JP6570261B2 - Single-phase three-wire distribution board - Google Patents

Description

  The present invention relates to a single-phase three-wire distribution board capable of accurately setting two voltage values, such as 100 V and 200 V, for the operating voltage of a branch breaker.

  The single-phase three-wire distribution board is a distribution board having a structure in which a branch breaker is connected to any two phases of three-phase bus bars connected to a secondary terminal of the main breaker. The three-phase bus bars are L1, L2, and N phases. If the branch breaker is connected to the L1 and L2 phases, the operating voltage will be 200V. If the branch breaker is connected to the L1 and N phases, When connected to the L2 phase and the N phase, the operating voltage is 100V. Since the operating voltage of each branch breaker can be switched by changing the connection phase in this way, a branch breaker having a operating voltage of 100V and a branch breaker having a 200V can be mixed in the same distribution board. .

  In recent years, as disclosed in Patent Document 1, a distribution board that attaches a current sensor to a primary side or a secondary side of a branch breaker and measures the power used by each branch circuit is becoming widespread. However, the electric power used differs depending on whether the operating voltage of the branch breaker to which the current sensor is attached is 100V or 200V. For this reason, it is necessary to input and set the operating voltage of each branch breaker individually for the operating power calculator.

  Therefore, as shown in Patent Document 2, the operating voltage of each branch breaker is set by switching the switch of the measurement unit for each branch breaker, and the power consumption is grasped from the set voltage and the current value measured by the current sensor. To be done.

  However, since it is necessary to set the voltage values of 100V and 200V for every branch breaker in advance, the setting work becomes complicated when the number of branches is large, and it is set to a voltage different from the actually used working voltage. There was also a risk of setting errors.

JP-A-6-165320 JP 2009-131008 A

  Accordingly, the object of the present invention is to solve the above-mentioned conventional problems, and it is not necessary to set the voltage by switching the measurement unit for each branch breaker, and a single-phase three-wire capable of accurately setting the operating voltage of each branch breaker. It is to provide a type distribution board.

The present invention made to solve the above problems is a single-phase three-wire distribution board in which branch breakers are connected to at least two of the three-phase bus bars connected to the secondary terminal of the main breaker. The bus bar includes at least two branch bars extending toward the primary terminal of each branch breaker, and each branch bar is provided with a current sensor, and each branch depends on whether or not a current is detected by each current sensor. The present invention is characterized in that a determination unit is provided for determining a breaker voltage electrode or a voltage to be used between the voltage electrode and the N phase .

As in claim 2, different types of current sensors can be arranged on the two branch bars extending toward the primary terminal of the same branch breaker. As in claim 3, the current sensor arranged on one branch bar is a current value measuring sensor for measuring a current value, and the current sensor arranged on the other branch bar is an energization detection sensor for detecting the presence or absence of energization. Can do.

In the single-phase three-wire distribution board of the present invention, each current sensor is disposed on at least two branch bars connected to the primary side terminal of each branch breaker, and each current sensor detects whether or not current is detected. Since it is the structure which provided the determination part which determines the use voltage in the voltage pole of a branch breaker or a voltage pole and N phase, the use voltage of each branch breaker can be determined automatically in a determination part. This eliminates the complexity of the voltage setting work and eliminates setting errors.

  Further, in the present invention, it is not necessary to measure the current value flowing through the two-phase branch bar, one is a current value measuring sensor capable of measuring the current value, and the other is an energization that does not require accuracy capable of detecting only the presence or absence of energization It can be a detection sensor. This can reduce the cost.

It is a perspective view which shows the electricity distribution panel of embodiment of this invention. It is a perspective view of the principal part. It is sectional drawing which shows the relationship between a bus-bar, a branch bar, and a branch breaker. It is a top view which shows the relationship between a bus-bar, a branch bar, and a branch breaker. It is sectional drawing which shows arrangement | positioning of a current sensor. It is a perspective view which shows other embodiment. It is a perspective view which shows the attachment state of a sensor block. It is sectional drawing of the principal part.

Embodiments of the present invention will be described below.
FIG. 1 is a perspective view showing a distribution board according to an embodiment of the present invention, wherein 1 is a main breaker, 2 is a branch breaker, and 3 is a determination unit. As in the prior art, a three-phase bus bar is connected to the secondary side of the main breaker 1.

