WO2020217836A1 - Switchgear and switchgear assembly - Google Patents

Switchgear and switchgear assembly Download PDF

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Publication number
WO2020217836A1
WO2020217836A1 PCT/JP2020/013539 JP2020013539W WO2020217836A1 WO 2020217836 A1 WO2020217836 A1 WO 2020217836A1 JP 2020013539 W JP2020013539 W JP 2020013539W WO 2020217836 A1 WO2020217836 A1 WO 2020217836A1
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WO
WIPO (PCT)
Prior art keywords
switch gear
power receiving
feeder
current sensor
switch
Prior art date
Application number
PCT/JP2020/013539
Other languages
French (fr)
Japanese (ja)
Inventor
孝幸 甲斐
誠 金丸
堀之内 克彦
透 木村
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to DE112020002076.2T priority Critical patent/DE112020002076T5/en
Priority to JP2020545746A priority patent/JP6896184B2/en
Publication of WO2020217836A1 publication Critical patent/WO2020217836A1/en

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02Details
    • H01H33/26Means for detecting the presence of an arc or other discharge
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327Testing of circuit interrupters, switches or circuit-breakers
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/50Means for detecting the presence of an arc or discharge
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00Details of emergency protective circuit arrangements
    • H02H1/0007Details of emergency protective circuit arrangements concerning the detecting means
    • H02H1/0015Using arc detectors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/26Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/28Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus

Definitions

  • the present application relates to a switch gear and a switch gear group equipped with an internal arc detector.
  • Patent Document 1 An internal arc suppression system that detects the light emission of the internal arc and extinguishes it at high speed is disclosed.
  • the light emission of the internal arc is detected by the optical sensor, so if the lighting and the flash of the camera are arranged in the surroundings, it may malfunction. There is a problem that ground faults and correlated short circuits that occur in the distribution system cannot be accurately captured.
  • the present application has been made to solve the above problems, and an object of the present application is to obtain a switch gear and a switch gear group capable of detecting an internal arc without malfunction.
  • the switch gear of the present application has a power receiving circuit including a power receiving side circuit breaker, a power receiving side current sensor, and a ground switch, and connects a load consisting of a power receiving panel that receives power supply from the outside and a feeder side circuit breaker and a feeder side current sensor. It is equipped with a feeder board that has a load circuit to supply power from the power receiving board, and when the difference obtained by subtracting the current value of the feeder side current sensor from the current value of the power receiving side current sensor is detected, the internal arc It is equipped with a detector that determines that it has occurred.
  • FIG. It is a single wire connection diagram of the switch gear which concerns on Embodiment 1.
  • FIG. It is a figure which shows the suppression flow of the internal arc which concerns on Embodiment 1.
  • FIG. It is a single wire connection diagram of the switch gear group which concerns on Embodiment 2.
  • FIG. It is a figure which shows the suppression flow of the internal arc which concerns on Embodiment 2.
  • FIG. 1 is a single-line connection diagram showing the configuration of the switch gear 10 of the present embodiment.
  • the switch gear 10 is composed of a power receiving board 1 surrounded by a broken line at the upper part and feeder boards 9a, 9b, 9c surrounded by a broken line at the lower part.
  • the power receiving board 1 is located on the power supply side of the switch gear 10, and serves as a power receiving side circuit 14 with a power receiving side circuit breaker 2, a power receiving side current sensor 4 adjacent to the feeder side of the power receiving side circuit breaker 2, and a grounding switch 3. It has.
  • the power receiving side current sensor 4 is connected to the detector 8 like the feeder side current sensor 6 described later, measures the current value, and inputs the measurement result to the detector 8.
  • the feeder boards 9a, 9b, and 9c are connected to a plurality of load circuits 15 that branch the wiring connected from the power receiving board 1 and supply power to the load 7.
  • Each load circuit 15 has a structure of connecting to the load 7 via the feeder side circuit breaker 5 and the feeder side current sensor 6, and as described above, the current value measured by the feeder side current sensor 6 is It is input to the detector 8.
  • the feeder side circuit breaker 5 is described as a switch in FIG. 1, the present invention is not limited to this, and a fuse can also be used.
  • the detector 8 has a function of performing an operation based on the measurement results of each current sensor to detect the presence or absence of an internal arc, and outputting a signal to the ground switch 3 as described later. ..
  • these functions may be provided as a form dispersed in a plurality of devices.
  • a configuration is shown in which three feeder boards 9a, 9b, and 9c in which a load circuit 15 is formed are connected to the power receiving board 1. This is an example, and the number of feeder boards 9a, 9b, 9c connected can be changed.
  • FIG. 2 shows the suppression flow of the internal arc in the present embodiment.
  • the current value of the power receiving side current sensor 4 is Iu
  • the current value of the feeder side current sensor 6 is Id.
  • the maximum current value of the current sensor is set to Imax, and when the current value of the current sensor does not reach this maximum current value Imax, it is determined that the current is operating correctly without being saturated.
  • step S101 it is confirmed that the current value Id of the feeder side current sensor 6 is smaller than the maximum current value Imax, and it is considered that the current value Id is not saturated.
  • step S102 the difference between the current value Iu of the power receiving side current sensor 4 and the sum ⁇ Id of the current values of all the feeder side current sensors 6 is calculated by the detector 8.
  • the detector 8 When no ground fault or short circuit between phases occurs, the sum ⁇ Id of the current value Iu of the power receiving side current sensor 4 and the current value of all the feeder side current sensors 6 becomes equal.
  • a ground fault or a phase short circuit occurs and an internal arc is generated, a current flows through the arc, so that the sum ⁇ Id of the current values of all the feeder side current sensors decreases.
  • the difference in the current value between the power receiving side current sensor 4 and the feeder side current sensor 6 is obtained by the detector 8, and when it exceeds a certain threshold value, a signal is sent to the ground switch 3. Is output to put it in the "closed” state. Therefore, unlike the case where the internal arc is detected by the conventional optical evaluation, the internal arc can be reliably suppressed without causing a malfunction due to the influence of the disturbance.
  • the operating time of the circuit breaker needs to be delayed by the higher circuit breaker for protection coordination with the lower circuit breaker. Therefore, when an internal arc is generated, the switch gear is seriously damaged by the time the current is cut off, but the internal arc is suppressed until the current is cut off by grounding at high speed before the circuit breaker operates. To do.
  • FIG. 3 shows the configuration of the switch gear group 60 using the switch gears 10 and 30 of the present embodiment in a single wire connection diagram, and shows the first switch gear 10 located on the left side and the first switch gear 10 located on the right side.
  • the second switch gear 30 shows a structure arranged via the connection portion 50.
  • the configurations of the first switch gear 10 and the second switch gear 30 are the same, and the first switch gear is the power receiving side circuit breaker 2, the grounding switch 3, and the power receiving side current sensor 4. It includes a power receiving circuit 14 including a power receiving circuit 14, a load circuit 15 composed of a feeder side circuit breaker 5 and a feeder side current sensor 6 and connected to a load 7, and a detector 8 to which each current sensor is connected.
  • the second switch gear 30 is also connected to the load 27 including the power receiving circuit 34 including the power receiving side circuit breaker 22, the grounding switch 23 and the power receiving side current sensor 24, and the feeder side circuit breaker 25 and the feeder side current sensor 26. It includes a load circuit 35 and a detector 28 to which each current sensor is connected.
  • the second switch gear 30 is also composed of the power receiving board 21 and the feeder boards 29a, 29b, 29c.
  • the feeder side circuit breakers 5 and 25 are described as switches in FIG. 3, the present invention is not limited to this, and a fuse can also be used.
  • connection portion 50 arranged between the two switch gears 10 and 30 includes a connection circuit 43 including a connection breaker 41 and a connection current sensor 42, and the connection current sensor 42 is the first switch gear 10. It is connected to both the detector 8 of the above and the detector 28 of the second switch gear 30, and the current value obtained by the connection current sensor 42 can be input to any of the detectors 8 and 28. In the present embodiment, the detectors 8 and 28 are used to determine whether or not an internal arc is generated, as in the first embodiment.
  • the present embodiment is different from the first embodiment in that it has a plurality of switch gears 10 and 30 and a connecting portion 50 between them to form a switch gear group 60.
  • a switch gear group in which the number of switch gears 10 and 30 is arranged is shown as an example, but the present invention is not limited to this, and three or more switch gears 10 and 30 are arranged between the switch gears 10 and 30.
  • a switch gear group 60 in which the connection portion 50 is arranged can also be used.
  • a switch gear group 60 having a configuration using two switch gears 10 and 30 as described above will be described as an example.
  • the switch gear group 60 including the first switch gear 10 and the second switch gear 30 shown in FIG. 3 is in the “open” state of the connection breaker 41 arranged in the connection portion 50 during normal driving.
  • the first switch gear 10 and the second switch gear 30 can be separated and used as individual switch gears.
  • the supplied electric power is divided into three, and each of them is connected to a load 7 such as a motor to drive the electric power.
  • the second switch gear 30 is also supplied with electric power via the power receiving side circuit 34, and after branching, is connected to a load 27 such as a motor to drive the second switch gear 30.
  • connection breaker 41 of the connection unit 50 is set to the "closed" state.
  • the suppression flow of the internal arc shown in FIGS. 4A and 4B will be described by using an example in which the power supply source of the first switch gear 10 is stopped and the circuit breaker 41 for connection is driven in the “closed” state. To do.
