power 6.9 kVA, rated current 20 A, rated voltage 200 V) is connected between the output terminals U-V-W, and a device (rated power 5 kVA, rated current 25 A) is connected between the output terminals L 1 -O. , Rated voltage 100V) is an example of processing when connected.

In the operation example 3, it is assumed that the voltage V _VW calculated by the output voltage value calculation unit 231b is 200V, the voltage V _L1-O is 100V, the voltage V _L2-O is 100V, and the voltage V _L1-L2 is 200V. Further, it is assumed that the current Ic calculated by the output current value calculation unit 231c is 20A, the current Id is 25A, and the current If is 0A. In addition, since the sum current (Ic + Id) of the current Ic and the current Id and the sum current (Ic + If) of the current Ic and the current If flow through the common winding portions 210g and 210h, respectively, 45A (= 20 + 25) and 20A (= 20 + 0) common winding current flows.

The remaining capacity calculation unit 231d calculates the virtual power consumption based on these data as in the first and second operation examples.
The virtual power consumption S _UVW for the power supply specification 1 is calculated as 15.6 kVA (= 200 V × (20 + 25) A × √3). The virtual power consumption S _L1-L2 for the power supply specification 2 is calculated as 9 kVA (= 200 V × (20 + 25) A). The virtual power consumption S _L1-O for the power supply specification 3 is calculated as 4.5 kVA (= 100 V × (20 + 25) A). The virtual power consumption S _L2-O for the power supply specification 4 is calculated as 2 kVA (= 100 V × (20 + 0) A).

Further, the remaining capacity calculation unit 231d calculates the remaining capacity of each power supply specification as in the first and second operation examples.
The remaining capacity for the power supply specification 1 is calculated as 4.4 kVA (= 20-15.6). The remaining capacity for the power supply specification 2 is calculated as 2.6 kVA (= 11.6-9). The remaining capacity for the power supply specification 3 is calculated as 1.3 kVA (= 5.8−4.5). The remaining capacity for the power supply specification 4 is calculated as 3.8 kVA (= 5.8-2).

  Next, as an operation example 4, an example in which the power supply specification 1, the power supply specification 2 and the power supply specification 4 are used will be described. In Operation Example 4, a device (rated power 3.5 kVA, rated current 10 A, rated voltage 200 V) is connected between the output terminals U-V-W, and a device (rated power 2 kVA, rated current 10 A) is connected between the output terminals L1 and L2. , Rated voltage 200V), and an example of processing when a device (rated power 3 kVA, rated current 30A, rated voltage 100V) is connected between the output terminals L2-O.

In the operation example 4, it is assumed that the voltage V _VW calculated by the output voltage value calculation unit 231b is 200V, the voltage V _L1-O is 100V, the voltage V _L2-O is 100V, and the voltage V _L1-L2 is 200V. Further, it is assumed that the current Ic calculated by the output current value calculation unit 231c is 10A, the current Id is 10A, and the current If is 40A on which the current Id is superimposed. In addition, since the sum current (Ic + Id) of the current Ic and the current Id and the sum current (Ic + If) of the current If superimposed on the current Ic and the current Id flow in the common winding portions 210g and 210h, respectively, 20A A common winding current of (= 10 + 10) and 50A (= 10 + 40) flows.

The remaining capacity calculation unit 231d calculates the virtual power usage based on these data in the same manner as in Operation Example 1-3.
The virtual power consumption S _UVW for the power supply specification 1 is calculated as 17.3 kVA (= 200 V × (10 + 40) A × √3). The virtual power consumption S _L1-L2 for power supply specification 2 is calculated as 10 kVA (= 200 V × (10 + 40) A). The virtual power consumption S _L1-O for the power supply specification 3 is calculated as 2 kVA (= 100 V × (10 + 10) A). The virtual power consumption S _L2-O for the power supply specification 4 is calculated as 5 kVA (= 100 V × (10 + 40) A).

Further, the remaining capacity calculation unit 231d calculates the remaining capacity of each power supply specification as in the first and second operation examples.
The remaining capacity for power supply specification 1 is calculated as 2.7 kVA (= 20-17.3). The remaining capacity for power supply specification 2 is calculated as 1.6 kVA (= 11.6-10). The remaining capacity for the power supply specification 3 is calculated as 3.8 kVA (= 5.8-2). The remaining capacity for the power supply specification 4 is calculated as 0.8 kVA (= 5.8-5).

