JP2013183526A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-insulated switchgear which eliminates the need for stop processing of an adjacent line in the recovery work of a trouble line.SOLUTION: The gas-insulated switchgear includes first through third bus side disconnector grounding switches 3a-3c provided on the double bus side and housing a plurality of lines connected with a double bus including a main bus and an adjacent bus, first through third line side disconnector grounding switches 2a-2c provided on the plurality of line side, first through third gas circuit breakers 1a-1c provided between the first through third bus side disconnector grounding switches 3a-3c and the first through third line side disconnector grounding switches 2a-2c, first and second detachment devices 4a, 4b provided between the lines in the double bus and connect or disconnect the main bus and an adjacent bus detachably, and first through eighth insulation spacers 5a-5h supporting the conductor between the lines, respectively.

Description

  Embodiments described herein relate generally to a gas insulated switchgear.

  In an GIS (Gas Insulated Switchgear) having a double bus configuration, two insulation spacers are provided between the lines in order to prevent the accident from spreading to other lines when an accident occurs in the bus section. Considering the disassembly workability at the time of an accident, a detachable device is arranged for each line. When the accident recovery operation is performed with such a configuration, a differential pressure is applied to the insulating spacer between adjacent lines during operation during the attachment / detachment operation.

  In addition, two busbar switching disconnectors are connected using a short connection pipe, and individual gas section insulating spacers are arranged at each connection portion between the short connection pipe and the two busbar switching disconnectors. A gas-insulated switchgear disposed on a lead bus in two bus bar switch disconnectors is disclosed.

JP 7-131910 A

  In the gas-insulated switchgear described above, differential pressure acts on the insulating spacers in the adjacent line during attachment and detachment work during accident recovery work. If the insulating spacer is damaged by this differential pressure, damaged parts and fragments Etc., and high pressure gas is ejected from the damaged part. In such accident recovery work, when ensuring safety during work, the equipment configuration as described above requires decompression of the adjacent line and line stop.

  However, in substations that are important bases, there is a case where it is desired to avoid a decrease in supply reliability due to an outage of an adjacent line at the time of an accident in a GIS double bus.

  The problem to be solved by the present invention is to provide a gas-insulated switchgear that eliminates the need for stop processing of an adjacent line in the restoration work of an accident line.

  In order to solve the above-described problem, a gas insulated switchgear according to one embodiment includes a gas containing encapsulated insulating gas and containing a conductor that serves as an electric circuit and a plurality of lines connected to the bus. Insulated switchgear. The gas-insulated switchgear includes: a bus-side disconnector ground switch provided on the bus side; a line-side disconnector ground switch provided on the plurality of lines; and the bus-side disconnector ground switch for each line A gas circuit breaker provided between a power supply and the line-side disconnector grounding switch, and a detachable device provided between the lines connected to the bus, and detachably connecting or disconnecting the electric circuit of the bus, An insulating spacer that supports the conductor on both sides of the attachment / detachment device, and the first and second gas sections are divided between the lines so that the insulating gas can be sealed on both sides of the attachment / detachment device. It is characterized by that.

  Further, the gas insulated switchgear according to another embodiment is a gas insulated switchgear that contains a bus bar in which an insulating gas is sealed and accommodates a conductor serving as an electric circuit and a plurality of lines connected to the bus bar. The gas-insulated switchgear includes: a bus-side disconnector ground switch provided on the bus side; a line-side disconnector ground switch provided on the plurality of lines; and the bus-side disconnector ground switch for each line A gas circuit breaker that is provided between the gas circuit breaker and the line-side disconnector grounding switch, and that is provided between the gas circuit breaker and the bus-side circuit breaker grounding switch. A disconnecting device for disconnecting the electric circuit interrupted by a device, an attaching / detaching device provided between the lines connected to the bus, and detachably connecting or disconnecting the electric circuit of the bus, and on both sides of the attaching / detaching device, And an insulating spacer that supports the conductor.

  Still another embodiment of the gas-insulated switchgear is a gas-insulated switchgear in which an insulating gas is enclosed and which accommodates a busbar that houses a conductor serving as an electric circuit and a plurality of lines connected to the busbar. . The gas-insulated switchgear includes: a bus-side disconnector ground switch provided on the bus side; a line-side disconnector ground switch provided on the plurality of lines; and the bus-side disconnector ground switch for each line A gas circuit breaker with a built-in disconnector that cuts off and disconnects the electric circuit, and the electric circuit of the bus that is provided between the line connected to the bus. An attachment / detachment device that detachably connects or disconnects, and an insulating spacer that supports the conductor on both sides of the attachment / detachment device.

