JP2008043181A - Opening/closing device for power distribution - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an opening/closing device for power distribution, capable of improving reliability by preventing ground fault on the whole load side including a breaker and extending a protection range, and attaining labor saving for maintenance and longer service life. <P>SOLUTION: A machine chamber 4 is formed on the front side and a main busbar room 5 is formed on the back surface side in a case body 1, in a power distribution board by partitioning each thereof. A vacuum breaker 10 and an apparatus unit 14, including a current transformer 11 provided on the load side of the vacuum breaker 10 and a zero-phase current transformer 12 provided on the power supply side of the vacuum breaker 10 are disposed in the machine chamber 4 in the vertical direction. A solid-insulated busbar 20 which is disposed in the width direction of the case body 1, solid-insulated communication busbars 21 connected to the main busbar 20 and connected to one side of the apparatus unit 14, respectively, and solid-insulated leading-out bus bars 29, 30 which are connected to the other side of the apparatus unit 14 are respectively disposed in the busbar chamber 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a distribution switchgear, and more particularly to a distribution switchgear configured by arranging a circuit breaker, a current transformer, a zero-phase current transformer, and the like in series.

  As switchgear for power distribution, circuit breakers, current transformers (instrument current transformers) and zero-phase current transformers are connected in series to form a unit, and this unit is moved on the rail, or the unit is a carriage There is one installed on the distribution board so that it can be pulled out from the distribution board. (For example, see Patent Documents 1 and 2.)

Japanese Utility Model Publication No.7-11813 JP 2003-189422 A

  Conventional switchgears for power distribution are compact and have features such as good maintenance and inspection of the units constituting the switchgear for power distribution, and thus have been introduced into various systems. With the introduction of these various systems, points to be improved with respect to the switchgear for power distribution have been scattered.

  First, as a point to be improved, the conventional switchgear for distribution has a zero-phase current transformer arranged on the load side of the circuit breaker so that it can detect the ground fault on the load side of the circuit breaker. No consideration is given to protecting the ground fault on the entire load side, including the circuit breaker on the power supply side of the phase current transformer.

  In addition, there is room for improvement in terms of maintainability of busbars connected to distribution switchgears and longer life of distribution switchgears, and the configuration is still not ideal for users of distribution switchgears. is the current situation.

  The present invention has been made based on the above-mentioned matters, and the purpose of the present invention is to improve the reliability by performing the ground fault protection on the entire load side including the circuit breaker by expanding the protection range. Of course, an object of the present invention is to provide a switchgear for power distribution that can achieve maintenance labor saving and longer life.

  In order to achieve the above object, the switchgear for power distribution according to the present invention has a device room on the front side and a main bus room on the rear side in the casing of the switchboard, and a circuit breaker, A device unit consisting of a current transformer provided on the load side of the circuit breaker and a zero-phase current transformer provided on the power supply side of the circuit breaker is arranged in the vertical direction, and in the width direction of the housing in the main bus room. A main bus that is arranged and solid-insulated, a connecting bus that is connected to the main bus and connected to one side of the device unit and is solid-insulated, and a drawer bus that is connected to the other side of the device unit and is solid-insulated Or two device units consisting of a circuit breaker in the casing, a current transformer provided on the load side of the circuit breaker, and a zero-phase current transformer provided on the power supply side of the circuit breaker In the housing and the first board placed in An instrument transformer unit having a circuit breaker, a current transformer provided on the load side of the circuit breaker, and a zero-phase current transformer provided on the power supply side of the circuit breaker, and an instrument transformer unit arranged in the vertical direction The second panel, the instrument transformer unit having the instrument transformer and the lightning arrester, and the third panel in which the disconnector unit having the disconnector is arranged in the vertical direction are arranged side by side. Between the panels, a main bus bar arranged in the width direction of the housing and solid-insulated, a connecting bus bar connected to the main bus bar and connected to one side of the devices of each unit and solid-insulated, It is connected to the other side of each unit by a drawer bus which is solid-insulated.

  According to the switchgear for power distribution of the present invention, since the zero-phase current transformer is arranged on the power supply side of the circuit breaker constituting the equipment unit, the ground fault protection of the entire load side including the circuit breaker expands the protection range. As well as being able to improve reliability, the main bus bar, which is solidly insulated, is housed in a main bus room that is separate from the equipment room that houses the equipment unit, saving labor and extending the service life. Can be achieved.

  Hereinafter, embodiments of a power distribution switchgear according to the present invention will be described with reference to the drawings.