  • the second switch gear 30 is stopped, it can be handled basically in the same manner.
  • FIG. 4A and 4B show the suppression flow of the internal arc of the switch gear group 60 in this embodiment.
  • FIG. 4A shows the flow of the first switch gear 10 in the detector 8
  • FIG. 4B shows the flow of the second switch gear 30 in the detector 28.
  • there is no power supply to the power receiving side circuit 14 of the first switch gear 10 and the load circuit 15 of the first switch gear 10 is connected from the second switch gear 30 via the connection portion 50.
  • a configuration in which electric power is supplied will be described as an example.
  • the current values of the power receiving side current sensors 4 and 24 arranged in the power receiving side circuits 14 and 34 of the first and second switch gears 10 and 30 constituting the switch gear group 60 are set respectively.
  • the sum of the current values of the plurality of feeder side current sensors 6 and 26 of the Iu1 and Iu2, the first and second switch gears 10 and 30, is represented by ⁇ Id1 and ⁇ Id2.
  • the maximum current value of each feeder side current sensor is Imax
  • the current value of the connection current sensor 42 arranged in the connection portion 50 is represented by Im.
  • step S201 of FIGS. 4A and 4B the current values Id1 and Id2 of the respective feeder side current sensors 6 and 26 are smaller than the maximum current value Imax, and it is considered that they are operating correctly, and the next step S202 or step S203. Proceed to.
  • step S202 from the current value Im of the connection current sensor 42 that has flowed to the feeder panel of the first switch gear 10 through the connection portion 50, the feeder side current sensor 6 arranged in the first switch gear 10 The difference obtained by subtracting the sum of the current values of ⁇ Id1 is obtained.
  • the detector 8 calculates whether or not the threshold value Is1 has been exceeded, and determines the presence or absence of the difference.
  • step S204 a signal is output from the detector 8 to the ground switch 3 included in the first switch gear 10 to bring it into a “closed” state, and the current to the internal arc is cut off. As a result, the internal arc is suppressed and the flow of FIG. 4A ends.
  • both or one of the connection breaker 41 of the connection unit 50 and the power receiving side circuit breaker 22 of the power receiving circuit 34 is set to "open" to supply power to the load circuit 15 of the feeder boards 9a, 9b, 9c. Breaking off is also effective in suppressing the internal arc.
  • the interruption time from the opening command for interrupting the power supply to the actual interruption is within 3 cycles of the commercial frequency.
  • This is for protection coordination, and if the accident location is not specified, it is necessary to open the poles in order from the bottom of the system in order to minimize the range that limits the power supply, and the circuit breaker at the top of the system has an open pole command. It takes a long time to emit.
  • the accident occurrence location can be specified, it does not require time for protection coordination.
  • a method of cutting off the power supply by opening both or one of the connection breaker 41 of the connection unit 50 and the power receiving side circuit breaker 22 of the power receiving circuit 34 is a method of extinguishing the internal arc by grounding. Although it takes a long time to extinguish the arc, the existing connection breaker 41 and the power receiving side circuit breaker 22 can be used as they are, and the cost reduction effect is high.
  • step S203 it is confirmed whether the current flowing through the load circuit 35 and the connection circuit 43 of the second switch gear 30 has generated an internal arc due to a ground fault or an interphase short circuit.
  • step S203 of FIG. 4B the current Im flowing from the current value Iu2 of the power receiving side current sensor 24 of the second switch gear to the first switch gear through the connection circuit 43 of the connection portion 50 and the second switch gear 30
  • the difference obtained by subtracting the sum ⁇ Id2 of the current values of the current values of the feeder side current sensors 26 arranged in the detector 28 is obtained by the detector 28.
  • the detector 28 calculates whether or not the threshold value Is2 has been exceeded, and determines whether or not there is a difference.
  • step S205 a signal for closing the grounding switch 23 is output from the detector 28 to the grounding switch 23 included in the second switch gear 30, and a current to the internal arc is output. To shut off. As a result, the internal arc is suppressed and the flow is terminated. If the threshold value Is2 is not exceeded, it is determined that no internal arc has been generated, and the flow is terminated as it is.
  • the ground switches 3 and 23 are operated by calculating the current value between the power receiving side current sensor 24 and the connection current sensor 42 and the feeder side current sensors 6 and 26 by the detectors 8 and 28. It is in the "closed” state. Therefore, a malfunction does not occur as in the case of detecting an arc by the conventional optical evaluation. In addition, the "closed" state can be set at high speed, and damage to the device due to the internal arc can be reduced.
  • the flows of the two detectors 8 and 28 are shown in FIGS. 4A and 4B, respectively. It can be said that these are the same flow, not different flows. That is, when the flow of FIG. 4B is applied to the detector 8 of the first switch gear 10, the subscript is “1” representing the first switch gear, and step S201 of FIG. 4B is Id1 ⁇ Imax. It becomes the same as the description of 4A. Further, in step S203, Iu1-Im- ⁇ Id1> Is1. Since no power is supplied to the power receiving circuit 14 of the first switch gear 10, the current value Iu1 of the power receiving side current sensor 4 becomes zero, and Im has the opposite sign, so Im- ⁇ Id1> Is1. It becomes the same as S202. From the above, the flow of FIG. 4B can be commonly used by the two detectors 8 and 28.
  • step S202 shown in FIG. 4A it is determined whether or not there is a decrease in the current value exceeding the threshold value Is1, and then in step S203 shown in FIG. 4B. It was determined whether or not there was a decrease in the current value exceeding the threshold value Is2. Since this series of determinations is performed in cooperation with the detector 8 of the first switch gear 10 and the detector 28 of the second switch gear 30, the time required for detection becomes longer, but any of the switch gears 10 and 30 It is possible to detect whether a ground fault or a phase-to-phase short circuit has occurred and an internal arc has occurred. Further, the internal arc is suppressed by shutting off the power supply based on the detected result, or by closing the grounding switches 3 and 23 of the corresponding switch gears 10 and 30 at the same time or following the power supply cutoff. Can be done.
  • step S202 shown in FIG. 4A and step S203 shown in FIG. 4B can be treated as independent processes. That is, the generation of the internal arc can be detected by omitting the determination in step S202 shown in FIG. 4A and performing only the determination in step S203 in FIG. 4B. In this case, unlike the case where both the determinations of steps S202 and S203 are performed as a series, it is not possible to determine which switch gears 10 and 30 generate the internal arc. It can be detected that an internal arc is generated in any of the second switch gears 10 and 30.
  • step S202 in which step S202 is omitted and only the determination in step S203 is performed, the two detectors 8 and 28 arranged in the first switch gear 10 and the second switch gear 30 are used. There is no need to coordinate, the two detectors 8 and 28 determine in parallel and control the ground switches 3 and 23. Therefore, the generation of the internal arc can be detected at high speed, and the grounding switches 3 and 23 can be operated in a short time to suppress the internal arc. Further, since it is not necessary to send and receive data between the detectors 8 and 28, wiring saving can be achieved.
  • Iu2-Im- ⁇ Id2> Is2 was shown. This means that Iu2 positively transfers the current flowing from the upper side to the lower side of the second switch gear, and Im changes from the second switch gear to the first switch gear. In this case, the flowing current is positive, and Id2 is the positive current flowing from the upper side to the lower side of the second switch gear. On the other hand, Iu2 is positive for the current flowing from the upper side to the lower side of the second switch gear, Im is negative for the current flowing from the second switch gear to the first switch gear, and Id2 is negative for the current flowing from the upper side to the lower side of the second switch gear.
  • step S203 can be set to Iu2 + Im + ⁇ Id2. That is, by changing the polarity of the sensor, the same processing can be performed only by addition, and when implemented in an analog circuit, the circuit configuration can be simplified. Further, since the polarity of the sensor may be set in advance, the first and second switch gears can be judged by the same process.
  • the hardware 51 constituting the detectors 8 and 28 includes a processor 52 and a storage device 53.
  • the storage device includes a volatile storage device such as a random access memory and a non-volatile auxiliary storage device such as a flash memory. Further, an auxiliary storage device of a hard disk may be provided instead of the flash memory.
  • the processor 52 executes the program input from the storage device 53.
  • a program is input from the auxiliary storage device to the processor 52 via the volatile storage device. Further, the processor 52 may output data such as a calculation result to the volatile storage device of the storage device 53, or may store the data in the auxiliary storage device via the volatile storage device.
  • steps S101 and S102 shown in FIG. 2 steps S201 and S202 shown in FIG. 4A, and steps S201 and S203 shown in FIG. 4B are in the same order, respectively. Similar results can be obtained even if they are replaced and carried out.

Abstract

Achieved is a switchgear (10) that, without mistaken operation, can detect an occurrence of internal arcing. The switchgear (10) is characterized by: being provided with an incoming panel (1) that receives power supplied from the outside and that includes an incoming circuit (14) composed of an incoming-end circuit breaker (2), an incoming-end current sensor (4) and an earthing switch (3), and feeder panels (9a, 9b, 9c) that include load circuits (15) which are composed of feeder-end circuit breakers (5) and feeder-end current sensors (6) and which are connected to loads (7), and that receive power supplied from the incoming panel (1); and being further provided with a detector (8) that determines that internal arcing has occurred if a difference is detected, the difference being the result of subtracting a current value at a feeder-end current sensor (6) from a current value at the incoming-end current sensor (4).