The top view in 1st Embodiment of the gas insulated switchgear which concerns on this invention. FIG. The single wire connection diagram of FIG. The figure which shows the state before the operation | work after the accident occurrence in the gas insulated switchgear of 1st Embodiment. The figure which shows the state at the time of the operation | work after accident occurrence in the gas insulated switchgear of 1st Embodiment. The top view in 2nd Embodiment of the gas insulated switchgear concerning this invention. FIG. 7 is an elevational sectional view of FIG. 6. The figure which shows the state before the work after the accident occurrence in the gas insulated switchgear of 2nd Embodiment. The figure which shows the state at the time of the operation | work after accident occurrence in the gas insulated switchgear of 2nd Embodiment. The top view in 3rd Embodiment of the gas insulated switchgear concerning this invention. FIG. 11 is an elevational sectional view of FIG. 10.

  Hereinafter, a gas insulated switchgear according to an embodiment of the present invention will be specifically described with reference to the drawings. Here, the same or similar parts are denoted by common reference numerals, and redundant description is omitted. Each of the following embodiments described here will be described by taking an example of a gas insulated switchgear in which an insulating gas is sealed.

[First Embodiment]
A gas insulated switchgear according to a first embodiment of the present invention will be described with reference to FIGS. Here, FIG. 1 is a plan view showing the overall configuration of the gas insulated switchgear according to the first embodiment of the present invention, FIG. 2 is an elevational sectional view of FIG. 1, and FIG. The single wire connection diagram in the gas insulated switchgear shown in FIG. 4 and 5 are diagrams showing a work method after the occurrence of the accident in the gas insulated switchgear shown in FIG. 1. In particular, FIG. 4 is a diagram showing a state before the work in the gas insulated switchgear after the accident occurs. FIG. 5 is a diagram showing a working state of the gas insulated switchgear after the accident occurs.

  As shown in FIGS. 2 and 3, the gas insulated switchgear according to the first embodiment is connected to a multiple bus 10 including a main bus 11 and an adjacent bus 12. In the single-line connection diagram shown in FIG. 3, the first to third lines LA, LB, and LC on the line side are connected to the main bus 11 and the adjacent bus 12 via the gas insulated switchgear of this embodiment, respectively. It shows the connected state. Hereinafter, a case where the gas insulated switchgear according to the first embodiment is installed between the bus side and the line side will be described as an example.

  The gas-insulated switchgear according to the first embodiment accommodates an detachable device, in which an insulating gas is enclosed, and is detachably attached to a plurality of lines in a multiple bus 10 so that the lines can be connected to or disconnected from each other. Insulating spacers that support the conductors while maintaining insulation between the containers and the conductors, and inter-line buses that divide the gas compartments on both sides of the inter-line attaching / detaching device are provided. Each line is connected to a power cable drawn from the outside of the gas insulated switchgear, for example, via a cable head. For example, R, S, and T (phase) shown in FIG. 1 and FIG. 2 are electric circuits, and indicate a bus, a three-phase cable accommodated in a line, a three-phase conductor, and the like.

  Specifically, as shown in FIGS. 1 and 2, the gas-insulated switchgear according to the first embodiment includes first to third gas circuit breakers 1a, 1b and 1c, first to third line sides. Disconnector grounding switches 2a, 2b and 2c and first to third bus-side disconnector grounding switches 3a, 3b and 3c are provided.

  Further, the gas insulated switchgear includes first and second attachment / detachment devices 4a and 4b for a plurality of lines connected to or branched from the main bus 11 and the adjacent bus 12, respectively. As shown in FIG. 1, the first to fourth insulating spacers 5a to 5d and the fifth to eighth insulating spacers 5e to 5d are provided on both sides of the first and second attachment / detachment devices 4a and 4b between the lines. 5h. In addition, a plurality of other insulating spacers 5 are provided for connection between other devices.

  In the gas insulated switchgear, the gas section of the first inter-line bus 6a (first gas section) and the second inter-line bus 6b (second gas section) is provided on both sides of the first attachment / detachment apparatus 4a. Is provided. Similarly, gas sections of a third inter-line bus 6c (third gas section) and a fourth inter-line bus 6d (fourth gas section) are provided on both sides of the second attachment / detachment device 4b.