  1 to 5 show a first embodiment of a distribution switchgear according to the present invention. FIG. 1 is a longitudinal side view of an embodiment of a distribution switchgear according to the present invention. FIG. FIG. 3 is a perspective view showing a partial cross-sectional view of an embodiment of the distribution switchgear according to the present invention shown in FIG. 1, and FIG. 4 is an embodiment of the switchgear for distribution according to the present invention shown in FIG. The perspective view which expands and shows the main bus-line part which comprises a form, FIG. 5: is a schematic connection figure of one Embodiment of the switchgear for power distribution of this invention.

  1 to 3, the casing 1 of the switchgear for power distribution is internally partitioned by the partition plates 2 and 3, and the equipment room 4, the main bus room 5 and the cable room 6 are formed from the front side (right side in FIG. 1). Has been. As shown in FIGS. 1 and 2, a front door 7 is provided on the front side of the housing 1 so as to be openable and closable. A digital protection control unit 8 is mounted on the door 7. Further, as shown in FIG. 1, a back door 9 is provided on the back side of the housing 1 so as to be openable and closable.

In the equipment chamber 4, a vacuum circuit breaker (VCB) 10 provided in parallel in the width direction of the casing 1 (direction orthogonal to the paper surface of FIG. 1), and current transformers provided on the load side of these vacuum circuit breakers 10, respectively. (CT) 11, zero-phase current transformer (ZCT) 12 provided on the power supply side of each vacuum circuit breaker 10, and surge absorber (SA) 13 (see FIG. 5) for protecting against external lightning surge The device units 14 are arranged in the vertical direction.

  These device units 14 can be pulled out to the front side in the housing 1 (right direction in FIG. 1) by means of a carriage 15 provided in the lower part and a guide 16 for guiding the carriage 15. These device units 14 are usually fixed by a lock device (not shown), and when pulling forward, the lock device (not shown) is released and a handle provided on the front surface of the device unit 14 is provided. By pulling 17, it can be pulled forward. As a result, in the event of an emergency, the device can be easily replaced and the replacement time can be minimized.

  The vacuum circuit breaker 10, the current transformer 11, and the zero-phase current transformer 12 constituting the device unit 14 described above are connected in series as shown in FIG. The zero-phase current transformer 12 is arranged on the power supply side of the vacuum circuit breaker 10, the current transformer 11 is arranged on the load side of the vacuum circuit breaker 10, and a surge absorber 13 for protecting from external lightning surge is provided. The vacuum circuit breaker 10 is connected to the load side. Moreover, the current transformer is a multi-ratio type capable of supporting a plurality of rated currents, and improves the reliability.

  The opening / closing operation mechanism of the vacuum circuit breaker 10 described above is an electromagnetic operation device that combines an electromagnet and a permanent magnet, and a solid insulation bearing is used for the sliding portion of the mechanism, so that maintenance is simplified by eliminating grease. It is illustrated.

  As shown in FIG. 5, a terminal 18 connected to the fixed electrode side of the vacuum circuit breaker 10 and a terminal 19 connected to the movable electrode side of the vacuum circuit breaker 10 are arranged on the back of each device unit 14. Specifically, in the upper and lower device units 14, the terminal 18 is disposed on the upper side and the terminal 19 is disposed on the lower side, respectively. These terminals 18 and 19 are connected to a connecting bus 21 and lead-out buses 29 and 30 connected to a main bus 20 in the main bus chamber 5 described later via an air bushing portion. Reference numeral 23 in FIG. 5 is a cable head, and 24 is a cable.

  Returning to FIG. 1 and FIG. 3, a main bus bar 20 that is solid-insulated along the width direction of the housing 1 is disposed in the main bus chamber 5 at the intermediate portion in the height direction of the housing 1. One end of a solid-insulated connecting bus 21 is connected to the main bus 20. The other end of the connection bus 21 has a bifurcated shape, and the connection terminal 25 on one side thereof is introduced into the equipment chamber 4 so as to be able to contact and separate from the terminal 19 of the upper equipment unit 14 described above, The connection terminal 26 on the other side is introduced into the device room 4 so as to be able to contact and separate from the terminal 18 of the lower device unit 14 described above. These connection terminals 25 and 26 are fixed to the partition plate 2 by air interruption path bushings 27 and 28, respectively.