Description

スイッチギヤ及びスイッチギヤ群Switch gear and switch gear group
 本願は、内部アークの検出器を備えたスイッチギヤ及びスイッチギヤ群に関するものである。 The present application relates to a switch gear and a switch gear group equipped with an internal arc detector.
 スイッチギヤ内の短絡事故等により、内部アークが発生した場合、急激に装置内圧力が上昇し、同時に温度上昇も生じる。そのため、内部アークによる被害を防止するために、内部アークの発光を検知し、高速に消滅させる内部アークの抑制システムが開示されている(特許文献1)。 When an internal arc is generated due to a short circuit accident in the switch gear, the pressure inside the device rises sharply, and at the same time, the temperature also rises. Therefore, in order to prevent damage caused by the internal arc, an internal arc suppression system that detects the light emission of the internal arc and extinguishes it at high speed is disclosed (Patent Document 1).
特開平5-297055号公報Japanese Unexamined Patent Publication No. 5-297055
 従来の、光センサを用いた内部アークの検出器では、内部アークの発光を光センサで検知するため、照明及びカメラのフラッシュ等が周囲に配置されている場合には、誤動作することが考えられ、配電系統内で発生した地絡及び相関短絡等を正確に捉えることができないという問題があった。 In the conventional internal arc detector using an optical sensor, the light emission of the internal arc is detected by the optical sensor, so if the lighting and the flash of the camera are arranged in the surroundings, it may malfunction. There is a problem that ground faults and correlated short circuits that occur in the distribution system cannot be accurately captured.
 本願は、上記のような課題を解決するためになされたものであって、内部アークを誤動作なく検出することができるスイッチギヤ及びスイッチギヤ群を得ることを目的とする。 The present application has been made to solve the above problems, and an object of the present application is to obtain a switch gear and a switch gear group capable of detecting an internal arc without malfunction.
 本願のスイッチギヤは、受電側遮断器及び受電側電流センサ及び接地スイッチからなる受電回路を有し、外部から電力供給を受ける受電盤と、フィーダ側遮断器及びフィーダ側電流センサからなり負荷を接続する負荷回路を有し、受電盤から電力供給を受けるフィーダ盤と、を備え、受電側電流センサの電流値から、フィーダ側電流センサの電流値を減じた差異を検出した場合に、内部アークの発生と判断する検出器を備えたものである。 The switch gear of the present application has a power receiving circuit including a power receiving side circuit breaker, a power receiving side current sensor, and a ground switch, and connects a load consisting of a power receiving panel that receives power supply from the outside and a feeder side circuit breaker and a feeder side current sensor. It is equipped with a feeder board that has a load circuit to supply power from the power receiving board, and when the difference obtained by subtracting the current value of the feeder side current sensor from the current value of the power receiving side current sensor is detected, the internal arc It is equipped with a detector that determines that it has occurred.
 本願によると、内部アークの発生を誤動作なく検出するスイッチギヤを得ることができる。 According to the present application, it is possible to obtain a switch gear that detects the generation of an internal arc without malfunction.
実施の形態1に係るスイッチギヤの単線結線図である。It is a single wire connection diagram of the switch gear which concerns on Embodiment 1. FIG. 実施の形態1に係る内部アークの抑制フローを示す図である。It is a figure which shows the suppression flow of the internal arc which concerns on Embodiment 1. FIG. 実施の形態2に係るスイッチギヤ群の単線結線図である。It is a single wire connection diagram of the switch gear group which concerns on Embodiment 2. FIG. 実施の形態2に係る内部アークの抑制フローを示す図である。It is a figure which shows the suppression flow of the internal arc which concerns on Embodiment 2. 実施の形態2に係る内部アークの抑制フローを示す図である。It is a figure which shows the suppression flow of the internal arc which concerns on Embodiment 2. 実施の形態1及び2に係る検出器のハードウェア図である。It is a hardware diagram of the detector which concerns on Embodiments 1 and 2.
 実施の形態の説明及び各図において、同一の符号を付した部分は、同一又は相当する部分を示すものである。 In the description of the embodiment and each figure, the parts with the same reference numerals indicate the same or corresponding parts.
実施の形態1.
 本実施の形態について、図1及び図2を用いて説明する。
<スイッチギヤの概略構成>
 図1は、本実施の形態のスイッチギヤ10の構成を単線結線図で示したものである。
 スイッチギヤ10は、上部の破線で囲んだ受電盤1と、下部の破線で囲んだフィーダ盤9a、9b、9cとで構成される。
Embodiment 1.
The present embodiment will be described with reference to FIGS. 1 and 2.
<Outline configuration of switch gear>
FIG. 1 is a single-line connection diagram showing the configuration of the switch gear 10 of the present embodiment.
The switch gear 10 is composed of a power receiving board 1 surrounded by a broken line at the upper part and feeder boards 9a, 9b, 9c surrounded by a broken line at the lower part.
 受電盤1は、スイッチギヤ10の電力供給側に位置し、受電側回路14として、受電側遮断器2と、受電側遮断器2のフィーダ側に隣接する受電側電流センサ4と接地スイッチ3とを備えている。受電側電流センサ4は、後述するフィーダ側電流センサ6と同様に、検出器8に接続されており、電流値を測定して測定結果を検出器8へ入力する。 The power receiving board 1 is located on the power supply side of the switch gear 10, and serves as a power receiving side circuit 14 with a power receiving side circuit breaker 2, a power receiving side current sensor 4 adjacent to the feeder side of the power receiving side circuit breaker 2, and a grounding switch 3. It has. The power receiving side current sensor 4 is connected to the detector 8 like the feeder side current sensor 6 described later, measures the current value, and inputs the measurement result to the detector 8.
 フィーダ盤9a、9b、9cは、受電盤1から接続された配線を分岐し、負荷7へ給電する複数の負荷回路15が接続されている。各々の負荷回路15は、フィーダ側遮断器5、フィーダ側電流センサ6とを経て、負荷7へ接続する構造となっており、上述のように、フィーダ側電流センサ6で測定した電流値は、検出器8へ入力される。なお、図1においてフィーダ側遮断器5はスイッチとして記載されているが、これに限定するものではなく、ヒューズも用いることができる。 The feeder boards 9a, 9b, and 9c are connected to a plurality of load circuits 15 that branch the wiring connected from the power receiving board 1 and supply power to the load 7. Each load circuit 15 has a structure of connecting to the load 7 via the feeder side circuit breaker 5 and the feeder side current sensor 6, and as described above, the current value measured by the feeder side current sensor 6 is It is input to the detector 8. Although the feeder side circuit breaker 5 is described as a switch in FIG. 1, the present invention is not limited to this, and a fuse can also be used.
 本実施の形態において、検出器8は、各電流センサの測定結果に基づいて演算を実施して内部アークの発生の有無を検知し、後述のように接地スイッチ3に対する信号を出力する機能を有する。ただし、一体としてこれらの機能を有する必要はなく、複数の機器に分散した形態として、これらの機能を有してもよい。
 また、本実施の形態においては、受電盤1に負荷回路15が各々形成されたフィーダ盤9a、9b、9cが3つ接続された構成を示した。これは一例であり、接続されるフィーダ盤9a、9b、9cの数は変えることができる。
In the present embodiment, the detector 8 has a function of performing an operation based on the measurement results of each current sensor to detect the presence or absence of an internal arc, and outputting a signal to the ground switch 3 as described later. .. However, it is not necessary to have these functions as a whole, and these functions may be provided as a form dispersed in a plurality of devices.
Further, in the present embodiment, a configuration is shown in which three feeder boards 9a, 9b, and 9c in which a load circuit 15 is formed are connected to the power receiving board 1. This is an example, and the number of feeder boards 9a, 9b, 9c connected can be changed.
 受電盤1に配置された受電側回路14の受電側遮断器2が「閉」状態の場合、スイッチギヤ10の上部から、3つのフィーダ盤9a、9b、9cに電力供給され、フィーダ盤9a、9b、9cに配置された負荷回路15のうち、フィーダ側遮断器5が「閉」状態の負荷回路15に接続された負荷7に電力が供給され、稼働状態となる。 When the power receiving side circuit breaker 2 of the power receiving side circuit 14 arranged on the power receiving board 1 is in the “closed” state, power is supplied from the upper part of the switch gear 10 to the three feeder boards 9a, 9b, 9c, and the feeder board 9a, Of the load circuits 15 arranged in 9b and 9c, power is supplied to the load 7 connected to the load circuit 15 in the “closed” state of the feeder side circuit breaker 5, and the load 7 is put into an operating state.
<内部アークの抑制フロー>
 図2に本実施の形態での内部アークの抑制フローを示す。
 本実施の形態においては、一例として、3つの負荷回路15のフィーダ側遮断器5がすべて「閉」状態の場合について述べる。なお、受電側電流センサ4の電流値はIu、フィーダ側電流センサ6の電流値はIdとする。また、電流センサの最大電流値をImaxとし、電流センサの電流値がこの最大電流値Imaxに至っていない場合に、電流が飽和することなく正しく動作していると判断する。
<Internal arc suppression flow>
FIG. 2 shows the suppression flow of the internal arc in the present embodiment.