  Next, as operation examples 5 and 6, as in the operation example 2, an example in which the power supply specification 1 and the power supply specification 2 are used will be described. In the operation examples 5 and 6, similarly to the operation example 2, devices (rated power 8.7 kVA, rated current 25 A, rated voltage 200 V) are connected between the output terminals U-V-W, and between the output terminals L1 and L2. It is an example of processing when equipment (rated power 4 kVA, rated current 20 A, rated voltage 200 V) is connected. However, the operation example 5 is a case where the calculated voltage value is higher than the rated value, and the operation example 6 is a case where the calculated voltage value is lower than the rated value.

In the operation example 5, the voltage V _VW calculated by the output voltage value calculation unit 231b is 220V (> 200V), the voltage V _L1-O is 110V (> 100V), the voltage V _L2-O is 106V (> 100V), the voltage Assume that V _L1-L2 is 216 V (> 200 V). Further, it is assumed that the current Ic calculated by the output current value calculation unit 231c is 25A, the current Id is 20A, and the current If is 20A.

  The remaining capacity calculation unit 231d calculates the virtual power consumption based on these data in the same manner as in the second operation example. However, the remaining capacity calculation unit 231d calculates the virtual power consumption using the larger voltage value of the rated voltage and the measured voltage (the voltage calculated by the output voltage value calculation unit 231b) in each power supply specification. It is configured.

The virtual power consumption S _UVW for the power supply specification 1 is calculated as 17.1 kVA (= 220 V × (25 + 20) A × √3). The virtual power usage S _L1-L2 for power supply specification 2 is calculated as 9.7 kVA (= 216 V × (25 + 20) A). The virtual power consumption S _L1-O for the power supply specification 3 is calculated as 5 kVA (= 110 V × (25 + 20) A). The virtual power consumption S _L2-O for the power supply specification 4 is calculated as 4.8 kVA (= 106 V × (25 + 20) A).

Further, the remaining capacity calculation unit 231d calculates the remaining capacity of each power supply specification as in the second operation example.
The remaining capacity for the power supply specification 1 is calculated as 2.9 kVA (= 20-17.1). The remaining capacity for the power supply specification 2 is calculated as 1.9 kVA (= 11.6−9.7). The remaining capacity for the power supply specification 3 is calculated as 0.8 kVA (= 5.8-5). The remaining capacity for the power supply specification 4 is calculated as 1 kVA (= 5.8-4.8). The remaining capacity calculated in the operation example 5 is smaller than that in the operation example 2.
By using the measured voltage when the measured voltage is larger than the rated voltage as in the operation example 5, it is possible to avoid the user from exceeding the rated output of the generator.

In the operation example 6, the voltage V _VW calculated by the output voltage value calculation unit 231b is 190V (<200V), the voltage V _L1-O is 95V (<100V), the voltage V _L2-O is 90V (<100V), the voltage Assume that V _L1 -L2 is 185 V (<200 V). Further, it is assumed that the current Ic calculated by the output current value calculation unit 231c is 25A, the current Id is 20A, and the current If is 20A.

  The remaining capacity calculation unit 231d calculates the virtual power consumption based on these data in the same manner as in the second operation example. However, similarly to the operation example 5, the remaining capacity calculation unit 231d uses the larger voltage value of the rated voltage and the measured voltage (the voltage calculated by the output voltage value calculation unit 231b) in each power supply specification. The power consumption is calculated.

The virtual power consumption S _UVW for the power supply specification 1 is calculated as 15.6 kVA (= 200 V × (25 + 20) A × √3). The virtual power consumption S _L1-L2 for power supply specification 2 is calculated as 9 kVA (= 200 V × (25 + 20) A). The virtual power consumption S _L1-O for the power supply specification 3 is calculated as 4.5 kVA (= 100 V × (25 + 20) A). The virtual power consumption S _L2-O for the power supply specification 4 is calculated as 4.5 kVA (= 100 V × (25 + 20) A).

Further, the remaining capacity calculation unit 231d calculates the remaining capacity of each power supply specification as in the second operation example.
The remaining capacity for the power supply specification 1 is calculated as 4.4 kVA (= 20-15.6). The remaining capacity for the power supply specification 2 is calculated as 2.6 kVA (= 11.6-9). The remaining capacity for the power supply specification 3 is calculated as 1.3 kVA (= 5.8−4.5). The remaining capacity for the power supply specification 4 is calculated as 1.3 kVA (= 5.8−4.5). The remaining capacity calculated in the operation example 6 is equal to that in the operation example 2.
By using the rated voltage when the measured voltage is smaller than the rated voltage as in the operation example 6, it is possible to avoid the use exceeding the maximum value (rated current) of the line current.