  For example, these first to fourth inter-line buses 6a, 6b, 6c and 6d are each provided with a valve (not shown) capable of supplying / exhausting an insulating gas for degassing and gas filling. During maintenance work or the like, a pump or the like is used, and pressure reduction processing is performed on the first to fourth inter-bus buses 6a to 6d via this valve.

  The first to third gas circuit breakers 1a, 1b, and 1c are circuit breakers that open and close a current contact between a conductor drawn from the bus side and a conductor drawn from the line side. That is, the first to third gas circuit breakers 1a, 1b and 1c can break the electric circuit.

  As shown in FIG. 3, the first line-side disconnector grounding switch 2 a performs disconnection in the case of, for example, main circuit connection change, line segmentation, equipment inspection and repair, etc., while the electric circuit is in an applied state. There is a disconnector 23a provided on the line side for the purpose. In addition to the disconnector 23a, the first line-side disconnector grounding switch 2a is, for example, for grounding a non-voltage part when the disconnector 23a is open as shown in FIG. It has earthing switches 21a and 22a. The second and third line-side disconnector grounding switches 2b and 2c have the same configuration as shown in FIG.

  As shown in FIG. 3, the first bus-side disconnector grounding switch 3 a performs disconnection in the case of, for example, main circuit connection change, bus segmentation, equipment inspection and repair, etc., while the electric circuit is in an applied state. There is a disconnector 31a provided on the busbar side. In addition to the disconnector 31a, the first bus-side disconnector grounding switch 3a grounds a non-voltage portion when the disconnector 31a is open, for example, as shown in FIG. The earthing switch 32a is provided. Note that the second and third bus-side disconnector grounding switches 3b and 3c have the same configuration as shown in FIG.

  The first and second attachment / detachment devices 4a and 4b are connected to one line and the other so as to be detachable from the connected main bus 11 or the adjacent bus 12 when an internal accident occurs in the main bus 11 or the adjacent bus 12. Are attached to each other (between lines).

  For example, as shown in FIGS. 1 and 3, a first attachment / detachment device 4a is provided between the first line LA and the second line LB in the main bus 11 and the adjacent bus 12, respectively. A first inter-line bus 6a and a second inter-line bus 6b are provided on both sides of the first attachment / detachment device 4a.

  Similarly, a second attachment / detachment device 4b is provided between the second line LB and the third line LC in the main bus 11 and the adjacent bus 12 respectively. A third inter-line bus 6c and a fourth inter-line bus 6d are provided on both sides of the second attachment / detachment device 4b.

  As shown in detail in FIG. 4, the first inter-line bus 6a includes a container 62a, and a conductor 61a connected to the main bus 11 or the adjacent bus 12 is accommodated in the container 62a. The first inter-line bus 6a is provided with an openable / closable valve (not shown). In the first inter-line bus 6a, the insulating gas can be vented or filled with a valve (not shown) during maintenance work or the like.

  The first and second attachment / detachment devices 4a and 4b are provided with the first bus-side disconnector grounding switch 3a, the second and third bus-side disconnector grounding switches 3b and 3c, respectively, during the attaching / detaching operation. In addition, it is possible to secure a space for extraction from the eighth insulating spacers 5a to 5h.

  For this purpose, the first and second attachment / detachment devices 4a and 4b have, for example, a bellows shape in the longitudinal direction of the main bus 11 and can be contracted in the longitudinal direction of the main bus 11 when the device is removed. It is formed to be. The same applies to the adjacent bus 12.

  For example, as shown in FIG. 4, the first attachment / detachment device 4a includes a removable container 42a for storing a removable conductor 41a. Moreover, although not shown in figure, it is the same structure also about the 2nd attachment / detachment apparatus 4b.

  The first to eighth insulating spacers 5a to 5h, and the other insulating spacers 5 support the conductors accommodated in these buses and devices, and maintain the insulation between them and the conductors. And it supports, maintaining the airtightness of the container as mentioned above.

  As shown in FIG. 3, the first bus-side disconnector grounding switch 3a is connected to the main bus 11 and the adjacent bus 12, respectively, and is connected to the first gas circuit breaker 1a. The first gas circuit breaker 1a is connected to the first line-side disconnector ground switch 2a. The gas insulated switchgear is connected to the first line LA via the first line-side disconnector ground switch 2a. Similarly, the gas insulated switchgear is connected to the second line LB and the third line LC via the second line-side disconnector grounding switches 2b and 2c.