In the present embodiment, as an example, a case where all the feeder side circuit breakers 5 of the three load circuits 15 are in the “closed” state will be described. The current value of the power receiving side current sensor 4 is Iu, and the current value of the feeder side current sensor 6 is Id. Further, the maximum current value of the current sensor is set to Imax, and when the current value of the current sensor does not reach this maximum current value Imax, it is determined that the current is operating correctly without being saturated.
 まず、ステップS101において、最大電流値Imaxより、フィーダ側電流センサ6の電流値Idが小さいことを確認し、飽和していないとみなす。
 次に、ステップS102において、受電側電流センサ4の電流値Iuと全フィーダ側電流センサ6の電流値の和ΣIdとを差を検出器8により演算する。地絡及び相間短絡が生じていない場合は、受電側電流センサ4の電流値Iuと全フィーダ側電流センサ6の電流値の和ΣIdは等しくなる。しかし、地絡及び相間短絡が生じ、内部アークが発生すると、アークを介して電流が流れるため、全フィーダ側電流センサの電流値の和ΣIdは低下する。
First, in step S101, it is confirmed that the current value Id of the feeder side current sensor 6 is smaller than the maximum current value Imax, and it is considered that the current value Id is not saturated.
Next, in step S102, the difference between the current value Iu of the power receiving side current sensor 4 and the sum ΣId of the current values of all the feeder side current sensors 6 is calculated by the detector 8. When no ground fault or short circuit between phases occurs, the sum ΣId of the current value Iu of the power receiving side current sensor 4 and the current value of all the feeder side current sensors 6 becomes equal. However, when a ground fault or a phase short circuit occurs and an internal arc is generated, a current flows through the arc, so that the sum ΣId of the current values of all the feeder side current sensors decreases.
 そこで、受電側電流センサ4の電流値Iuから、全フィーダ側電流センサの電流値の和ΣIdを減じた差異が検出可能であった場合、内部アークが生じていると判断することができる。さらに、この差異の検出の信頼性を高めるために、電流値の差異が一定のしきい値Ithを超えた場合に、内部アークが発生したとみなすこともできる。
 内部アークが生じていると判断した場合、ステップS103において、受電側回路14の接地スイッチ3へ信号を出力し「閉」状態としてフローを終了する。
Therefore, if it is possible to detect a difference obtained by subtracting the sum ΣId of the current values of all the feeder side current sensors from the current value Iu of the power receiving side current sensor 4, it can be determined that an internal arc is generated. Further, in order to improve the reliability of detection of this difference, it can be considered that an internal arc has occurred when the difference between the current values exceeds a certain threshold value Is.
When it is determined that an internal arc is generated, a signal is output to the ground switch 3 of the power receiving side circuit 14 in step S103, the flow is terminated in the “closed” state.
 本実施の形態においては、受電側電流センサ4とフィーダ側電流センサ6との間の電流値の差異を検出器8で求め、一定のしきい値以上となった場合に、接地スイッチ3に信号を出力し「閉」状態とする。そのため、従来の光学的評価により内部アークを検知する場合のように外乱の影響により誤動作を生じることがなく、確実に内部アークを抑制することができる。 In the present embodiment, the difference in the current value between the power receiving side current sensor 4 and the feeder side current sensor 6 is obtained by the detector 8, and when it exceeds a certain threshold value, a signal is sent to the ground switch 3. Is output to put it in the "closed" state. Therefore, unlike the case where the internal arc is detected by the conventional optical evaluation, the internal arc can be reliably suppressed without causing a malfunction due to the influence of the disturbance.
 また、遮断器の動作時間は下位遮断器との保護協調のために上位遮断器ほど遅れて動作させる必要がある。そのため、内部アークが発生した場合、電流が遮断されるまでに、スイッチギヤが大きく損傷してしまうが、遮断器が動作する前に高速に接地することで電流が遮断されるまで内部アークを抑制する。 In addition, the operating time of the circuit breaker needs to be delayed by the higher circuit breaker for protection coordination with the lower circuit breaker. Therefore, when an internal arc is generated, the switch gear is seriously damaged by the time the current is cut off, but the internal arc is suppressed until the current is cut off by grounding at high speed before the circuit breaker operates. To do.
実施の形態2.
 本実施の形態について、図3、図4A及び図4Bを用いて説明する。
<スイッチギヤ群の概略構成>
 図3は、本実施の形態のスイッチギヤ10、30を用いたスイッチギヤ群60の構成を単線結線図で示したものであり、左側に位置する第一のスイッチギヤ10と右側に位置する第二のスイッチギヤ30が、接続部50を介して配置された構造を示している。
Embodiment 2.
The present embodiment will be described with reference to FIGS. 3, 4A and 4B.
<Outline configuration of switch gear group>
FIG. 3 shows the configuration of the switch gear group 60 using the switch gears 10 and 30 of the present embodiment in a single wire connection diagram, and shows the first switch gear 10 located on the left side and the first switch gear 10 located on the right side. The second switch gear 30 shows a structure arranged via the connection portion 50.
 本実施の形態では、第一のスイッチギヤ10と第二のスイッチギヤ30の各々の構成は同じであり、第一のスイッチギヤが、受電側遮断器2、接地スイッチ3及び受電側電流センサ4からなる受電回路14と、フィーダ側遮断器5、フィーダ側電流センサ6からなり負荷7と接続した負荷回路15と、さらに各電流センサが接続される検出器8を備えている。
 一方、第二のスイッチギヤ30も、受電側遮断器22、接地スイッチ23及び受電側電流センサ24からなる受電回路34と、フィーダ側遮断器25、フィーダ側電流センサ26からなり負荷27に接続した負荷回路35と、各電流センサが接続される検出器28とを備えている。
In the present embodiment, the configurations of the first switch gear 10 and the second switch gear 30 are the same, and the first switch gear is the power receiving side circuit breaker 2, the grounding switch 3, and the power receiving side current sensor 4. It includes a power receiving circuit 14 including a power receiving circuit 14, a load circuit 15 composed of a feeder side circuit breaker 5 and a feeder side current sensor 6 and connected to a load 7, and a detector 8 to which each current sensor is connected.
On the other hand, the second switch gear 30 is also connected to the load 27 including the power receiving circuit 34 including the power receiving side circuit breaker 22, the grounding switch 23 and the power receiving side current sensor 24, and the feeder side circuit breaker 25 and the feeder side current sensor 26. It includes a load circuit 35 and a detector 28 to which each current sensor is connected.
 第一のスイッチギヤ10は受電盤1とフィーダ盤9a、9b、9cで構成されているのと同様に、第二のスイッチギヤ30も受電盤21とフィーダ盤29a、29b、29cで構成されている。
 なお、図3においてフィーダ側遮断器5、25はスイッチとして記載されているが、これに限定するものではなく、ヒューズも用いることができる。
Just as the first switch gear 10 is composed of the power receiving board 1 and the feeder boards 9a, 9b, 9c, the second switch gear 30 is also composed of the power receiving board 21 and the feeder boards 29a, 29b, 29c. There is.
Although the feeder side circuit breakers 5 and 25 are described as switches in FIG. 3, the present invention is not limited to this, and a fuse can also be used.
 2つのスイッチギヤ10、30の間に配置する接続部50は、接続用遮断器41と接続用電流センサ42とからなる接続回路43を備え、接続用電流センサ42は、第一のスイッチギヤ10の検出器8と第二のスイッチギヤ30の検出器28の両者と接続されており、接続用電流センサ42で得られた電流値はいずれの検出器8、28へも入力することができる。
 本実施の形態において、検出器8、28は、実施の形態1と同様に、内部アークの発生の有無の判断に用いる。
The connection portion 50 arranged between the two switch gears 10 and 30 includes a connection circuit 43 including a connection breaker 41 and a connection current sensor 42, and the connection current sensor 42 is the first switch gear 10. It is connected to both the detector 8 of the above and the detector 28 of the second switch gear 30, and the current value obtained by the connection current sensor 42 can be input to any of the detectors 8 and 28.
In the present embodiment, the detectors 8 and 28 are used to determine whether or not an internal arc is generated, as in the first embodiment.
 本実施の形態では、複数のスイッチギヤ10、30と、各々の間に接続部50を有し、スイッチギヤ群60を構成する点で実施の形態1と異なっている。図3では、スイッチギヤ10、30の配置数が2つのスイッチギヤ群を例に示したがこれに限定されるものではなく、3つ以上のスイッチギヤ10、30を配置し、それぞれの間に接続部50を配置したスイッチギヤ群60も用いることもできる。
 本実施の形態においては、説明を容易とするために、上述のように2つのスイッチギヤ10、30を用いた構成のスイッチギヤ群60を例に説明する。
The present embodiment is different from the first embodiment in that it has a plurality of switch gears 10 and 30 and a connecting portion 50 between them to form a switch gear group 60. In FIG. 3, a switch gear group in which the number of switch gears 10 and 30 is arranged is shown as an example, but the present invention is not limited to this, and three or more switch gears 10 and 30 are arranged between the switch gears 10 and 30. A switch gear group 60 in which the connection portion 50 is arranged can also be used.
In the present embodiment, for ease of explanation, a switch gear group 60 having a configuration using two switch gears 10 and 30 as described above will be described as an example.
