JP7615735B2 - Power distribution equipment - Google Patents

Description

This disclosure relates to a power receiving and distributing device that receives and distributes power.

Facilities such as factories are provided with power receiving and distribution equipment that receives and distributes power to the facility. A busbar that supplies power is drawn into the power receiving and distribution equipment, and a vacuum circuit breaker that can disconnect the busbar may be housed in the power receiving and distribution equipment. The power receiving and distribution equipment also houses electronic equipment that controls the opening and closing of the vacuum circuit breaker. Furthermore, because the electronic equipment operates at low voltage, the vacuum circuit breaker cannot be directly controlled using the output signal of the electronic equipment. Patent Document 1 discloses a relay connection unit equipped with an auxiliary relay. The auxiliary relay is used as a control circuit for controlling the vacuum circuit breaker.

JP 2018-196211 A

Incidentally, a power distribution device may detect some abnormality by detecting the current and voltage flowing through a bus bar, and notify one or more monitoring devices of the detection result.
However, in the conventional technology, because electronic devices generate detection signals indicating abnormalities, the power distribution device has a limited ability to transmit the detection signals, which causes problems such as a limitation in the distance from the power distribution device to the monitoring device or a failure to transmit the detection signal to multiple monitoring devices.
The present disclosure has been made in consideration of the above circumstances, and an object of the present disclosure is to improve the ability to transmit a signal generated by a power distribution device to a plurality of monitoring devices.

To solve the above problems, the power receiving and distributing device disclosed herein includes a circuit breaker provided on a power supply line that supplies power, a control device that controls the opening and closing of the circuit breaker and outputs a plurality of digital signals that indicate the electrical state of the power supply line, a control board having a plurality of relays provided in one-to-one correspondence with the plurality of digital signals, and an external line terminal block having a plurality of first terminals that are connected to some or all of the terminals of the plurality of relays.

1 is a block diagram showing a configuration example of a power receiving and distributing device 1. FIG. FIG. 2 is a block diagram showing a configuration example of a control device 10. 2 is a block diagram showing an example of the configuration of a control board 20. FIG. FIG. 2 is a circuit diagram showing a configuration example of a relay Rn. 2 is an explanatory diagram showing a configuration example of an external line terminal block 30. FIG. FIG. 13 is an explanatory diagram of a case where an OR circuit is configured using jumper wiring. FIG. 13 is an explanatory diagram of a case where an AND circuit is configured using jumper wiring.

Below, embodiments of the present disclosure will be described with reference to the drawings. Note that the dimensions and scale of each part in the drawings may differ from those in reality. The embodiments described below are preferred specific examples of the present disclosure. For this reason, various technically preferable limitations are imposed on the following embodiments. However, the scope of the present disclosure is not limited to these forms unless otherwise specified in the following description to the effect that the present disclosure is limited.

1. Embodiment Fig. 1 is a block diagram showing a configuration example of a power receiving and distributing device 1 according to an embodiment of the present disclosure. The power receiving and distributing device 1 includes a bus L, a control device 10, a control board 20, an external line terminal block 30, a voltage transformer VT, a vacuum circuit breaker VCB, a current transformer CT, and a zero-phase voltage detector ZPD. The voltage transformer VT, the current transformer CT, and the zero-phase voltage detector ZPD are examples of measuring devices that measure physical quantities related to the distribution of power.

The bus L is composed of three power supply lines L1 to L3. Three-phase AC voltage is supplied to the power supply lines L1 to L3.

The instrument transformer VT reduces and outputs the voltage of the bus bar L with a transformation ratio determined according to the number of primary windings and the number of secondary windings. For example, assume that the R-phase power supply line L1 and the S-phase power supply line L2 are connected to the primary winding, the AC voltage is 6600 V, and the transformation ratio is 60. In this case, the output voltage of the instrument transformer VT is 110 V. The output voltage Vout of the instrument transformer VT is supplied to the control device 10. The output voltage Vout is an example of a measurement signal.

