Power distribution equipment

Abstract

To transmit digital signals to a plurality of external devices.SOLUTION: A receiving and distributing device 1 comprises: a vacuum circuit breaker VCB provided on power supply lines L1 to L3 for supplying power; a control device 10 that controls opening / closing of the vacuum circuit breaker VCB and outputs a plurality of digital signals D1 to D6 indicating electrical states of the power supply lines L1 to L3; a control substrate 20 that has a plurality of relays R1 to R6 provided in one-to-one correspondence with the plurality of digital signals D1 to D6; and an external line terminal base 30 that has a plurality of first terminals T101 to T130 connected with some or all of terminals of the plurality of relays R1 to R6.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a power receiving and distributing device that receives and distributes power. [Background technology]

[0002] Facilities such as factories are provided with power receiving and distribution equipment that receives and distributes power to the facilities. 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, since 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. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-196211 A Summary of the Invention [Problem to be solved by the invention]

[0004] 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. [Means for solving the problem]

[0005] In order to solve the above problems, the power distribution device disclosed herein includes a circuit breaker provided in a power supply line that supplies electric power, a control device that controls the opening and closing of the circuit breaker and outputs a plurality of digital signals indicating 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 connected to some or all of the terminals of the plurality of relays. [Brief description of the drawings]

[0006] [Figure 1] 1 is a block diagram showing a configuration example of a power receiving and distributing device 1. FIG. [Diagram 2] 2 is a block diagram showing a configuration example of a control device 10. FIG. [Diagram 3] 2 is a block diagram showing an example of the configuration of a control board 20. FIG. [Figure 4] FIG. 2 is a circuit diagram showing a configuration example of a relay Rn. [Diagram 5] 2 is an explanatory diagram showing a configuration example of an external line terminal block 30. FIG. [Figure 6] FIG. 13 is an explanatory diagram of a case where an OR circuit is configured using jumper wiring. [Figure 7] FIG. 13 is an explanatory diagram of a case where an AND circuit is configured using jumper wiring. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] Hereinafter, an embodiment 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 the actual ones. The embodiments described below are preferred specific examples of the present disclosure. For this reason, various technically preferable limitations are attached to the following embodiments. However, the scope of the present disclosure is not limited to these forms unless otherwise specified in the following description to limit the present disclosure.

[0008] 1. Embodiment 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 power distribution.

[0009] The bus L is composed of three power supply lines L1 to L3. A three-phase AC voltage is supplied to the power supply lines L1 to L3.

[0010] The voltage transformer VT reduces and outputs the voltage of the bus L with a transformation ratio determined according to the number of primary windings and the number of secondary windings. For example, assume that an R-phase power supply line L1 and an 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 voltage transformer VT is 110 V. The output voltage Vout of the voltage transformer VT is supplied to the control device 10. The output voltage Vout is an example of a measurement signal.

[0011] The vacuum circuit breaker VCB is provided on a bus L that supplies electric 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 contacts are opened and closed within the vacuum valve. Since arcs are quickly extinguished in a vacuum, the vacuum circuit breaker VCB is suitable for interrupting high voltages. The vacuum circuit breaker VCB performs opening and closing control based on a control signal CTL output from the control device 10.

[0012] 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 a 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.

[0013] 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 6600V and a ground fault occurs in the R phase, the zero-phase voltage becomes 11430V. 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 commonly connected 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 obtained by reducing the applied voltage 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.

[0014] FIG. 2 is a block diagram showing a configuration example 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 composed of, for example, 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. In addition, the measurement voltage Vs is 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 be composed of a transformer.

[0015] 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 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 an attenuation ratio. The control circuit 11 includes a conversion circuit that converts a current into a voltage. The output signal of the conversion circuit is an analog signal indicating a current value. The control circuit 11 outputs an R-phase current value signal Sr corresponding to the output current Ir, an S-phase current value signal Ss corresponding to the output current Is, and a 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.

[0016] The control device 10 includes 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. An 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.

[0017] The control circuit 11 judges whether each of the current values ​​of the measurement current Isr, the measurement current Iss, and the measurement current Ist is 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 measurement current Isr, the measurement current Iss, and the measurement current Ist are in a normal state when they are equal to or less than a 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 a 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 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, and goes to 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.

[0018] Furthermore, the control circuit 11 generates a fifth digital signal D5 based on the detection voltage Vdet. The fifth digital signal D5 goes to a high level when the zero-phase voltage is in an abnormal state, and goes to a low level when the zero-phase voltage is in a normal state.