 図3に示した第一のスイッチギヤ10と第二のスイッチギヤ30を備えたスイッチギヤ群60は、通常の駆動時においては、接続部50に配置した接続用遮断器41を「開」状態としており、第一のスイッチギヤ10と第二のスイッチギヤ30とは切り離して、個別のスイッチギヤとして用いていることができる。 The switch gear group 60 including the first switch gear 10 and the second switch gear 30 shown in FIG. 3 is in the “open” state of the connection breaker 41 arranged in the connection portion 50 during normal driving. The first switch gear 10 and the second switch gear 30 can be separated and used as individual switch gears.
 つまり、第一のスイッチギヤ10においては、受電側回路14を経て電力が供給される。本実施の形態の場合、供給された電力は3つに分岐し、それぞれをモータ等の負荷7に接続して駆動している。また、第二のスイッチギヤ30も同様に、受電側回路34を経て電力が供給され、分岐後、モータ等の負荷27に接続して駆動している。 That is, in the first switch gear 10, power is supplied through the power receiving side circuit 14. In the case of the present embodiment, the supplied electric power is divided into three, and each of them is connected to a load 7 such as a motor to drive the electric power. Similarly, the second switch gear 30 is also supplied with electric power via the power receiving side circuit 34, and after branching, is connected to a load 27 such as a motor to drive the second switch gear 30.
 しかし、電力供給源が故障した場合、又は電力供給源の点検等を行う場合、上記の通常の駆動方法では、電力の供給を休止しているスイッチギヤに接続されている負荷は駆動することができない。そこで、接続部50の接続用遮断器41を「閉」状態とする。ここでは第一のスイッチギヤ10の電力供給源が停止し、接続用遮断器41を「閉」状態として駆動する場合を例に用いて、図4A及び図4Bに示す内部アークの抑制フローを説明する。逆に第二のスイッチギヤ30が停止した場合も基本的に同様に取り扱うことができる。 However, when the power supply source fails or when the power supply source is inspected, the load connected to the switch gear that is suspending the power supply can be driven by the above-mentioned normal driving method. Can not. Therefore, the connection breaker 41 of the connection unit 50 is set to the "closed" state. Here, the suppression flow of the internal arc shown in FIGS. 4A and 4B will be described by using an example in which the power supply source of the first switch gear 10 is stopped and the circuit breaker 41 for connection is driven in the “closed” state. To do. On the contrary, when the second switch gear 30 is stopped, it can be handled basically in the same manner.
<内部アークの抑制フロー> 
 図4A及び図4Bに本実施の形態でのスイッチギヤ群60の内部アークの抑制フローを示す。図4Aは第一のスイッチギヤ10の検出器8、図4Bは第二のスイッチギヤ30の検出器28でのフローを示している。
 本実施の形態においては、第一のスイッチギヤ10の受電側回路14には電力供給はなく、第一のスイッチギヤ10の負荷回路15には、第二のスイッチギヤ30から接続部50を介して電力が供給されている構成を例として説明する。
<Internal arc suppression flow>
4A and 4B show the suppression flow of the internal arc of the switch gear group 60 in this embodiment. FIG. 4A shows the flow of the first switch gear 10 in the detector 8, and FIG. 4B shows the flow of the second switch gear 30 in the detector 28.
In the present embodiment, there is no power supply to the power receiving side circuit 14 of the first switch gear 10, and the load circuit 15 of the first switch gear 10 is connected from the second switch gear 30 via the connection portion 50. A configuration in which electric power is supplied will be described as an example.
 図4A及び図4Bの説明において、スイッチギヤ群60を構成する第一及び第二のスイッチギヤ10、30の受電側回路14、34に配置する受電側電流センサ4、24の電流値を各々のIu1及びIu2、第一及び第二のスイッチギヤ10、30の複数のフィーダ側電流センサ6、26の各々の電流値の和をΣId1、ΣId2で表している。また、各フィーダ側電流センサの最大電流値をImaxとし、接続部50に配置された接続用電流センサ42の電流値をImで表している。 In the description of FIGS. 4A and 4B, the current values of the power receiving side current sensors 4 and 24 arranged in the power receiving side circuits 14 and 34 of the first and second switch gears 10 and 30 constituting the switch gear group 60 are set respectively. The sum of the current values of the plurality of feeder side current sensors 6 and 26 of the Iu1 and Iu2, the first and second switch gears 10 and 30, is represented by ΣId1 and ΣId2. Further, the maximum current value of each feeder side current sensor is Imax, and the current value of the connection current sensor 42 arranged in the connection portion 50 is represented by Im.
 図4A及び図4BのステップS201において、各々のフィーダ側電流センサ6、26の電流値Id1、Id2は、最大電流値Imaxより小さく、正しく動作しているとみなして、次のステップS202又はステップS203へ進む。 In step S201 of FIGS. 4A and 4B, the current values Id1 and Id2 of the respective feeder side current sensors 6 and 26 are smaller than the maximum current value Imax, and it is considered that they are operating correctly, and the next step S202 or step S203. Proceed to.
 次に、ステップS202では、接続部50を経て第一のスイッチギヤ10のフィーダ盤へ流れた接続用電流センサ42の電流値Imから、第一のスイッチギヤ10に配置されたフィーダ側電流センサ6の電流値の和ΣId1を減じた差異を求める。ここでは差異の検出の信頼性を高めるため、一定のしきい値Ith1を超えたか否かを検出器8で演算し、差異の有無を判断している。 Next, in step S202, from the current value Im of the connection current sensor 42 that has flowed to the feeder panel of the first switch gear 10 through the connection portion 50, the feeder side current sensor 6 arranged in the first switch gear 10 The difference obtained by subtracting the sum of the current values of ΣId1 is obtained. Here, in order to improve the reliability of the detection of the difference, the detector 8 calculates whether or not the threshold value Is1 has been exceeded, and determines the presence or absence of the difference.
 しきい値Ith1を超えた場合、フィーダ盤9a、9b、9c内で測定される電流値の和が低下しており、内部アークが生じているとみなす。そこで、ステップS204において、第一のスイッチギヤ10に含まれる接地スイッチ3へ信号を検出器8から出力して「閉」状態とし、内部アークへの電流を遮断する。これにより内部アークは抑制され、図4Aのフローを終了する。
 この時、接続部50の接続用遮断器41と受電回路34の受電側遮断器22の両方又はいずれか一方を「開」とし、フィーダ盤9a、9b、9cの負荷回路15への電力供給を遮断することも、内部アークの抑制には有効である。
When the threshold value Is1 is exceeded, the sum of the current values measured in the feeder boards 9a, 9b, and 9c is reduced, and it is considered that an internal arc is generated. Therefore, in step S204, a signal is output from the detector 8 to the ground switch 3 included in the first switch gear 10 to bring it into a “closed” state, and the current to the internal arc is cut off. As a result, the internal arc is suppressed and the flow of FIG. 4A ends.
At this time, both or one of the connection breaker 41 of the connection unit 50 and the power receiving side circuit breaker 22 of the power receiving circuit 34 is set to "open" to supply power to the load circuit 15 of the feeder boards 9a, 9b, 9c. Breaking off is also effective in suppressing the internal arc.
 一般に、スイッチギヤの遮断器では、電力供給を遮断する開極指令から実際に遮断するまでの遮断時間を商用周波数の3周期以内とすることが求められる。しかし、実際には短絡等の事故発生時から開極指令を発生させるまでに数秒を要する場合もある。
 これは保護協調を図るもので、事故発生箇所を特定しない場合、電力供給を制限する範囲を最小にするためシステムの下位から順に開極する必要があり、システムの上位の遮断器では開極指令を発するまでに長時間を要する。
 一方、本実施の形態においては、事故発生箇所を特定することができるため、保護協調のための時間を要しない。また、接続部50の接続用遮断器41と受電回路34の受電側遮断器22の両方又はいずれか一方を「開」として電力供給を遮断する方法は、接地により内部アークの消弧を行う方法と比較し、消弧までに長時間を要するが、既存の接続用遮断器41及び受電側遮断器22をそのまま用いることができ、コスト削減の効果が高い。 
Generally, in a switch gear circuit breaker, it is required that the interruption time from the opening command for interrupting the power supply to the actual interruption is within 3 cycles of the commercial frequency. However, in reality, it may take several seconds from the occurrence of an accident such as a short circuit until the opening command is issued.
This is for protection coordination, and if the accident location is not specified, it is necessary to open the poles in order from the bottom of the system in order to minimize the range that limits the power supply, and the circuit breaker at the top of the system has an open pole command. It takes a long time to emit.
On the other hand, in the present embodiment, since the accident occurrence location can be specified, it does not require time for protection coordination. Further, a method of cutting off the power supply by opening both or one of the connection breaker 41 of the connection unit 50 and the power receiving side circuit breaker 22 of the power receiving circuit 34 is a method of extinguishing the internal arc by grounding. Although it takes a long time to extinguish the arc, the existing connection breaker 41 and the power receiving side circuit breaker 22 can be used as they are, and the cost reduction effect is high.
 ステップS202において、しきい値Ith1を超える電流値の低下が観察されない場合、図4Bに示したステップS203において次の判断を実施することができる。
 ステップS203においては、第二のスイッチギヤ30の負荷回路35と接続回路43へ流れた電流が、地絡及び相間短絡により内部アークを生じていないかを確認する。
If no decrease in the current value exceeding the threshold value Is1 is observed in step S202, the following determination can be performed in step S203 shown in FIG. 4B.