The vacuum circuit breaker VCB is provided on the bus L that supplies power. The vacuum circuit breaker VCB is an example of a circuit breaker. The vacuum circuit breaker VCB is equipped with a vacuum valve, and the contacts are opened and closed within the vacuum valve. The vacuum circuit breaker VCB is suitable for interrupting high voltages because arcs are quickly extinguished in a vacuum. The vacuum circuit breaker VCB performs opening and closing control based on a control signal CTL output from the control device 10.

The current transformer CT for measurement is provided on the bus bar L. The current transformer CT for measurement converts a large current into a small current for each phase according to the current transformation ratio and outputs the converted current. The output current Iout of the current transformer CT for measurement is, for example, about 5 A. The output current Iout is composed of an output current Ir corresponding to the R phase, an output current Is corresponding to the S phase, and an output current It corresponding to the T phase. The output current Iout is supplied to the control device 10. The output current Iout, the output current Ir, the output current Is, and the output current It are examples of measurement signals.

The zero-phase voltage detector ZPD is connected to the bus L and detects the zero-phase voltage. In a normal state, the zero-phase voltage is zero, but if a ground fault occurs in any of the three phases, the zero-phase voltage rises. For example, if the AC voltage is 6,600 V and a ground fault occurs in the R phase, the zero-phase voltage becomes 11,430 V. The zero-phase voltage detector ZPD includes, for example, three phase capacitors connected one-to-one to the power supply lines L1 to L3, a detection capacitor connected in common to the three phase capacitors, and a transformer. The applied voltage of the detection capacitor is determined according to the ratio between the capacitance value of the phase capacitor and the capacitance value of the detection capacitor. Furthermore, a detection voltage Vdet, which is the applied voltage reduced by the transformer, is output from the zero-phase voltage detector ZPD to the control device 10. The detection voltage Vdet is an example of a measurement signal.

FIG. 2 is a block diagram showing an example of the configuration of the control device 10. As shown in FIG. 2, the control device 10 includes a control circuit 11, an attenuation circuit 12, and transformers 13 to 15. The attenuation circuit 12 outputs a measurement voltage Vs obtained by attenuating the output voltage Vout according to an attenuation ratio. The attenuation circuit 12 is, for example, composed of a first resistor and a second resistor connected in series. The output voltage Vout is applied to one end of the first resistor. One end of the second resistor is grounded. The other end of the first resistor and the other end of the second resistor are connected, and the measurement voltage Vs is output from the connection point. If the resistance value of the first resistor is r1 and the resistance value of the second resistor is r2, the attenuation ratio is r2/(r1+r2). The attenuation ratio is set so that the measurement voltage Vs becomes a voltage that can be input to the control circuit 11. The measurement voltage Vs is also supplied to an analog terminal Ta1. The measurement voltage Vs is an example of an analog signal, and the attenuation circuit 12 is an example of a generation circuit that generates an analog signal according to a measurement signal. The attenuation circuit 12 may also be configured as a transformer.

The primary sides of the transformers 13 to 15 are supplied with the output current Ir, the output current Is, and the output current It. The secondary sides of the transformers 13 to 15 are connected to the control circuit 11. The transformers 13 to 15 attenuate the magnitudes of the output current Ir, the output current Is, and the output current It to an extent that they can be input to the control circuit 11. The transformers 13 to 15 output the measurement currents Isr, Iss, and Ist that are obtained by attenuating the output current Ir, the output current Is, and the output current It according to the attenuation ratio. The control circuit 11 includes a conversion circuit that converts the current into a voltage. The output signal of the conversion circuit is an analog signal that indicates the current value. The control circuit 11 outputs the R-phase current value signal Sr corresponding to the output current Ir, the S-phase current value signal Ss corresponding to the output current Is, and the T-phase current value signal St corresponding to the output current It to the analog terminals Ta2 to Ta4. The transformers 13 to 15 and the conversion circuit are an example of a generation circuit.