  In this embodiment as well, a method of calculating the remaining capacity from the virtual power consumption is adopted to simplify the calculation process. In this embodiment, the remaining capacity of each power supply specification is calculated based on the margin (allowable current) from the current flowing through the common winding portions 210g and 210h to each rated current value. However, the present invention is not limited to this, and the remaining capacity of each power supply specification may be calculated directly from the allowable current without using virtual power.

  In the first embodiment and the second embodiment, as in the operation examples 5 and 6 of the third embodiment, the larger one of the measured voltage and the rated voltage can be used as a voltage value for the calculation.

Next, display processing of the remaining capacity of each power supply specification calculated as described above will be described. This process is also repeated every predetermined time.
In the present embodiment, the remaining capacity display selection switch 233 is configured by a switch that can select any one of the power supply specifications 1-4, and a selection signal is output according to the selection position of the switch. Based on the selection signal, the remaining capacity display selection unit 231e drives the remaining capacity display device 234 to display the selected output format and the remaining capacity.

  As shown in FIG. 9, the remaining capacity display device 234 includes a remaining capacity display unit 234a on the upper side and a power specification display unit 234b on the lower side. The power supply specification display unit 234b corresponds to the power supply specification 1 indicated by the "three-phase output 200V" display on the left side and the power supply specification 2 indicated by the "200V" display on the right side. LED corresponding to power supply specification 3 indicated by “100V” display on the “L1” display side, and LED corresponding to power supply specification 4 indicated by “100V” display on the “L2” display side I have.

  The remaining capacity display device 234 displays the power supply specification selected by the remaining capacity display selection unit 231e and the remaining capacity on the power supply specification display unit 234b and the remaining capacity display unit 234a, respectively.

Next, the interruption process for operating the circuit breakers 220 and 224 for wiring will be described. This process is also repeated every predetermined time.
The interruption determining unit 231f includes a winding current flowing through the three-phase winding 210 from the currents Ic, Id, If calculated by the output current value calculating unit 231c and each single-phase winding unit (branch winding 210e, winding 210g, winding The winding current flowing through the combination of the line 210h and the branch winding 210f, the combination of the winding 210g and the branch winding 210e, and the combination of the winding 210h and the branch winding 210f is calculated. The winding current flowing through the three-phase winding 210 is given by the sum of the current Ic and the larger of the currents Id and If, and the winding flowing through the single-phase winding portion (windings 210e, 210g, 210h, 210f). The line current is given by the sum of the current Ic and the larger of the currents Id and If, and the winding current flowing through the other single-phase windings is the sum of the current Ic and the current Id, the current Ic, It is given by the sum current of the current If. The interruption determination unit 231f compares these winding currents with the rated current values of the respective power supply specifications.

  As in the first embodiment and the second embodiment, the cutoff determination unit 231f calculates a current load factor (= current value / rated current value) for each power supply specification, and according to the load factor, Based on the blocking standby time table, the blocking standby time is set and the blocking standby time is counted. When the shutdown standby time for any one of the power supply specifications has elapsed, the shutdown determination unit 231f outputs a determination signal instructing the shutdown of the wiring corresponding to the power supply specification to the circuit breaker cutoff unit 232 for wiring.

  When the circuit breaker circuit breaker 232 receives the determination signal instructing the circuit breaker, the circuit breaker circuit 232 outputs an operation signal to the circuit breakers 220 and 224 to drive the circuit breakers 220 and 224 to the circuit breaker state. In this embodiment, when an excessive current flows, the corresponding circuit breakers 220 and 224 are configured to operate. However, the present invention is not limited thereto, and both the circuit breakers 220 and 224 are connected. You may comprise so that it may interrupt | block.

Next, FIGS. 11 and 12 show a modification of the generator 3 according to the third embodiment. In the following, only differences from the embodiment of FIGS. 9 and 10 will be described.
In this modified example, as shown in FIGS. 11 and 12, no connection points 214a to 214h for voltage measurement are provided. Further, the calculation processing unit 231 is not provided with the output voltage value calculation unit 231b.

For this reason, the A / D conversion unit 231a digitally converts only analog current signals from the current detection elements 213c, 213d, and 213f and outputs them to the output current value calculation unit 231c. In addition, the remaining capacity calculation unit 231d replaces the voltages V _VW , V _L1-O , V _L2-O , and V _L1-L2 calculated by the output voltage value calculation unit 231b with each power supply specification acquired from the storage unit. The rated voltage values of 1-4, 200V, 100V, 100V, and 200V are used. Therefore, in the present modification, the storage unit functions as an output voltage value calculation unit. Thus, instead of measuring the voltage, the wiring and processing can be simplified by using the rated voltage value.