  As shown in FIG. 2, in this embodiment, three-phase bus bars 4, 5, and 6 are stacked at a predetermined interval, and an N-phase bus bar 4 and an L1-phase bus bar 5 are sequentially arranged from the top of FIG. 2. , L2 phase bus bar 6. However, the arrangement of the bus bars is not limited to this embodiment, and can be changed upside down or in a triangular arrangement.

  Each bus bar 4, 5, 6 includes a branch bar 4 a, 5 a, 6 a extending toward the primary terminal 7 of each branch breaker 2. In this embodiment, all of the three-phase bus bars 4, 5, 6 are provided with branching bars 4a, 5a, 6a. However, the branching bars need only be formed on at least two-phase bus bars. In this embodiment, the branch bars are formed on both sides of the bus bar. However, when the branch breaker 2 is arranged only on one side of the bus bars 4, 5, 6, the branch bars 4a, 5a, 6a are also only on one side. What is necessary is just to form.

  As shown in FIG. 3, the primary terminal 7 of the branch breaker 2 is provided with three upper limit recesses into which these branch bars 4a, 5a, 6a are inserted, but the branch bar is only in two of these recesses. The terminal metal fitting 8 is arranged, and the working voltage can be changed by changing the arrangement of the terminal metal fitting 8. For example, in the right branch breaker 2 in FIG. 3, the terminal fitting 8 is arranged at the position where the N-phase and L1-phase branch bars 4a and 5a are inserted, and the operating voltage is 100V. The left branch breaker 2 is provided with a terminal fitting 8 at a position where the N-phase and L2-phase branch bars 4a and 6a are inserted, and the operating voltage is 100V. If terminal fittings 8 are arranged in the L1 phase and the L2 phase, the operating voltage is 200V. In addition, although what has arrange | positioned the terminal metal fitting 8 to two of the recessed parts of the primary side terminal 7 of the branch breaker 2 of this embodiment was demonstrated, the terminal metal fitting 8 may be formed in all the recessed parts. In that case, two phases of output are selected on the secondary terminal side.

  In the present invention, the current sensors 9 are arranged on at least two of the branch bars 4a, 5a, 6a, respectively. As the current sensor 9, various types such as a current divider 9 including a CT, a Hall element, a GMR element, a Rogowski coil, and a shunt resistor can be used, but the current value measuring sensor 9a disposed on one branch bar is The current value can be measured, and the energization detection sensor 9b disposed on the other branch bar may be any sensor that can detect the presence or absence of energization.

  In this embodiment, as shown on the left side of FIG. 3, a shunt resistor for energization detection is attached to the N-phase branch bar 4a as the energization detection sensor 9b, and a current value measuring sensor is attached to the L2-phase branch bar 6a. A CT capable of measuring a current value is attached as 9a. Since these current sensors 9 are also attached to the branch bars of the adjacent branch breakers 2, it is preferable to arrange them in a staggered manner as shown in the plan view of FIG. 4 in order to avoid mutual interference.

  The detection results of these current sensors 9 are sent to the determination unit 3. The determination unit 3 determines the operating voltage of each branch breaker 2 based on whether each current sensor 9 detects current. For example, as shown on the right side of FIG. 5, current sensors 9 are arranged in the N phase and the L1 phase, and when these two current sensors 9 detect current, the operating voltage of the branch breaker 2 is 100V. It is determined that there is. When the N-phase current sensor 9 does not detect current and the L1-phase current sensor 9 detects current, the operating voltage of the branch breaker 2 is determined to be 200V.

  The same applies to the case where the current sensor 9 is arranged in the N phase and the L2 phase. When the current sensors 9 are arranged in the L1 phase and the L2 phase, it is determined as 200 V if both current sensors 9 detect current, and is determined as 100 V if only one of them detects current. As described above, the determination unit 3 can automatically determine whether the operating voltage of the branch breaker 2 is 100 V or 200 V depending on whether or not each current sensor 9 detects a current. There is no need to set a working voltage for each branch breaker.

  As the determination unit 3, for example, a control unit that measures power can be used. The determination unit 3 determines the use voltage based on the output from the current sensor 9 for each branch breaker 2, calculates the use power from the voltage and the detected current value, displays it on the distribution board, and displays it on an external device. Send. Such a determination unit 3 can be provided inside or outside the panel, but the determination unit 3 may be mounted inside each branch breaker 2 and the determined information may be transmitted to the control unit.