The control device 10 has analog terminals Tb1 to Tb4 that correspond one-to-one to the analog terminals Ta1 to Ta4. The analog terminals Tb1 to Tb4 are grounded. The third cable C3 is connected to the analog terminals Ta1 and Tb1, the fourth cable C4 is connected to the analog terminals Ta2 and Tb2, the fifth cable C5 is connected to the analog terminals Ta3 and Tb3, and the fourth cable C4 is connected to the analog terminals Ta4 and Tb4. The third cable C3, the fourth cable C4, the fifth cable C5, and the sixth cable C6 are configured as twisted pairs. By configuring these cables as twisted pairs, it is possible to cancel common-mode noise. The analog signal generated by the control device 10 is supplied to the external line terminal block 30 via the third cable C3, the fourth cable C4, the fifth cable C5, and the sixth cable C6.

The control circuit 11 judges whether the current values of the measured current Isr, the measured current Iss, and the measured current Ist are in a normal state or an abnormal state based on the output signal of the conversion circuit. Specifically, the control circuit 11 judges that the current values of the measured current Isr, the measured current Iss, and the measured current Ist are in a normal state when they are equal to or less than the reference current value. The control circuit 11 also judges that the current values of the output current Ir, the output current Is, and the output current It are in an abnormal state when they exceed the reference current value. The control circuit 11 generates a first digital signal D1 that is at a high level when the R-phase current is in an abnormal state and at a low level when the R-phase current is in a normal state. The control circuit 11 generates a second digital signal D2 that is at a high level when the S-phase current is in an abnormal state and at a low level when the S-phase current is in a normal state. The control circuit 11 generates a third digital signal D3 that is at a high level when the T-phase current is in an abnormal state and at a low level when the T-phase current is in a normal state. Furthermore, the control circuit 11 generates a fourth digital signal D4 that is at a high level when at least one of the R-phase current, the S-phase current, and the T-phase current is in an abnormal state, and is at a low level when all of the R-phase current, the S-phase current, and the T-phase current are in a normal state. The first digital signal D1, the second digital signal D2, the third digital signal D3, and the fourth digital signal D4 are examples of overcurrent detection signals.

In addition, the control circuit 11 generates a fifth digital signal D5 based on the detection voltage Vdet. The fifth digital signal D5 is at a high level when the zero-phase voltage is in an abnormal state and at a low level when the zero-phase voltage is in a normal state.

The control circuit 11 also determines whether the voltage value of the AC voltage supplied to the bus bar L is insufficient based on the measured voltage Vs. Specifically, by comparing the voltage value of the measured voltage Vs with a reference voltage value, a sixth digital signal D6 is generated that is at a high level when the voltage value of the measured voltage Vs is less than the reference voltage value and is at a low level when the voltage value of the measured voltage Vs is equal to or greater than the reference voltage value. The sixth digital signal D6 is an example of an undervoltage detection signal that is active when the output voltage Vout is insufficient. The control circuit 11 generates the undervoltage detection signal based on the result of comparing the voltage value of the measured voltage Vs with the reference voltage value.

Furthermore, the control circuit 11 generates a control signal CTL that goes to a high level when at least one of the R-phase current, the S-phase current, and the T-phase current is in an abnormal state, when the zero-phase voltage is in an abnormal state, or when the AC voltage supplied to the bus bar L is insufficient. The control signal CTL goes to a low level in a normal state. The voltage level of the control signal CTL is set so as to be able to control the vacuum circuit breaker VCB.

The above-mentioned first to sixth digital signals D1 to D6 are connected to the first connector CN1 via wiring on the board. As described above, the first to sixth digital signals D1 to D6 are determined based on the current flowing through the power supply lines L1 to L3 or the voltage applied to the power supply lines L1 to L3. Therefore, the first to sixth digital signals D1 to D6 indicate the electrical state of the power supply lines L1 to L3.