  As described above, the generator 1-3 according to the present embodiment can be connected to a load with a plurality of power supply specifications, and the remaining amount of load that can be used in the current state in each power supply specification is displayed. 34, 134, 234 can be displayed. Thereby, in the generator of this embodiment, the user can confirm easily the power capacity which can be connected, before connecting load to an output terminal. Therefore, in the generator of the present embodiment, it is possible to prevent the user from connecting a load that would cause a capacity overload to the generator, and to avoid an overload of the generator. Furthermore, in the generator of this embodiment, by checking the remaining capacity, the user can select a load having an optimum capacity that is equal to or less than the remaining capacity, and the generator can be used efficiently.

  Moreover, in the generator 1-3 of this embodiment, even if it is a case where a user accidentally connects the load used as an overload to an output terminal, an excessive electric current will not continue flowing into an armature winding. Thus, it is comprised so that the circuit breaker for wiring may be operated so that wiring may be interrupted | blocked. As a result, when an overload is detected, the wiring is cut off, so that it is possible to prevent excessive current from continuing to flow through the armature winding and prevent burnout of the armature winding. Become.

  In the above embodiment, the remaining capacity display devices 34, 134, and 234 are configured to display only the remaining capacity of the power supply specifications selected by the remaining amount display selection switches 33, 133, and 233, respectively. In addition to this, a plurality of display units may be provided so as to display the remaining capacity of all power supply specifications. Furthermore, in the said embodiment, although the remaining capacity display parts 34a, 134a, and 234a were digital displays, it is not restricted to this, An analog display or a meter may be sufficient.

1, 2, 3 Generator 10 Single-phase winding 10a, 10b Common winding portion 20 Circuit breaker 30 Control board 34 Remaining capacity display device 110 Three-phase winding 110a, 110b, 110c Winding 110d Common winding portion 120 , 124 Wiring breaker 130 Control board 134 Remaining capacity display device 210 Three-phase winding 210a, 210b, 210c Winding 210e, 210f Branch winding 210g, 210h Common winding portion 220, 224 Wiring breaker 230 Control board 234 Remaining capacity display device

Claims (10)

Comprising an armature winding having a three-phase winding or a single-phase winding, and a single-phase winding portion including at least a part of the three-phase winding or the single-phase winding as a common winding portion, An AC generator that can extract power from the armature winding with multiple power supply specifications with different rated values,
An output current value calculation unit for calculating a current value output from the output terminal of the armature winding;
An output voltage value calculation unit that calculates or stores a voltage value for the output terminal of the armature winding, and in each power supply specification based on the current value and the voltage value, and a rated value of the plurality of power supply specifications. Furthermore, a remaining capacity calculation unit that calculates the remaining capacity of usable power,
An AC generator comprising: a remaining capacity display unit that displays a remaining capacity in each power supply specification.   The AC generator according to claim 1, wherein the rated value of the power supply specification is a rated current value, a rated voltage value, and a rated power value that are allowed when each power supply specification is used alone.   The armature winding can extract three-phase AC power and single-phase AC power from the three-phase winding and the single-phase winding portion, respectively, or the single-phase winding and the single-phase winding portion. The AC generator according to claim 1, wherein single-phase AC power having different rated values can be extracted from the AC generator.   4. The AC generator according to claim 1, wherein the output voltage value calculation unit calculates the voltage value based on a voltage measurement value of the output terminal. 5.   4. The AC generator according to claim 1, wherein the output voltage value calculation unit outputs a rated voltage value of each power supply specification as the voltage value. 5.   The remaining capacity calculation unit calculates a power consumption value in the plurality of power supply specifications based on the current value and the voltage value, and subtracts the power consumption value from a rated power value in the plurality of power supply specifications. The AC generator according to claim 1, wherein the remaining capacity is calculated. The remaining capacity calculation unit is further configured in each power supply specification based on the current value, the voltage value, and the rated value of the plurality of power supply specifications, based on the amount of current that can be further passed through the common winding portion. alternator according to any one of claims 1 to 5, characterized in that for calculating the remaining capacity of the available power.   The AC generator according to claim 1, wherein the remaining capacity display unit selectively displays a remaining capacity of each power supply specification.   The AC generator according to claim 1, wherein the remaining capacity display unit is a digital type or an analog type display. Based on the current value calculated by the output current value calculation unit, an interruption determination unit that outputs an operation signal when it is determined that a current of a predetermined value or more is flowing in the armature winding;
The wiring breaker which cuts off the connection between the output terminal and the load in response to the operation signal from the interruption determining unit, further comprising: a wiring breaker according to any one of claims 1 to 9. The described alternator.

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