In step S203, it is confirmed whether the current flowing through the load circuit 35 and the connection circuit 43 of the second switch gear 30 has generated an internal arc due to a ground fault or an interphase short circuit.
 図4BのステップS203では、第二のスイッチギヤの受電側電流センサ24の電流値Iu2から、接続部50の接続回路43を経て第一のスイッチギヤに流れた電流Im及び第二のスイッチギヤ30に配置されたフィーダ側電流センサ26の電流値の和ΣId2を減じた差異を検出器28で求める。しきい値Ith2を超えたか否かを検出器28で演算し、差異の有無を判断している。 In step S203 of FIG. 4B, the current Im flowing from the current value Iu2 of the power receiving side current sensor 24 of the second switch gear to the first switch gear through the connection circuit 43 of the connection portion 50 and the second switch gear 30 The difference obtained by subtracting the sum ΣId2 of the current values of the current values of the feeder side current sensors 26 arranged in the detector 28 is obtained by the detector 28. The detector 28 calculates whether or not the threshold value Is2 has been exceeded, and determines whether or not there is a difference.
 しきい値Ith2を超えた場合、ステップS205において、第二のスイッチギヤ30に含まれる接地スイッチ23へ、接地スイッチ23を「閉」としてする信号を検出器28から出力し、内部アークへの電流を遮断する。これにより内部アークを抑制され、フローを終了する。
 しきい値Ith2を超えない場合、内部アークは発生していないと判断され、そのままフローを終了する。
When the threshold value Is2 is exceeded, in step S205, a signal for closing the grounding switch 23 is output from the detector 28 to the grounding switch 23 included in the second switch gear 30, and a current to the internal arc is output. To shut off. As a result, the internal arc is suppressed and the flow is terminated.
If the threshold value Is2 is not exceeded, it is determined that no internal arc has been generated, and the flow is terminated as it is.
 本実施の形態においては、受電側電流センサ24と接続用電流センサ42及びフィーダ側電流センサ6、26との間の電流値を検出器8、28によって演算することで、接地スイッチ3、23を「閉」状態とする。そのため、従来の光学的評価によりアークを検知する場合のように誤動作を生じることがない。また、高速に「閉」状態とすることができ、内部アークによる装置の破損を少なくすることができる。 In the present embodiment, the ground switches 3 and 23 are operated by calculating the current value between the power receiving side current sensor 24 and the connection current sensor 42 and the feeder side current sensors 6 and 26 by the detectors 8 and 28. It is in the "closed" state. Therefore, a malfunction does not occur as in the case of detecting an arc by the conventional optical evaluation. In addition, the "closed" state can be set at high speed, and damage to the device due to the internal arc can be reduced.
 なお、本実施の形態において、2つの検出器8、28でのフローをそれぞれ図4A及び図4Bに記載した。これらは異なったフローではなく、同じフローということができる。
 つまり、図4Bのフローを第一のスイッチギヤ10の検出器8に適用する場合、添え字は第一のスイッチギヤを表す「1」となり、図4BのステップS201はId1<Imaxとなるため図4Aの記載と同一となる。
 また、ステップS203は、Iu1-Im-ΣId1>Ith1となる。第一のスイッチギヤ10の受電回路14には電力は供給されないので、受電側電流センサ4の電流値Iu1は零となり、Imは逆符号となるので、Im-ΣId1>Ith1となり、図4AのステップS202と同じになる。
 以上より、図4Bのフローは、2つの検出器8、28で共通して用いることができる。
In this embodiment, the flows of the two detectors 8 and 28 are shown in FIGS. 4A and 4B, respectively. It can be said that these are the same flow, not different flows.
That is, when the flow of FIG. 4B is applied to the detector 8 of the first switch gear 10, the subscript is “1” representing the first switch gear, and step S201 of FIG. 4B is Id1 <Imax. It becomes the same as the description of 4A.
Further, in step S203, Iu1-Im-ΣId1> Is1. Since no power is supplied to the power receiving circuit 14 of the first switch gear 10, the current value Iu1 of the power receiving side current sensor 4 becomes zero, and Im has the opposite sign, so Im-ΣId1> Is1. It becomes the same as S202.
From the above, the flow of FIG. 4B can be commonly used by the two detectors 8 and 28.
 本実施の形態2では、以上のように、まず図4Aに示したステップS202において、しきい値Ith1を超える電流値の低下の有無を判断し、続いて図4Bに示したステップS203において、しきい値Ith2を超える電流値の低下の有無を判断した。
 この一連の判断は、第一のスイッチギヤ10の検出器8と第二のスイッチギヤ30の検出器28を協調して行うため、検知に要する時間は長くなるものの、いずれのスイッチギヤ10、30で地絡及び相間短絡が発生し内部アークを生じたかを検知することができる。さらに、検知した結果に基づき電力供給を遮断すると同時に、又は電力供給の遮断に続いて、対応するスイッチギヤ10、30の接地スイッチ3、23を「閉」とすることで内部アークを抑制することができる。
In the second embodiment, as described above, first, in step S202 shown in FIG. 4A, it is determined whether or not there is a decrease in the current value exceeding the threshold value Is1, and then in step S203 shown in FIG. 4B. It was determined whether or not there was a decrease in the current value exceeding the threshold value Is2.
Since this series of determinations is performed in cooperation with the detector 8 of the first switch gear 10 and the detector 28 of the second switch gear 30, the time required for detection becomes longer, but any of the switch gears 10 and 30 It is possible to detect whether a ground fault or a phase-to-phase short circuit has occurred and an internal arc has occurred. Further, the internal arc is suppressed by shutting off the power supply based on the detected result, or by closing the grounding switches 3 and 23 of the corresponding switch gears 10 and 30 at the same time or following the power supply cutoff. Can be done.
 これに対し、図4Aに示したステップS202と図4Bに示したステップS203とは、独立した処理として取り扱うこともできる。
 つまり、図4Aに示したステップS202での判断を省略し、図4BのステップS203の判断のみを行うことでも内部アークの発生を検知することができる。この場合、上述の、ステップS202とステップS203の双方の判断を一連として実施する場合とは異なり、どちらのスイッチギヤ10、30で内部アークが生じているかは判断することができないが、第一と第二のスイッチギヤ10、30のいずれかで内部アークが生じていることは検知することができる。
On the other hand, step S202 shown in FIG. 4A and step S203 shown in FIG. 4B can be treated as independent processes.
That is, the generation of the internal arc can be detected by omitting the determination in step S202 shown in FIG. 4A and performing only the determination in step S203 in FIG. 4B. In this case, unlike the case where both the determinations of steps S202 and S203 are performed as a series, it is not possible to determine which switch gears 10 and 30 generate the internal arc. It can be detected that an internal arc is generated in any of the second switch gears 10 and 30.
 しかし、ステップS202を省略し、ステップS203の判断のみを実施する、この内部アークの検知方法では、第一のスイッチギヤ10と第二のスイッチギヤ30に配置された2つの検出器8、28を協調させる必要はなく、2つの検出器8、28は並列に判断し、接地スイッチ3、23を制御する。そのため、内部アークの発生を高速に検知し、接地スイッチ3、23を短時間で動作させて内部アークを抑制することができる。さらに検出器8、28相互間のデータの送受信が不要となるため省配線化を達成することもできる。 However, in this internal arc detection method in which step S202 is omitted and only the determination in step S203 is performed, the two detectors 8 and 28 arranged in the first switch gear 10 and the second switch gear 30 are used. There is no need to coordinate, the two detectors 8 and 28 determine in parallel and control the ground switches 3 and 23. Therefore, the generation of the internal arc can be detected at high speed, and the grounding switches 3 and 23 can be operated in a short time to suppress the internal arc. Further, since it is not necessary to send and receive data between the detectors 8 and 28, wiring saving can be achieved.
 なお、図4BのステップS203はIu2-Im-ΣId2>Ith2と示したが、これはIu2は第二スイッチギヤの上位から下位に流れる電流を正、Imは第二スイッチギヤから第一スイッチギヤに流れる電流を正、Id2は第二スイッチギヤの上位から下位に流れる電流を正、とした極性で処理する場合である。
 一方、Iu2は第二スイッチギヤの上位から下位に流れる電流を正、Imは第二スイッチギヤから第一スイッチギヤに流れる電流を負、Id2は第二スイッチギヤの上位から下位に流れる電流を負、となるよう極性を変更すると、ステップS203はIu2+Im+ΣId2とすることもできる。すなわち、センサの極性を変更することで、加算のみで同じ処理を行う事ができ、アナログ回路で実施した場合、回路構成を簡素化することができる。
 また、センサの極性を事前に設定しておけばよいので、第一、第二スイッチギヤでも同じ処理で判定することが可能である。
In step S203 of FIG. 4B, Iu2-Im-ΣId2> Is2 was shown. This means that Iu2 positively transfers the current flowing from the upper side to the lower side of the second switch gear, and Im changes from the second switch gear to the first switch gear. In this case, the flowing current is positive, and Id2 is the positive current flowing from the upper side to the lower side of the second switch gear.
On the other hand, Iu2 is positive for the current flowing from the upper side to the lower side of the second switch gear, Im is negative for the current flowing from the second switch gear to the first switch gear, and Id2 is negative for the current flowing from the upper side to the lower side of the second switch gear. If the polarity is changed so that, step S203 can be set to Iu2 + Im + ΣId2. That is, by changing the polarity of the sensor, the same processing can be performed only by addition, and when implemented in an analog circuit, the circuit configuration can be simplified.