Next, the control board 20 will be described. FIG. 3 is a block diagram showing an example of the configuration of the control board 20. As shown in FIG. 3, the control board 20 includes six relays R1 to R6, a second connector CN2, and a third connector CN3. The control board 20 and the control device 10 are connected via a first cable C1 and a first relay terminal block TB1 as shown in FIG. 1. The first cable C1 is a multi-core cable. The first cable C1 also includes a first individual cable C11 and a second individual cable C12. The first relay terminal block TB1 relays the first individual cable C11 and the second individual cable C12. The first cable C1 has a connector at one end and also has a connector at the other end. Specifically, each of the first individual cable C11 and the second individual cable C12 has a connector at one end and the other end. One end of the first cable C1 corresponds to one end of the first individual cable C11, and the other end of the first cable C1 corresponds to the other end of the second individual cable C12. Therefore, in the assembly process of the power receiving and distributing device 1, if the connector provided at one end of the first cable C1 is connected to the first connector CN1 of the control device 10, and the connector provided at the other end of the first cable C1 is connected to the second connector CN2 of the control board 20, the control device 10 and the control board 20 are connected. By using a multi-core cable and a connector in this way, the work area can be reduced. Therefore, the time required to assemble the power receiving and distributing device 1 can be significantly reduced. Also, it is possible to eliminate connection errors in the wiring. In addition, by using the first relay terminal block TB1, it becomes possible to apply it to various devices. Specifically, even if the type of the control device 10 is changed, it can be easily connected to the control board 20. As a result, the work area in the assembly process is reduced.

In this example, the six relays R1 to R6 are configured in the same way. If n is a natural number between 1 and 6, the nth digital signal Dn is supplied to the control terminal of relay Rn via the second connector CN2. In other words, relays R1 to R6 are provided in one-to-one correspondence with the first to sixth digital signals D1 to D6.

Figure 4 is a circuit diagram showing an example of the configuration of relay Rn. As shown in the figure, relay Rn has output terminals 201 to 205, control terminals 206 and 207, and switches SW1 to SW3. Switch SW1 is normally closed, and opens when a current flows between control terminals 206 and 207. Switches SW2 and SW3 are normally open, and close when a current flows between control terminals 206 and 207. Output terminal 202 is a b-contact, output terminals 203 and 205 are a-contacts, and output terminals 201 and 204 function as a common terminal. In Figure 4, a coil (not shown) is provided between control terminal 206 and control terminal 207. In this example, control terminal 206 is grounded, and n-th digital signal Dn is supplied to control terminal 207. Each of output terminals 201 to 205 of relay Rn is connected to third connector CN3 via wiring. It should be noted that relay Rn may be used in combination with a timer circuit. In this case, the nth digital signal Dn is input to the input terminal of the timer circuit, and the output terminal of the timer circuit is connected to the control terminal of relay Rn. The timer circuit delays the nth digital signal Dn by a predetermined time and outputs it from the output terminal.

The six relays R1 to R6 provided on the control board 20 are used to transmit the first to sixth digital signals D1 to D6 to multiple external devices such as monitoring devices. Generally, the amplitude of a digital signal is several volts. Assume that the first to sixth digital signals D1 to D6 are transmitted from the control device 10. Since the high level of the first to sixth digital signals D1 to D6 is several volts, if noise is superimposed on the signal, the monitoring device may malfunction. In addition, if the transmission distance of the first to sixth digital signals D1 to D6 is long, the stray capacitance of the wiring becomes large. For this reason, the control circuit 11 of the control device 10 needs to drive a capacitive load. Therefore, the circuit scale of the output stage of the control circuit 11 becomes large. In this embodiment, the relays R1 to R6 are used to reliably transmit the first to sixth digital signals D1 to D6 to external devices such as monitoring devices and to reduce the circuit scale of the output stage of the control circuit 11.