  On the upper side and the lower side in the main bus room 5, solid-insulated lead buses 29 and 30 are arranged, respectively. The connection terminal 31 on one side of the upper lead-out bus 29 is introduced into the device chamber 4 so as to be able to contact and separate from the terminal 18 of the upper device unit 14 described above, and the partition plate 2 by the air interruption path bushing 32. It is fixed to. The other side of the upper lead bus 29 is connected to a cable head 23 fixed to the partition plate 3.

  The connection terminal 33 on one side of the lower drawer bus 30 is introduced into the equipment room 4 so as to be able to contact and separate from the terminal 19 of the lower equipment unit 14 described above, and is partitioned by the air interruption path bushing 34. It is fixed to the plate 2. The other side of the lower lead bus 30 is connected to a cable head 23 fixed to the partition plate 3. A solid-insulated cable 24 is connected to each cable head 23 in the cable chamber 6.

  The details of the connection configuration of the main bus 20, the communication bus 21, and the lead buses 29 and 30 are shown in FIG. In this figure, the partition plates 2 and 3 are omitted for drawing. In FIG. 4, since the same reference numerals as those in FIG. 1 are the same parts, detailed description is omitted. However, for example, one side of the main bus 20 and the connection bus 21 is connected to the connection bus 21 and the other side is connected. The main bus 20 is connected to the main bus 20 by a connecting bus 35 that is clamped. This takes account of these disassembly and assembly. In addition, the main bus bar 20, the contact bus bar 21, the lead bus bars 29, 30 and the like are provided with a grounding layer so as to be safe against electric shock and the like, and are maintenance-free so that maintenance labor can be saved. It has been. Moreover, as an insulator provided in the main bus bar 20, the communication bus bar 21, the lead bus bars 29, 30 and the like, an epoxy resin, silicon rubber, EP rubber, or the like can be used and formed by injection into a mold.

  Next, the operation in the first embodiment of the power distribution switchgear described above will be described.

  In this embodiment, the current transformer 11 provided on the load side of the vacuum circuit breaker 10 and the zero-phase current transformer 12 provided on the power source side of the vacuum circuit breaker 10 are used to detect abnormalities such as a ground fault occurring in the system. Since the vacuum circuit breaker 10 can be opened by detection, the ground fault protection of the entire load side including the vacuum circuit breaker 10 can be performed, and the protection range can be expanded to improve its reliability.

  In addition, the main bus bar 20, the communication bus bar 21, and the lead bus bars 29 and 30 that are solidly insulated are arranged in the main bus bar room 5 at the back of the equipment room 4 so that the insulation distance between these bus bars is reduced. The space is reduced, and the entire switchgear can be reduced in size.

  Furthermore, since the main bus bar 20, the communication bus bar 21, the lead bus bars 29, 30 and the like are solid-insulated, maintenance such as cleaning for preventing a short circuit accident due to dust adhesion becomes unnecessary, and labor saving of maintenance is achieved. Can be planned.

  Further, since the main bus bar 20, the communication bus bar 21, the lead bus bars 29, 30 and the like are solid-insulated, the air purge for preventing condensation may be performed only in the equipment room 4. For this reason, while being able to miniaturize the air purge equipment which is incidental equipment, the installation cost and its maintenance cost can be reduced.

  As described above, according to one embodiment of the switchgear for power distribution of the present invention, it is possible to protect the ground on the entire load side including the vacuum circuit breaker and to expand the protection range and improve its reliability. In addition, the insulation performance of the bus bar is not easily affected by the atmosphere, environmental conditions, altitude, etc., and there is a risk that the insulation performance will deteriorate due to contamination of the insulation due to dust, salt damage, condensation, etc. There are few, and safety is good. In addition, since the insulation distance between the ground and the phase can be reduced, there are advantages such as easy layout of the busbars and space saving, providing a power distribution switchgear that is close to the ideal type according to customer requirements can do.

  FIG. 6 is a longitudinal sectional side view showing a second embodiment of the power distribution switchgear according to the present invention. In FIG. 6, the same reference numerals as those in FIG. 1 denote the same parts.

  In the present embodiment, the main bus room and the cable room in the first embodiment described above are used as a common room 36, and the common room 36 is formed at the back of the equipment room 4. The main bus 20, the communication bus 21, the lead buses 29 and 30, the cable head 23, and the cable 24 are respectively arranged.

  According to this embodiment, the same effects as those of the first embodiment described above can be obtained, and the maintenance and assembling of busbars and the like are improved by omitting the partition plate 3 shown in FIG. can do.