Further, since the polarity of the sensor may be set in advance, the first and second switch gears can be judged by the same process.
 本願の実施の形態1及び2において、電流センサでのデータ収集及び入力タイミング、接地スイッチの動作信号等、各種データ処理等の演算を行う検出器8、28を構成するハードウェア51の一例を図5に示す。ここではデジタル処理を用いる例を示すが、アナログ回路によっても本願を実施することができる。
 図に示すように、検出器8、28を構成するハードウェア51は、プロセッサ52と記憶装置53から構成される。記憶装置は図示していないが、ランダムアクセスメモリ等の揮発性記憶装置と、フラッシュメモリ等の不揮発性の補助記憶装置とを具備する。また、フラッシュメモリの代わりにハードディスクの補助記憶装置を具備してもよい。プロセッサ52は、記憶装置53から入力されたプログラムを実行する。この場合、補助記憶装置から揮発性記憶装置を介してプロセッサ52にプログラムが入力される。また、プロセッサ52は、演算結果等のデータを記憶装置53の揮発性記憶装置に出力してもよいし、揮発性記憶装置を介して補助記憶装置にデータを保存してもよい。
In the first and second embodiments of the present application, an example of hardware 51 constituting detectors 8 and 28 that perform calculations such as data collection and input timing by a current sensor, operation signals of a ground switch, and various other data processing is shown. Shown in 5. Although an example of using digital processing is shown here, the present application can also be implemented by an analog circuit.
As shown in the figure, the hardware 51 constituting the detectors 8 and 28 includes a processor 52 and a storage device 53. Although the storage device is not shown, it includes a volatile storage device such as a random access memory and a non-volatile auxiliary storage device such as a flash memory. Further, an auxiliary storage device of a hard disk may be provided instead of the flash memory. The processor 52 executes the program input from the storage device 53. In this case, a program is input from the auxiliary storage device to the processor 52 via the volatile storage device. Further, the processor 52 may output data such as a calculation result to the volatile storage device of the storage device 53, or may store the data in the auxiliary storage device via the volatile storage device.
 また、本願の実施の形態1及び2において、図2に示したステップS101とステップS102、図4Aに示したステップS201とステップS202、及び図4Bに示したステップS201とステップS203は、それぞれ順序を入れ替えて実施しても同様の結果を得ることができる。 Further, in the first and second embodiments of the present application, steps S101 and S102 shown in FIG. 2, steps S201 and S202 shown in FIG. 4A, and steps S201 and S203 shown in FIG. 4B are in the same order, respectively. Similar results can be obtained even if they are replaced and carried out.
 本願は、様々な例示的な実施の形態及び実施例が記載されているが、1つ又は複数の実施の形態に記載された様々な特徴、態様、及び機能は特定の実施の形態の適用に限られるのではなく、単独で、又は様々な組み合わせで実施の形態に適用可能である。
 従って、例示されていない無数の変形例が、本願明細書に開示される技術の範囲内において想定される。例えば、少なくとも1つの構成要素を変形する場合、追加する場合又は省略する場合、さらには、少なくとも1つの構成要素を抽出し、他の実施の形態の構成要素と組み合わせる場合が含まれるものとする。
Although various exemplary embodiments and examples have been described in the present application, the various features, embodiments, and functions described in one or more embodiments may be applied to the application of a particular embodiment. It is not limited, but can be applied to embodiments alone or in various combinations.
Therefore, innumerable variations not illustrated are envisioned within the scope of the techniques disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.
1,21 受電盤、2,22 受電側遮断器、3,23 接地スイッチ、4,24 受電側電流センサ、5,25 フィーダ側遮断器、6,26 フィーダ側電流センサ、7,27 負荷、8,28 検出器、9a,9b,9c,29a,29b,29c フィーダ盤、10,30 スイッチギヤ、14,34 受電回路、15,35 負荷回路、41 接続用遮断器、42 接続用電流センサ、43 接続回路、50 接続部、51 ハードウェア、52 プロセッサ、53 記憶装置、60 スイッチギヤ群。 1,21 Power receiving board, 2,22 Power receiving side circuit breaker, 3,23 Ground switch, 4,24 Power receiving side current sensor, 5,25 Feeder side circuit breaker, 6,26 Feeder side current sensor, 7,27 Load, 8 , 28 Detector, 9a, 9b, 9c, 29a, 29b, 29c Feeder board, 10,30 Switch gear, 14,34 Power receiving circuit, 15,35 Load circuit, 41 Circuit breaker for connection, 42 Current sensor for connection, 43 Connection circuit, 50 connection part, 51 hardware, 52 processor, 53 storage device, 60 switch gear group.

Claims (20)

  1.  受電側遮断器及び受電側電流センサ及び接地スイッチからなる受電回路を有し、外部から電力供給を受ける受電盤と、
     フィーダ側遮断器及びフィーダ側電流センサからなり負荷を接続する負荷回路を有し、前記受電盤から電力供給を受けるフィーダ盤と、を備え、
     前記受電側電流センサの電流値から、前記フィーダ側電流センサの電流値を減じた差異を検出した場合に、内部アークの発生と判断する検出器を備えたことを特徴とするスイッチギヤ。
    A power receiving circuit that has a power receiving circuit consisting of a power receiving side circuit breaker, a power receiving side current sensor, and a ground switch, and a power receiving board that receives power supply from the outside.
    It is composed of a feeder side circuit breaker and a feeder side current sensor, has a load circuit for connecting a load, and is provided with a feeder board that receives power supply from the power receiving board.
    A switch gear comprising a detector that determines that an internal arc is generated when a difference obtained by subtracting the current value of the feeder side current sensor from the current value of the power receiving side current sensor is detected.
  2.  前記検出器は、前記受電側電流センサの電流値から、複数の前記フィーダ側電流センサの電流値の和を減じた差異を検出した場合に、内部アークの発生と判断することを特徴とする請求項1に記載のスイッチギヤ。 A claim characterized in that the detector determines that an internal arc is generated when it detects a difference obtained by subtracting the sum of the current values of a plurality of feeder-side current sensors from the current value of the power-receiving side current sensor. Item 1. The switch gear according to item 1.
  3.  前記検出器が、内部アークの発生と判断した場合に、前記受電回路の接地スイッチを導通状態とすることを特徴とする請求項1又は請求項2に記載のスイッチギヤ。 The switch gear according to claim 1 or 2, wherein the ground switch of the power receiving circuit is brought into a conductive state when the detector determines that an internal arc is generated.
  4.  前記受電回路の接地スイッチは、前記受電側遮断器の前記フィーダ盤の側に配置されていることを特徴とする請求項3に記載のスイッチギヤ。 The switch gear according to claim 3, wherein the ground switch of the power receiving circuit is arranged on the side of the feeder board of the power receiving side circuit breaker.
  5.  前記受電回路の接地スイッチは、前記受電側電流センサの前記フィーダ盤の側に配置されていることを特徴とする請求項3に記載のスイッチギヤ。 The switch gear according to claim 3, wherein the grounding switch of the power receiving circuit is arranged on the side of the feeder board of the power receiving side current sensor.
  6.  前記検出器が、内部アークの発生と判断した場合、前記受電側遮断器を遮断状態とすることを特徴とする請求項2に記載のスイッチギヤ。 The switch gear according to claim 2, wherein when the detector determines that an internal arc is generated, the power receiving side circuit breaker is cut off.
  7.  前記フィーダ側電流センサの電流値が、事前に定めた最大電流値を超えている場合、異常と判断する請求項1に記載のスイッチギヤ。 The switch gear according to claim 1, wherein when the current value of the feeder side current sensor exceeds the predetermined maximum current value, it is determined to be abnormal.
  8.  受電側遮断器及び受電側電流センサ及び接地スイッチからなる受電回路を有し、外部から電力供給を受ける受電盤と、
     フィーダ側遮断器及びフィーダ側電流センサからなり負荷を接続する負荷回路を有し、前記受電盤から電力供給を受けるフィーダ盤と、を各々備えた第一のスイッチギヤと第二のスイッチギヤを備え、
     各々のフィーダ盤の間を、接続用遮断器と接続用電流センサとを有する接続部により相互に接続するスイッチギヤ群であって、
     前記第一のスイッチギヤの受電側遮断器が不通状態であり、前記接続部を通じて前記第二のスイッチギヤから、前記第一のスイッチギヤのフィーダ盤に電力を供給し、
     前記接続部の接続用電流センサの電流値から、前記第一のスイッチギヤのフィーダ側電流センサの電流値を減じた差異を検出した場合に、内部アークの発生と判断する検出器を備えたことを特徴とするスイッチギヤ群。
    A power receiving circuit that has a power receiving circuit consisting of a power receiving side circuit breaker, a power receiving side current sensor, and a ground switch, and a power receiving board that receives power supply from the outside.
    It has a load circuit consisting of a feeder-side circuit breaker and a feeder-side current sensor to connect the load, and has a first switch gear and a second switch gear, each of which includes a feeder board that receives power from the power receiving board. ,
    A group of switch gears that connect each feeder panel to each other by a connection portion having a connection breaker and a connection current sensor.
    The power receiving side circuit breaker of the first switch gear is in a non-communication state, and power is supplied from the second switch gear to the feeder panel of the first switch gear through the connection portion.