As shown in FIG. 1, the control board 20 and the external line terminal block 30 are connected via the second cable C2 and the second relay terminal block TB2. The second cable C2 is a multi-core cable. The second cable C2 also includes a third individual cable C21 and a fourth individual cable C22. A connector is provided at one end of the second cable C2. The connector of the second cable C2 is connected to the third connector CN3 of the control board 20. The other end of the second cable C2 is a loose wire. One end of the second cable C2 corresponds to one end of the third individual cable C21, and the other end of the second cable C2 corresponds to the other end of the fourth individual cable C22. Connectors are provided at both ends of the third individual cable C21. A connector is provided at one end of the fourth individual cable C22, and the other end of the fourth individual cable C22 is a loose wire. The second relay terminal block TB2 relays the third individual cable C21 and the fourth individual cable C22. As described above, the analog signal generated by the control device 10 is supplied to the external line terminal block 30 via the third cable C3, the fourth cable C4, the fifth cable C5, and the sixth cable C6. Various signals are output to multiple monitoring devices via the external line terminal block 30. In the assembly process of the power distribution device 1, a connector provided at one end of the second cable C2 is connected to the third connector CN3 of the control board 20. By using a multi-core cable and a connector in this way, the work area can be reduced. In addition, by using the second relay terminal block TB2, it can be applied to various devices. Specifically, even if the type of the control board 20 is changed, it can be easily connected to the external line terminal block 30. As a result, the work area is reduced in the assembly process.

Figure 5 shows an example of the configuration of the external line terminal block 30. The external line terminal block 30 has 30 first terminals T101 to T130 connected to relays R1 to R6 via a third cable C3, and second terminals Ta21 to Ta24 and Tb21 to Tb24. The 30 first terminals T101 to T130 are connected in a one-to-one relationship to the output terminals 201 to 205 of relays R1 to R6. Meanwhile, the second terminals Ta21 to Ta24 are connected in a one-to-one relationship to the analog terminals Ta1 to Ta4 of the control device 10, and the second terminals Tb21 to Tb24 are connected in a one-to-one relationship to the analog terminals Tb1 to Tb4 of the control device 10. Each terminal constituting the external line terminal block 30 is secured by a screw.

Next, a description will be given of a mode of configuring a logic circuit using a jumper wire. FIG. 6 is an explanatory diagram showing an example of the configuration of an OR circuit using a jumper wire. As shown in FIG. 6, the first terminals T116 and T126 are connected by a jumper wire La, the first terminals T118 and T128 are connected by a jumper wire Lb, the first terminals T119 and T129 are connected by a jumper wire Lc, and the first terminals T120 and T130 are connected by a jumper wire Ld. In this example, the switch SW2 of the relay R4 and the switch SW2 of the relay R6 are connected in parallel. Therefore, when either one of the fourth digital signal D4 and the sixth digital signal D6 becomes a high level, the first terminal T116 and the first terminal T118 are conductive, and the first terminal T119 and the first terminal T120 are conductive. Thus, an OR circuit is configured.

Here, the fourth digital signal D4 becomes high level when at least one of the R-phase current, the S-phase current, and the T-phase current is in an abnormal state. That is, the fourth digital signal D4 becomes active when an overcurrent flows through the bus bar L. The sixth digital signal D6 becomes active when the AC voltage is below the reference voltage, that is, an undervoltage state.

Therefore, by using the jumper wirings La to Lc, when there is an abnormality in the current flowing through the bus bar L or when there is an abnormality in the AC voltage applied to the bus bar L, a signal that becomes active can be transmitted to multiple monitoring devices. Note that the relay R4 shown in FIG. 6 is an example of a first relay, and the relay R6 is an example of a second relay. Also, the first terminals T116 to T120 are an example of multiple first relay terminals corresponding to the relay R4. Furthermore, the first terminals T126 to T130 are an example of multiple second relay terminals corresponding to the relay R6.

Figure 7 is an explanatory diagram showing an example of the configuration of an OR circuit using a jumper wire. As shown in Figure 7, the first terminals T118 and T126 are connected by a jumper wire Le, and the first terminals T120 and T129 are connected by a jumper wire Lf. In this example, the switch SW2 of the relay R4 and the switch SW2 of the relay R6 are connected in series. Therefore, when both the fourth digital signal D4 and the sixth digital signal D6 are at a high level, the first terminal T116 and the first terminal T128 are conductive, and the first terminal T119 and the first terminal T130 are conductive. Thus, an AND circuit is formed. Therefore, by using the jumper wires Le and Lf, when there is an abnormality in the current flowing through the bus bar L and when there is an abnormality in the AC voltage applied to the bus bar L, a signal that becomes active can be transmitted to multiple monitoring devices.