  FIG. 7 is a longitudinal side view showing a third embodiment of the power distribution switchgear according to the present invention. In this figure, the same reference numerals as those in FIG. 1 denote the same parts.

  In this embodiment, the cable chamber 6 in the first embodiment described above is omitted, and the cable 24 is exposed outside the housing 1. Other configurations are the same as those of the embodiment shown in FIG.

  According to this embodiment, the same effects as those of the above-described embodiment can be obtained, and the installation area can be reduced by omitting the cable chamber 6, which is effective for installation in a narrow place.

  FIG. 8 is a schematic connection diagram showing a fourth embodiment of a power distribution switchgear according to the present invention. In this figure, the same reference numerals as those in FIGS. 1 to 5 denote the same or corresponding parts.

  In this embodiment, a disconnecting portion 80 is provided on the fixed electrode side and the movable electrode side of the vacuum circuit breaker 10. The disconnecting portion 80 is disconnected by an electromagnetic operating device combining an electromagnet and a permanent magnet, similarly to the operation mechanism of the vacuum circuit breaker 10 described above. A solid insulation bearing is used for the sliding portion of this electromagnetic operating device, and the maintenance is simplified by eliminating grease.

  Also in this embodiment, the same effect as that of the above-described embodiment can be obtained.

  9 and 10 show an example in which the embodiment of the power distribution switchgear according to the present invention described above is configured in a row, FIG. 9 is a schematic connection diagram thereof, and FIG. 10 is a perspective view of the back side thereof. It is. In these drawings, the same reference numerals as those in FIGS. 1 to 5 denote the same or corresponding parts.

  In FIG. 9, on the right side of the figure, a vacuum circuit breaker (VCB) 10, a disconnection portion 80 provided on the fixed electrode side and the movable electrode side of the vacuum circuit breaker 10, and a load side of the vacuum circuit breaker 10 are provided. A device unit 14 composed of a current transformer (CT) 11 and a zero-phase current transformer (ZCT) 12 provided on the power supply side of the vacuum circuit breaker 10 is arranged up and down to provide a first panel A1 of the switchgear for power distribution. And another first board A2 having the same configuration as above is juxtaposed on the left side of the first board A1, and the second board B is placed on the left side of the other first board A2. A third board C is juxtaposed on the left side of the board B to constitute a row board.

  The second panel B includes a vacuum circuit breaker (VCB) 10, a disconnection portion 80 provided on the fixed electrode side and the movable electrode side of the vacuum circuit breaker 10, and a current transformation provided on the power supply side of the vacuum circuit breaker 10. A device unit 14 composed of a transformer (CT) 11 and a zero-phase current transformer (ZCT) 12 provided on the load side of the vacuum circuit breaker 10 is disposed on the lower side, and an instrument transformer is disposed on the upper side of the device unit 14. An instrument transformer unit including (VT) 81 and a disconnecting section 80 is arranged. The third panel C has an instrument transformer unit composed of an instrument transformer (VT) 81, a disconnecting portion 80 and a lightning arrester 82 arranged on the lower side, and an upper side of the instrument transformer unit is disconnected. The disconnecting unit composed of the portion 80 is arranged.

  As shown in FIG. 10, these first to third panels A1 to C are arranged on the back side of the casing 1 through a main bus 20 and a main bus arranged through an opening 83 provided on the side of the casing 1. The row boards are connected to each other by a communication bus 21 connected to 20, drawer buses 29 and 30 connected to each device, and an auxiliary communication bus 84.

  According to this embodiment, the construction period of the power receiving / transforming equipment can be shortened, and the number of local man-hours at the time of new installation and expansion can be greatly reduced.

  FIG. 11 is a schematic connection diagram showing a sixth embodiment of a power distribution switchgear according to the present invention, in which the same reference numerals as those in FIGS. 1 to 5 denote the same or corresponding parts.

  In this embodiment, a current transformer (CT) 11 and a zero-phase current transformer (ZCT) 12 are provided between the fixed electrode side and the movable electrode side of the vacuum circuit breaker 10 and the disconnecting portion 80. Similarly to the operation mechanism of the vacuum circuit breaker 10 described above, the disconnecting portion 80 is also disconnected by an electromagnetic operating device that combines an electromagnet and a permanent magnet. A solid insulation bearing is also used for the sliding portion of the electromagnetic operating device, thereby simplifying maintenance by eliminating grease.

  Also in this embodiment, the same effect as that of the above-described embodiment can be obtained.