  As described above, either of the two current sensors 9 may be the current value measuring sensor 9a capable of measuring the current value, but one current sensor 9 may be any sensor that can detect only the presence / absence of energization. For this reason, in the embodiment, different types of current sensors 9 are combined. Since the energization detection sensor 9b that detects only the presence or absence of energization does not require detection accuracy, it can be made inexpensive. In addition, the combination of the same type of current sensors 9 may be combined. In that case, the number of measuring elements of the energization detection sensor 9b for the purpose of energization detection is reduced or less accurate than the current value measurement sensor 9a. It is. In this case, the current value detection sensor 9a such as CT capable of measuring the current value and the energization detection sensor 9b are arranged in two of the three branch bars 4a, 5a, 6a, and the current value detection sensor 9b is at least If it arrange | positions in the branch bar to which electricity is supplied, and the electricity supply detection sensor 9b is arrange | positioned in one of the remaining two, it does not necessarily need to arrange in the branch bar to which electricity is supplied.

  In the above-described embodiment, a CT capable of accurately measuring a current value is used as the current value measuring sensor 9a, and a shunt consisting of a shunt resistor that is easily connected or the like is used as the energization detection sensor 9b that detects the presence or absence of energization. .

  In the first embodiment described above, the current sensors 9 are individually arranged on the branch bars 4a, 5a, 6a. However, in the second embodiment shown in FIG. 6 and subsequent figures, the current value measuring sensor 9a and the energization detection sensor are arranged. 9b is formed as a sensor unit 10 housed in one case so that it can be attached at one time.

  In this sensor unit 10, as shown in FIGS. 7 and 8, different types of current sensors 9 are arranged at the corresponding positions of the two branch bars, and the branch bars are inserted through the center of the two current sensors 9. For this purpose, the through-hole 11 is formed in a flat plate shape. If such a sensor unit 10 is used, since the current value measuring sensor 9a and the energization detection sensor 9b are integrally formed in the sensor unit 10, it can be attached in one operation, and one of the sensors is forgotten to be attached. Can be prevented. Of course, the sensor unit 10 can be mounted on both sides of the bus bars 4, 5, 6. In this case, when the sensor unit 10 formed on one side of the bus bars 4, 5 and 6 is formed with the current value measuring sensor 9b on the bus bar 5 serving as the L1 phase, the sensor unit 10 is reversed. The current value measuring sensor 9a is arranged on the L2 phase bus bar 6 of the sensor unit 10 formed on the other side.

  As shown in FIG. 8, the communication unit 12 is formed separately, and a plurality of sensor units 10 can be connected by inserting the connector 13 of the sensor unit 10 into the connector 14 of the communication unit 12. Good. If communication to the determination unit 3 is performed via the communication unit 12, there is no need to individually form a communication line from the sensor unit 10 to the determination unit 3, and wiring inside the distribution board is omitted. There are advantages that can be made.

  As described above, according to the present invention, it is not necessary to set the voltage for each branch breaker as in the prior art, and the operating voltage of each branch breaker can be set accurately.

1 Master Breaker 2 Branch Breaker 3 Judgment Unit 4 Bus Bar (N Phase)
4a Branch bar (N phase)
5 Busbar (L1 phase)
5a Branch bar (L1 phase)
6 Busbar (L2 phase)
6a Branch bar (L2 phase)
7 Primary side terminal 8 Terminal fitting 9 Current sensor 9a Current value measuring sensor 9b Energization detection sensor 10 Sensor unit 11 Through hole 12 Communication unit 13 Connector 14 Connector

Claims (3)

In a single-phase three-wire distribution board in which branch breakers are connected to at least two of the three-phase bus bars connected to the secondary terminal of the main breaker,
The bus bar includes at least two branch bars extending toward a primary terminal of each branch breaker;
Each of these branch bars is provided with a current sensor, and a determination unit is provided for determining the voltage between each branch breaker or the voltage used at the voltage pole and N phase depending on whether or not each current sensor detects current. A single-phase three-wire distribution board characterized by that. 2. The single-phase three-wire distribution board according to claim 1, wherein different types of current sensors are arranged on two branch bars extending toward a primary terminal of the same branch breaker.   The current sensor arranged on one branch bar is a current value measuring sensor for measuring a current value, and the current sensor arranged on the other branch bar is an energization detection sensor for detecting the presence or absence of energization. A single-phase three-wire distribution board according to 1 or 2.

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