As described above, the power distribution device 1 includes a vacuum circuit breaker VCB provided on the bus L that supplies power, a control device 10 that controls the opening and closing of the vacuum circuit breaker VCB and outputs a plurality of digital signals D1-D6 that indicate the electrical state of the power supply lines L1-L3, a control board 20 having a plurality of relays R1-R6 that are provided in one-to-one correspondence with the plurality of digital signals D1-D6, and an external line terminal block 30 that includes a plurality of first terminals T101-T130 that are connected to some or all of the output terminals 201-205 of the plurality of relays R1-R6. The power distribution device 1 includes a plurality of relays R1-R6 that are connected to the external line terminal block 30, and thus can transmit a plurality of digital signals D1-D6 to a plurality of external devices such as monitoring devices.

In the power receiving and distributing device 1, the control device 10 includes a first connector CN1 to which a plurality of digital signals D1 are supplied, and the control board 20 includes a second connector CN2 connected to the first connector CN1 via the first cable C1. At least one of the control board 20 and the external line terminal block 30 includes a third connector CN3, and the control board 20 and the external line terminal block 30 are connected to each other via the second cable C2. Here, it is preferable that the control board 20 includes the third connector CN3. According to this aspect, the control device 10 and the first cable C1 are connected to each other using a connector, so that the assembly man-hours of the power receiving and distributing device 1 can be reduced. Also, the wiring connection errors can be reduced. Furthermore, at least one of the control board 20 and the external line terminal block 30 is connected to the second cable C2 using a connector, so that the power receiving and distributing device 1 can be easily assembled.

The control device 10 includes a generating circuit that generates an analog signal corresponding to a measurement signal output from a measuring device that measures a physical quantity related to the distribution of power, and an analog terminal Ta1 to which the analog signal is supplied. The measuring device may include a measuring device voltage transformer VT and a measuring device current transformer CT. The external line terminal block 30 includes a second terminal Ta21 that is connected to the analog terminal Ta1 via a fourth cable C4. According to this aspect, the external line terminal block 30 can output an analog signal in addition to a digital signal. In addition, the analog signal is supplied from the control device 10 to the external line terminal block 30 via the fourth cable C4 without passing through the control board 20 that operates based on a plurality of digital signals. Since the transmission path of the digital signal and the transmission path of the analog signal are separated in this way, noise caused by the digital signal is suppressed from being superimposed on the analog signal.

The measurement device may be, for example, a current transformer CT for measuring the current flowing through the power supply lines L1 to L3, and the measurement signals may be the output current Ir corresponding to the R phase, the output current Is corresponding to the S phase, and the output current It corresponding to the T phase. According to this embodiment, the output current Ir, the output current Is, and the output current It corresponding to the current flowing through the power supply lines L1 to L3 can be input to the control device 10.

The measuring device preferably measures the current flowing through the power supply lines L1 to L3 or the voltage of the power supply lines L1 to L3, and the measurement signal preferably indicates the magnitude of the current or the magnitude of the voltage.

The measuring device is a measuring transformer VT that measures the voltage of the power supply lines L1 to L3, and the measurement signal is preferably an output voltage Vout obtained by attenuating the voltage of the power supply lines L1 to L3 according to a transformation ratio. According to this aspect, the control device 10 can capture the output voltage Vout.

The control device 10 includes an attenuation circuit 12 that outputs a measured voltage Vs obtained by attenuating the output voltage Vout according to an attenuation ratio, and a control circuit 11 that generates an undervoltage detection signal that becomes active when the output voltage Vout is insufficient based on the result of comparing the voltage value of the measured voltage Vs with a reference voltage value, and the undervoltage detection signal is preferably included in multiple digital signals. According to this aspect, when the power supply lines L1 to L3 are low, the undervoltage detection signal can be output to multiple monitoring devices, so that protection coordination can be implemented using multiple monitoring devices.

The measuring device is a measuring current transformer CT that measures the current in the power supply lines L1 to L3, and the measurement signal is preferably an output current Iout obtained by attenuating the current flowing through the power supply lines L1 to L3 according to the current transformation ratio. According to this aspect, the control device 10 can capture the output current Iout.