[0019] 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 comparison result between the voltage value of the measured voltage Vs and the reference voltage value.

[0020] 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.

[0021] 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 currents flowing through the power supply lines L1 to L3 or the voltages applied to the power supply lines L1 to L3. Therefore, the first to sixth digital signals D1 to D6 indicate the electrical states of the power supply lines L1 to L3.

[0022] Next, the control board 20 will be described. FIG. 3 is a block diagram showing a configuration example 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 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 includes a connector at one end and also includes a connector at the other end. Specifically, each of the first individual cable C11 and the second individual cable C12 includes 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 a connector provided at one end of the first cable C1 is connected to the first connector CN1 of the control device 10, and a 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.

[0023] In this example, the six relays R1 to R6 have the same configuration. If n is a natural number between 1 and 6, an n-th digital signal Dn is supplied to the control terminal of the relay Rn via the second connector CN2. In other words, the relays R1 to R6 are provided in one-to-one correspondence with the first to sixth digital signals D1 to D6.

[0024] FIG. 4 is a circuit diagram showing a configuration example of the relay Rn. As shown in the figure, the relay Rn includes output terminals 201 to 205, control terminals 206 and 207, and switches SW1 to SW3. The switch SW1 is normally closed, and opens when a current flows between the control terminals 206 and 207. The switches SW2 and SW3 are normally open, and close when a current flows between the control terminals 206 and 207. The output terminal 202 is a b-contact, the output terminals 203 and 205 are a-contacts, and the output terminals 201 and 204 function as a common terminal. In FIG. 4, a coil (not shown) is provided between the control terminals 206 and 207. In this example, the control terminal 206 is grounded, and the n-th digital signal Dn is supplied to the control terminal 207. Each of the output terminals 201 to 205 of the relay Rn is connected to the third connector CN3 via a wiring. The 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 the relay Rn. The timer circuit outputs the nth digital signal Dn from the output terminal with a predetermined delay.

[0025] 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 floating capacitance of the wiring increases. Therefore, 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 increases. 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.

[0026] 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 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. Also, the analog signal generated by the control device 10 as described above 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 a plurality of monitoring devices via the external line terminal block 30. In the assembly process of the power receiving and distributing 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 becomes possible to apply 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.

[0027] 5 shows an example of the configuration of the external line terminal block 30. The external line terminal block 30 includes 30 first terminals T101-T130 and second terminals Ta21-Ta24 and Tb21-Tb24, which are connected to the relays R1-R6 via the third cable C3. The 30 first terminals T101-T130 are connected to the output terminals 201-205 of the relays R1-R6 in a one-to-one relationship. Meanwhile, the second terminals Ta21-Ta24 are connected to the analog terminals Ta1-Ta4 of the control device 10 in a one-to-one relationship, and the second terminals Tb21-Tb24 are connected to the analog terminals Tb1-Tb4 of the control device 10 in a one-to-one relationship. Each terminal constituting the external line terminal block 30 is fastened with a screw.

[0028] Next, an embodiment of configuring a logic circuit using a jumper wire will be described. FIG. 6 is an explanatory diagram showing a configuration example 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.

[0029] Here, the fourth digital signal D4 goes high 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 goes active when an overcurrent flows through the bus bar L. Also, the sixth digital signal D6 goes active when the AC voltage is below the reference voltage, that is, an undervoltage state.

[0030] Therefore, by using the transition 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.

[0031] FIG. 7 is an explanatory diagram showing a configuration example of an OR circuit using a jumper wire. As shown in FIG. 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.

[0032] As described above, the power receiving and 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 indicating the electrical states of the power supply lines L1-L3, a control board 20 having a plurality of relays R1-R6 provided in one-to-one correspondence with the plurality of digital signals D1-D6, and an external line terminal block 30 having a plurality of first terminals T101-T130 connected to some or all of the output terminals 201-205 of the plurality of relays R1-R6. The power receiving and distribution device 1 includes a plurality of relays R1-R6 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.

[0033] 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 a 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 a second cable C2. Here, it is preferable that the control board 20 includes the third connector CN3. According to this embodiment, the control device 10 and the first cable C1 are connected to each other using a connector, so that the number of steps required to assemble the power receiving and distributing device 1 can be reduced. Also, the number of 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.