    It is equipped with a detector that determines that an internal arc is generated when a difference obtained by subtracting the current value of the feeder side current sensor of the first switch gear from the current value of the connection current sensor of the connection portion is detected. A group of switch gears characterized by.
  9.  前記検出器は、前記接続用電流センサの電流値から、前記第一のスイッチギヤの複数のフィーダ側電流センサの電流値の和を減じた差異を検出した場合に、内部アークの発生と判断することを特徴とする請求項8に記載のスイッチギヤ群。 When the detector detects a difference obtained by subtracting the sum of the current values of the plurality of feeder side current sensors of the first switch gear from the current value of the connection current sensor, it determines that an internal arc is generated. The switch gear group according to claim 8, wherein the switch gear group is characterized in that.
  10.  前記検出器が、内部アークの発生と判断した場合に、前記第一のスイッチギヤの受電回路の接地スイッチを導通状態とすることを特徴とする請求項8又は請求項9に記載のスイッチギヤ群。 The switch gear group according to claim 8 or 9, wherein the ground switch of the power receiving circuit of the first switch gear is brought into a conductive state when the detector determines that an internal arc is generated. ..
  11.  前記第一のスイッチギヤの受電回路の接地スイッチは、前記受電側遮断器の前記フィーダ盤の側に配置されていることを特徴とする請求項10に記載のスイッチギヤ群。 The switch gear group according to claim 10, wherein the ground switch of the power receiving circuit of the first switch gear is arranged on the side of the feeder board of the power receiving side circuit breaker.
  12.  前記第一のスイッチギヤの前記フィーダ側電流センサの電流値が、事前に定めた最大電流値を超えている場合、異常と判断する請求項8に記載のスイッチギヤ群。 The switch gear group according to claim 8, wherein when the current value of the feeder side current sensor of the first switch gear exceeds a predetermined maximum current value, it is determined to be abnormal.
  13.  受電側遮断器及び受電側電流センサ及び接地スイッチからなる受電回路を有し、外部から電力供給を受ける受電盤と、
     フィーダ側遮断器及びフィーダ側電流センサからなり負荷を接続する負荷回路を有し、前記受電盤から電力供給を受けるフィーダ盤と、を各々備えた第一のスイッチギヤと第二のスイッチギヤを備え、
     各々のフィーダ盤の間を、接続用遮断器と接続用電流センサとを有する接続部により相互に接続するスイッチギヤ群であって、
     前記第一のスイッチギヤの受電側遮断器が不通状態であり、前記接続部を通じて前記第二のスイッチギヤから、前記第一のスイッチギヤのフィーダ盤に電力を供給し、
     前記第二のスイッチギヤの電源側電流センサの電流値から、前記第二のスイッチギヤのフィーダ側電流センサの電流値と前記接続用電流センサの電流値とを減じた差異を検出した場合に、内部アークの発生と判断する検出器を備えたことを特徴とするスイッチギヤ群。
    A power receiving circuit that has a power receiving circuit consisting of a power receiving side circuit breaker, a power receiving side current sensor, and a ground switch, and a power receiving board that receives power supply from the outside.
    It has a load circuit consisting of a feeder-side circuit breaker and a feeder-side current sensor to connect the load, and has a first switch gear and a second switch gear, each of which includes a feeder board that receives power from the power receiving board. ,
    A group of switch gears that connect each feeder panel to each other by a connection portion having a connection breaker and a connection current sensor.
    The power receiving side circuit breaker of the first switch gear is in a non-communication state, and power is supplied from the second switch gear to the feeder panel of the first switch gear through the connection portion.
    When the difference obtained by subtracting the current value of the feeder side current sensor of the second switch gear and the current value of the connection current sensor from the current value of the power supply side current sensor of the second switch gear is detected, A group of switch gears equipped with a detector that determines the generation of an internal arc.
  14.  受電側遮断器及び受電側電流センサ及び接地スイッチからなる受電回路を有し、外部から電力供給を受ける受電盤と、
     フィーダ側遮断器及びフィーダ側電流センサからなり負荷を接続する負荷回路を有し、前記受電盤から電力供給を受けるフィーダ盤と、を各々備えた第一のスイッチギヤと第二のスイッチギヤを備え、
     各々のフィーダ盤の間を、接続用遮断器と接続用電流センサとを有する接続部により相互に接続するスイッチギヤ群であって、
     前記第一のスイッチギヤの受電側遮断器が不通状態であり、前記接続部を通じて前記第二のスイッチギヤから、前記第一のスイッチギヤのフィーダ盤に電力を供給し、
     前記接続部の接続用電流センサの電流値から、前記第一のスイッチギヤのフィーダ側電流センサの電流値を減じた差異を検出できず、
     前記第二のスイッチギヤの受電側電流センサの電流値から、前記第二のスイッチギヤのフィーダ側電流センサの電流値と前記接続用電流センサの電流値とを減じた差異を検出した場合に、内部アークの発生と判断する検出器を備えたことを特徴とするスイッチギヤ群。
    A power receiving circuit that has a power receiving circuit consisting of a power receiving side circuit breaker, a power receiving side current sensor, and a ground switch, and a power receiving board that receives power supply from the outside.
    It has a load circuit consisting of a feeder-side circuit breaker and a feeder-side current sensor to connect the load, and has a first switch gear and a second switch gear, each of which includes a feeder board that receives power from the power receiving board. ,
    A group of switch gears that connect each feeder panel to each other by a connection portion having a connection breaker and a connection current sensor.
    The power receiving side circuit breaker of the first switch gear is in a non-communication state, and power is supplied from the second switch gear to the feeder panel of the first switch gear through the connection portion.
    The difference obtained by subtracting the current value of the feeder side current sensor of the first switch gear from the current value of the connection current sensor of the connection portion could not be detected.
    When the difference obtained by subtracting the current value of the feeder side current sensor of the second switch gear and the current value of the connection current sensor from the current value of the power receiving side current sensor of the second switch gear is detected, A group of switch gears equipped with a detector that determines the generation of an internal arc.
  15.  前記検出器は、前記受電側電流センサの電流値から、前記第一のスイッチギヤの複数のフィーダ側電流センサの電流値の和を減じた差異を検出できず、
     前記第二のスイッチギヤの受電側電流センサの電流値から、前記第二のスイッチギヤのフィーダ側電流センサの電流値と前記接続用電流センサの電流値とを減じた差異を検出した場合に、内部アークの発生と判断することを特徴とする請求項14に記載のスイッチギヤ群。
    The detector cannot detect the difference obtained by subtracting the sum of the current values of the plurality of feeder side current sensors of the first switch gear from the current value of the power receiving side current sensor.
    When the difference obtained by subtracting the current value of the feeder side current sensor of the second switch gear and the current value of the connection current sensor from the current value of the power receiving side current sensor of the second switch gear is detected, The switch gear group according to claim 14, wherein it is determined that an internal arc is generated.
  16.  前記検出器は、前記第二のスイッチギヤの受電側電流センサの電流値から、前記第二のスイッチギヤの複数のフィーダ側電流センサの電流値の和と前記接続用電流センサの電流値とを減じた差異を検出した場合に、内部アークの発生と判断することを特徴とする請求項13から請求項15のいずれか1項に記載のスイッチギヤ群。 The detector calculates the sum of the current values of the plurality of feeder-side current sensors of the second switch gear and the current value of the connection current sensor from the current value of the current sensor on the power receiving side of the second switch gear. The switch gear group according to any one of claims 13 to 15, wherein when the reduced difference is detected, it is determined that an internal arc is generated.
  17.  前記検出器が、内部アークの発生と判断した場合に、前記第二のスイッチギヤの受電回路の接地スイッチを導通状態とすることを特徴とする請求項13から請求項16のいずれか1項に記載のスイッチギヤ群。 The present invention according to any one of claims 13 to 16, wherein the ground switch of the power receiving circuit of the second switch gear is brought into a conductive state when the detector determines that an internal arc is generated. The described switch gear group.
  18.  前記第二のスイッチギヤの受電回路の接地スイッチは、前記第二のスイッチギヤの受電側遮断器の前記フィーダ盤の側に配置されていることを特徴とする請求項17に記載のスイッチギヤ群。 The switch gear group according to claim 17, wherein the ground switch of the power receiving circuit of the second switch gear is arranged on the side of the feeder board of the power receiving side circuit breaker of the second switch gear. ..
  19.  前記検出器が、内部アークの発生と判断した場合、前記第二のスイッチギヤの前記受電側遮断器と前記接続部の前記接続用遮断器の両方又はいずれか一方を遮断状態とすることを特徴とする請求項9又は請求項16に記載のスイッチギヤ。 When the detector determines that an internal arc is generated, it is characterized in that both or one of the power receiving side circuit breaker of the second switch gear and the connection circuit breaker of the connection portion is cut off. The switch gear according to claim 9 or 16.
  20.  前記第一のスイッチギヤの前記フィーダ側電流センサの電流値、及び前記第二のスイッチギヤの前記フィーダ側電流センサの電流値が、事前に定めた最大電流値を超えている場合、異常と判断する請求項13又は請求項14に記載のスイッチギヤ群。 If the current value of the feeder-side current sensor of the first switch gear and the current value of the feeder-side current sensor of the second switch gear exceed a predetermined maximum current value, it is determined to be abnormal. The switch gear group according to claim 13 or 14.
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