The control device 10 includes transformers 13-15 that output measurement currents Isr, Iss, and Ist that are attenuated according to an attenuation ratio of the output current Iout, and a control circuit 11 that generates an overcurrent detection signal that becomes active when the current values of the measurement currents Isr, Iss, and Ist exceed a reference current value, and the overcurrent detection signal is preferably included in multiple digital signals. According to this aspect, when the current flowing through the power supply lines L1-L3 is excessive, the overcurrent detection signal can be output to multiple monitoring devices, making it possible to implement protection coordination using multiple monitoring devices.

The multiple relays R1 to R6 include a first relay R4 and a second relay R6, and the multiple first terminals T101 to T130 include a multiple first relay terminals T116 to T120 corresponding to the first relay R4 and a multiple second relay terminals T126 to T130 corresponding to the second relay R6, and it is preferable that any one terminal T116 of the multiple first relay terminals T116 to T120 and any one terminal T126 of the multiple second relay terminals T126 to T130 are connected via a jumper wiring La.
According to this embodiment, since the first relay R4 and the second relay are connected by a jumper wiring, various logic circuits such as an OR circuit or an AND circuit can be configured. Therefore, a signal corresponding to an item to be monitored by the monitoring device can be generated in the external line terminal block 30.

2. Modification (1) In the above-described embodiment, a zero-phase voltage detector ZPD is used as an example of a measuring device.
Although the measurement current transformer CT and the measurement voltage transformer VT are illustrated, the present disclosure is not limited thereto. The measurement device may be any device that measures a physical quantity related to the distribution of power. For example, the measurement device may be a zero-phase current transformer that detects a ground fault current.

(2) In the above-described embodiment, a vacuum circuit breaker VCB is used as an example of a circuit breaker, but the present disclosure is not limited to this. For example, a vacuum contactor may be used as a circuit breaker.

(3) In the above-described embodiment, a connector may be provided on the other end of the second cable C2 and on the external terminal block 30, and the connector located at the other end of the second cable C2 and the connector provided on the external terminal block 30 may be connected. In this case, since connectors are provided on both ends of the second cable C2, the assembly of the power receiving and distribution device 1 can be further facilitated and wiring errors can be eliminated. Also, a connector may be provided on the other end of the second cable C2 and on the external terminal block 30, and the second connector CN2 may be removed from the control board 20. In this case, the control board 20 and the second cable C2 are connected in a loose wire state. On the other hand, it is sufficient to connect the connector of the second cable C2 and the connector provided on the external terminal block 30. In this aspect, the assembly of the power receiving and distribution device 1 can be facilitated and wiring errors can be eliminated, compared to a case in which the control board 20 is not provided with the third connector CN3 and the external terminal block 30 is not provided with a connector.

(3) In the above-described embodiment, the first cable C1 includes a first individual cable C11 and a second individual cable C12, and the first individual cable C11 and the second individual cable C12 are connected to the control device 10 and the control board 20 via the first relay terminal block TB1. The present disclosure is not limited to this, and the first cable C1 may be configured as a single cable. In this case, the first relay terminal block TB1 is not required. The second cable C2 includes a third individual cable C21 and a fourth individual cable C22, and the third individual cable C21 and the fourth individual cable C22 are connected to the control board 20 and the external line terminal block 30 via the second relay terminal block TB2. The present disclosure is not limited to this, and the second cable C2 may be configured as a single cable. In this case, the second relay terminal block TB2 is not required.

(4) In the above-described embodiment, all of the output terminals T201 to T205 of the relays R1 to R6 are connected to the first terminals T101 to T130 of the external line terminal block 30 via the third connector CN3 and the second cable C2. However, the present disclosure is not limited to this, and some of the output terminals T201 to T205 of the relays R1 to R6 may be connected to some of the first terminals T101 to T130 via the third connector CN3 and the second cable C2. For example, in the power distribution device 1, if it is not necessary to output the fifth digital signal D5 to the monitoring device, it is not necessary to provide wiring connecting the output terminals T201 to T205 of the relay R5 to the third connector CN3. In this case, the output terminals T201 to T205 of the relay R5 are not connected to the first terminals T121 to T125.