[0034] 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 voltage transformer VT and a 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 embodiment, 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 prevented from being superimposed on the analog signal.

[0035] The measurement device may be, for example, a current transformer CT for measurement, which measures the current flowing through the power supply lines L1 to L3, and outputs 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 as the measurement signals. 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.

[0036] It is preferable that the measurement device 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 indicates the magnitude of the current or the magnitude of the voltage.

[0037] The measurement device is preferably a voltage transformer VT that measures the voltages of the power supply lines L1 to L3, and the measurement signal is preferably an output voltage Vout obtained by attenuating the voltages of the power supply lines L1 to L3 according to a transformation ratio. According to this embodiment, the control device 10 can receive the output voltage Vout.

[0038] 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 a comparison result between the voltage value of the measured voltage Vs and a reference voltage value, and the undervoltage detection signal is preferably included in a plurality of digital signals. According to this embodiment, when the power supply lines L1 to L3 are low, the undervoltage detection signal can be output to a plurality of monitoring devices, so that protection coordination can be performed using a plurality of monitoring devices.

[0039] The measurement device is preferably a current transformer CT for measuring the current of 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 a current transformation ratio. According to this embodiment, the control device 10 can take in the output current Iout.

[0040] 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 a plurality of digital signals. According to this embodiment, when the current flowing through the power supply lines L1-L3 is excessive, the overcurrent detection signal can be output to a plurality of monitoring devices, so that protection coordination can be performed using a plurality of monitoring devices.

[0041] 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 using 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.

[0042] 2. Variations (1) In the above-described embodiment, the zero-phase voltage detector ZPD is used as an example of a measuring device. Although a current transformer CT and a voltage transformer VT are illustrated, the present disclosure is not limited thereto. The measuring device may be any device that measures a physical quantity related to the distribution of power. For example, the measuring device may be a zero-phase current transformer that detects a ground fault current.

[0043] (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 thereto. For example, a vacuum contactor may be used as a circuit breaker.

[0044] (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. Meanwhile, 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 with 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.

[0045] (3) In the above-described embodiment, the first cable C1 includes the first individual cable C11 and the 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 the third individual cable C21 and the 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.

[0046] (4) In the above-described embodiment, all of the output terminals T201-T205 of the relays R1-R6 are connected to the first terminals T101-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-T205 of the relays R1-R6 may be connected to some of the first terminals T101-T130 via the third connector CN3 and the second cable C2. For example, in the power receiving and distributing 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-T205 of the relay R5 and the third connector CN3. In this case, the output terminals T201-T205 of the relay R5 are not connected to the first terminals T121-T125. [Explanation of symbols]

[0047] 1...power receiving and distributing 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...relays, 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 terminal, Ta21~Ta24, Tb21~Tb24...second terminal, La~Lf...crossover wiring.

Claims

1. A circuit breaker provided in a power supply line for supplying power; A plurality of digital signals that control the opening and closing of the circuit breaker and indicate the electrical state of the power supply line A control device that outputs A control board having a plurality of relays provided in one-to-one correspondence with the plurality of digital signals. and, an external line having a plurality of first terminals connected to some or all of the output terminals of the plurality of relays; A terminal block, 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 receiving and distribution equipment.

2. A circuit breaker provided in a power supply line for supplying power; A plurality of digital signals that control the opening and closing of the circuit breaker and indicate the electrical state of the power supply line A control device that outputs A control board having a plurality of relays provided in one-to-one correspondence with the plurality of digital signals. and, an external line having a plurality of first terminals connected to some or all of the output terminals of the plurality of relays; A terminal block, 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 receiving and distribution equipment

3. the control device includes a first connector to which the plurality of digital signals are supplied; The control board has a second connector connected to the first connector via a first cable. Equipped with 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.

4. 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 .

5. 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 .

6. 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 .

7. The control device includes: an attenuation circuit that outputs a measurement voltage obtained by attenuating the output voltage according to an attenuation ratio; Based on a comparison result between the voltage value of the measured voltage and a reference voltage value, a control circuit for generating an undervoltage detection signal that becomes active when The undervoltage detection signal is included in the plurality of digital signals. The power receiving and distributing device according to claim 6.

8. 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 .

9. The control device includes: a transformer that outputs a measurement current obtained by attenuating the output current according to an attenuation ratio; When the measured current value exceeds the reference current value, an overcurrent detection signal is generated. and a control circuit for generating a 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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