  FIG. 12 shows an example in which the above-described embodiment of the power distribution switchgear according to the present invention is arranged in a row, and is a modification of FIG. In this figure, the same reference numerals as those in FIGS. 1 to 5 denote the same or corresponding parts.

  In FIG. 12, on the right side of the figure, a vacuum circuit breaker (VCB) 10, a disconnection part 80 provided on the fixed electrode side and the movable electrode side of the vacuum circuit breaker 10, a vacuum circuit breaker 10 and each disconnection part 80 are shown. A device unit 14 comprising a current transformer (CT) 11 provided on the load side of the vacuum circuit breaker 10 and a zero-phase current transformer (ZCT) 12 provided on the power supply side of the vacuum circuit breaker 10 is arranged vertically. Thus, the first panel A1 of the switchgear for power distribution is configured, and another first panel A2 having the same configuration as described above is juxtaposed on the left side of the first panel A1, and this other first panel A2 is arranged. A second board B is arranged on the left side of the second board, and a third board C is arranged on the left side of the second board B to form a row board.

  The second board B includes a vacuum circuit breaker (VCB) 10, a disconnection part 80 provided on the fixed electrode side and the movable electrode side of the vacuum circuit breaker 10, and between the vacuum circuit breaker 10 and each disconnection part 80. A device unit 14 comprising a current transformer (CT) 11 provided on the power supply side of the vacuum circuit breaker 10 and a zero-phase current transformer (ZCT) 12 provided on the load side of the vacuum circuit breaker 10 is arranged on the lower side. An instrument transformer unit including an instrument transformer (VT) 81 and a disconnecting portion 80 is arranged on the upper side of the device unit 14. In the third panel C, an instrument transformer unit including an instrument transformer (VT) 81, a disconnecting portion 80, and a lightning arrester 82 is disposed on the lower side, and a vacuum is formed on the upper side of the instrument transformer unit. The disconnector 90 is configured by disposing a disconnector unit including a disconnector 80a provided on the fixed electrode side and the movable electrode side of the vacuum disconnector 90.

  These first to third boards A1 to C are similar to FIG. 10 described above, on the back side of the housing 1, on the main bus 20 disposed through the opening 83 provided on the side of the housing 1, the main The rows of boards are connected by a communication bus 21 connected to the bus 20, drawer buses 29 and 30 connected to each device, and an auxiliary communication bus 84.

  According to this embodiment, the construction period of the power receiving / transforming equipment can be shortened, and the number of local man-hours at the time of new installation and expansion can be greatly reduced.

It is a vertical side view of 1st Embodiment of the switchgear for power distribution of this invention. It is a front view of the switchgear for power distribution of this invention shown in FIG. It is a perspective view which shows the switchgear for power distribution of this invention shown in FIG. 1 in a partial cross section. It is a perspective view which expands and shows the main bus-line part which comprises the switchgear for power distribution of this invention shown in FIG. It is a schematic connection diagram of the first embodiment of the switchgear for power distribution according to the present invention shown in FIG. It is a vertical side view of 2nd Embodiment of the switchgear for power distribution of this invention. It is a vertical side view of 3rd Embodiment of the switchgear for power distribution of this invention. It is a schematic connection figure of 4th Embodiment of the switchgear for power distribution of this invention. It is a general | schematic connection diagram of the example which comprised 5th Embodiment of the switchgear for power distribution of this invention to the row | line | column. It is the perspective view which looked at the back part side of the example which comprised one Embodiment of the switchgear for power distribution of this invention shown in FIG. It is a schematic connection figure of 6th Embodiment of the switchgear for power distribution of this invention. It is a general | schematic connection diagram of the example which comprised 7th Embodiment of the switchgear for power distribution of this invention to the row | line | column.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 2, 3 Partition plate 4 Equipment room 5 Main bus room 6 Cable room 8 Protection control unit 10 Vacuum circuit breaker 11 Current transformer 12 Zero phase current transformer 13 Surge absorber 14 Equipment unit 20 Main bus 21 Connection bus line 22, 29, 30 Drawer bus 23 Cable head 24 Cables 25, 26, 31, 33 Connection terminals 27, 28, 32, 34 Air-interrupting path bushing 35 Connection bus 36 Common chamber 80, 81a Disconnector 81 Instrument transformer 82 Lightning arrester 84 Auxiliary communication bus 90 Vacuum disconnector

Claims (13)