1...power distribution device, 10...control device, 11...control circuit, 12...attenuation circuit, 13-1-5...transformer, 20...control board, 30...external line terminal block, ZPD...zero-phase voltage detector, CT...current transformer for measuring instruments, VCB...high-voltage circuit breaker, VT...voltage transformer for measuring instruments, R1-R6...relay, CN1...first connector, CN2...second connector, CN3...third connector, C1...first cable, C2...second cable, C3...third cable, Ta1-Ta4, Tb1-Tb4, ...analog terminals, T101-T130...first terminals, Ta21-Ta24, Tb21-Tb24...second terminals, La-Lf...crossover wiring.

Claims (9)

A circuit breaker provided in a power supply line for supplying power;
a control device that controls the opening and closing of the circuit breaker and outputs a plurality of digital signals that indicate an electrical state of the power supply line;
a control board having a plurality of relays provided in one-to-one correspondence with the plurality of digital signals;
an external line terminal block including a plurality of first terminals connected to some or all of the output terminals of the plurality of relays ;
The control device includes:
An action corresponding to a measurement signal output from a measuring device that measures a physical quantity related to the distribution of the electric power
a generating circuit for generating an analog signal;
an analog terminal to which the analog signal is supplied;
The external line terminal block includes a second terminal connected to the analog terminal via a fourth cable.
Er,
Power distribution equipment. A circuit breaker provided in a power supply line for supplying power;
a control device that controls the opening and closing of the circuit breaker and outputs a plurality of digital signals that indicate an electrical state of the power supply line;
a control board having a plurality of relays provided in one-to-one correspondence with the plurality of digital signals;
an external line terminal block including a plurality of first terminals connected to some or all of the output terminals of the plurality of relays ;
the plurality of relays includes a first relay and a second relay;
The first terminals include a plurality of first relay terminals corresponding to the first relay and a plurality of second relay terminals corresponding to the second relay.
a plurality of second relay terminals corresponding to the relay;
Any one of the first relay terminals and the second relay terminals
One of the terminals is connected via a jumper wiring.
Power distribution equipment the control device includes a first connector to which the plurality of digital signals are supplied;
the control board includes a second connector connected to the first connector via a first cable,
At least one of the control board and the external line terminal block includes a third connector,
The control board and the external line terminal block are connected via a second cable.
The power receiving and distributing device according to claim 1 or 2 . The first cable includes a first individual cable and a second individual cable,
the second cable includes a third individual cable and a fourth individual cable;
a first relay terminal block that relays the first individual cable and the second individual cable;
a second relay terminal block that relays the third individual cable and the fourth individual cable,
The power receiving and distributing device according to claim 3 . The measuring device measures a current flowing through the power supply line or a voltage of the power supply line,
The measurement signal indicates a magnitude of the current or a magnitude of the voltage.
The power receiving and distributing device according to claim 1 . the measurement device is a voltage transformer that measures a voltage of the power supply line,
The measurement signal is an output voltage obtained by attenuating the voltage of the power supply line according to a transformation ratio.
The power receiving and distributing device according to claim 5 . The control device includes:
an attenuation circuit that outputs a measurement voltage obtained by attenuating the output voltage according to an attenuation ratio;
a control circuit for generating an undervoltage detection signal that becomes active when the output voltage is insufficient based on a comparison result between the voltage value of the measured voltage and a reference voltage value;
The undervoltage detection signal is included in the plurality of digital signals.
The power receiving and distributing device according to claim 6. the measuring device is a current transformer for measuring a current of the power supply line,
The measurement signal is an output current obtained by attenuating the current of the power supply line according to a current transformation ratio.
The power receiving and distributing device according to claim 5 . The control device includes:
a transformer that outputs a measurement current obtained by attenuating the output current according to an attenuation ratio;
a control circuit for generating an overcurrent detection signal that becomes active when the current value of the measured current exceeds a reference current value;
The overcurrent detection signal is included in the plurality of digital signals.
The power receiving and distributing device according to claim 8 .

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