  A device room is formed on the front side in the casing of the switchboard, and a main bus room is formed on the back side. A circuit breaker is provided in the device room, a current transformer provided on the load side of the circuit breaker, and a power source for the circuit breaker. A device unit consisting of a zero-phase current transformer provided on the side is arranged in the vertical direction, and in the main bus chamber, a main bus bar arranged in the width direction of the housing and solid-insulated, and connected to the main bus bar, A distribution switchgear comprising a connecting bus bar connected to one side of the device unit and solid-insulated, and a drawer bus bar connected to the other side of the device unit and solid-insulated.   A device room is formed on the front side in the casing of the switchboard, a main bus room is formed on the back side of the device room, and a cable room is further formed on the back side of the main bus quality, and a circuit breaker, A device unit consisting of a current transformer provided on the load side of the circuit breaker and a zero-phase current transformer provided on the power supply side of the circuit breaker is arranged in the vertical direction, and arranged in the width direction of the housing in the main bus room. A solid-insulated main bus, a connected bus connected to the main bus and connected to one side of the device unit, and one end connected to the other side of the device unit. A lead-out bus that is led out to the cable chamber and is solid-insulated is disposed, and a solid-insulated cable that is connected to the other end of the lead-out bus via a cable head is disposed in the cable chamber. Switchgear for power distribution The switchgear for power distribution according to claim 1 or 2,
The switchgear for power distribution, wherein the device unit further includes a disconnecting portion on the power source side of the circuit breaker.   A device room is formed on the front side in the casing of the switchboard, and a main bus room is formed on the back side. A circuit breaker is provided in the device room, a current transformer provided on the load side of the circuit breaker, and a power source for the circuit breaker. A device unit composed of a zero-phase current transformer and a disconnection section provided on the side, an instrument transformer and an instrument transformer unit having a disconnection section are arranged in the vertical direction, and in the main bus room, A main bus bar arranged in the width direction and solid-insulated, a connecting bus bar connected to the main bus bar and connected to one side of the device unit and the transformer unit for instrumentation and solid-insulated, and the other side of the device unit A switchgear for power distribution, characterized in that a drawer bus connected to and solidly insulated is arranged. In the distribution switchgear according to any one of claims 1, 2, or 4,
A power distribution switchgear characterized in that a ground layer is coated on the surfaces of the main bus bar, the communication bus bar, and the lead-out bus bar. The switchgear for power distribution according to claim 2,
A distribution switchgear characterized in that a grounding layer is coated on the surface of the cable. In the distribution switchgear according to any one of claims 1 to 4,
The power distribution switchgear is characterized in that the device unit is housed in the housing so that it can be brought into and out of contact with the main bus bar by an air bushing and can be pulled out to the front side of the housing. In the distribution switchgear according to any one of claims 1, 2, or 4,
A switchgear for power distribution, wherein a protection control unit is mounted on a door on the front side of the housing. In the distribution switchgear according to any one of claims 1, 2, or 4,
The current transformer is a multi-ratio type capable of supporting a plurality of rated currents. In the distribution switchgear according to any one of claims 1, 2, or 4,
The opening / closing operation mechanism in the device unit or the instrument transformer unit is an electromagnetic operating device composed of an electromagnet and a permanent magnet, and a solid insulation bearing is used for the sliding portion of the electromagnetic operating device. Switchgear.   A first panel in which two equipment units are arranged in the vertical direction, comprising a circuit breaker, a current transformer provided on the load side of the circuit breaker, and a zero-phase current transformer provided on the power supply side of the circuit breaker in the housing And an instrument transformer unit having a circuit breaker in the housing, a current transformer provided on the load side of the circuit breaker, and a zero-phase current transformer provided on the power source side of the circuit breaker, and an instrument transformer. Are arranged in parallel with the second panel, the instrument transformer unit having the instrument transformer and the lightning arrester, and the third panel having the disconnector unit having the disconnector arranged vertically. The main busbars are arranged in a row, and the space between the boards is arranged in the width direction of the casing and is solid-insulated, and one side of each unit device connected to the main busbar is connected and solid-insulated. Solid bus is connected to the other side of each unit Power distribution switchgear, characterized in that it is connected by a lead out bus. The switchgear for power distribution according to claim 11,
The switchgear for power distribution, wherein the disconnector of the third panel is a vacuum disconnector. The switchgear for power distribution according to claim 1, 2, 4, or 11,
The power distribution switchgear, wherein the circuit breaker is a vacuum circuit breaker.

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