  Further, as shown in FIG. 3, a first attachment / detachment device 4a is installed between the first line LA and the second line LB connected to the main bus 11 and the adjacent bus 12, and the second line A second attachment / detachment device 4b is installed between the LB and the third line LC.

  A first gas section (first inter-line bus 6a) and a second gas section (second inter-line bus 6b) are provided in sections on both sides of the first attachment / detachment device 4a. Further, a third gas section (third inter-line bus 6c) and a fourth gas section (fourth inter-line bus 6d) are provided in sections on both sides of the second attachment / detachment device 4b. .

  For example, the first gas section and the second gas section can be depressurized from a rated gas pressure. As a result, in the adjacent line of the accident occurrence line, for example, the first bus side disconnector grounding switch 3a or the second bus side disconnector grounding switch 3b is not decompressed and the rated gas pressure is maintained. Thus, it is possible to operate without stopping the power application from the main bus 11 or the adjacent bus 12.

  In the gas insulated switchgear, as an example, when the main bus 11 (or the adjacent bus 12) is electrically disconnected from one of the lines, first, for example, the first gas circuit breaker 1a is cut, and then the first The operation such as turning off the bus-side disconnector grounding switch 3a and the first line-side disconnector grounding switch 2a is performed.

  The contents described above are the same for the third gas section and the fourth gas section.

  Hereinafter, a work method after the occurrence of an accident in the gas insulated switchgear shown in FIG. 1 will be described with reference to FIGS. 4 and 5. For example, FIG. 4 shows the state of the switches (switches) in each device and the connection conductors when an internal fault TX such as a short-circuit fault occurs in the first bus-side disconnector ground switch 3a. . FIG. 5 shows the state of the switches (switches) and the connection conductors in each device, particularly when the restoration work after the occurrence of the internal accident TX of the first bus side disconnector grounding switch 3a is performed. Indicates.

  In the first and second inter-line buses 6a and 6b (first and second gas sections) shown in FIGS. 4 and 5, for example, a valve (supply / exhaust valve (not shown)) is provided to perform a degassing operation. It can be carried out. In addition, first and second insulating spacers 5a and 5b are provided on both sides of the first gas section, and third and fourth insulating spacers 5c and 5d are provided on both sides of the second gas section. Yes. Although not shown in FIGS. 4 and 5, fifth to eighth insulating spacers 5e, 5f, 5g as shown in FIG. 1 are provided on both sides of the third gas section and on both sides of the fourth gas section. 5h is similarly provided.

  As shown in FIG. 4, the first inter-line bus 6a is composed of a container 62a, and a conductor 61a connected to the main bus 11 or the adjacent bus 12 is accommodated in the container 62a. The second inter-line bus 6b includes a container 62b, and a conductor 61b connected to the main bus 11 or the adjacent bus 12 is accommodated in the container 62b.

  As shown in FIG. 4, in the first bus-side disconnect grounding opener 3a, the main bus 11 is supported by the insulating spacer 5, and in the first gas section, the conductor 61a connected to the main bus 11 is the first and It is supported by the second insulating spacers 5a and 5b. The adjacent bus 12 has the same configuration.

  For example, if a differential pressure between atmospheric pressure and high pressure gas is applied to the third and fourth insulating spacers 5c and 5d shown in FIG. 5, the third and fourth insulating spacers 5c and 5d are ruptured by this differential pressure. there's a possibility that. In order to avoid such a situation, in the gas insulated switchgear according to the first embodiment, as described above, the operator performs a decompression process on the first gas compartment shown in FIG. 5 via a valve (not shown).

  And after an operator collect | recovers the gas in the 1st attachment / detachment apparatus 4a, as shown in FIG. 5, the 1st attachment / detachment apparatus 4a is removed from the bus | bath 6a between 1st lines.

  On the other hand, since the gas pressure of the second bus-side disconnector grounding switch 3b can be kept at the rated gas pressure, the gas in the first attachment / detachment device 4a is recovered in such a restoration operation. There is only a small amount of gas emission and supply. For this reason, working time can be shortened compared with collect | recovering the insulating gas of the compound bus 10 whole containing the main bus-line 11 and the adjacent bus-line 12. FIG. Further, as in the example described above, it is possible to perform the restoration work without interrupting only the charging of the line where the accident occurred and stopping the charging of the adjacent line on the sound side.

  In the gas insulated switchgear according to the first embodiment, as shown in FIG. 4, for example, both sides of the first attachment / detachment device 4a are divided into first and second gas compartments, and the gas compartments are made independent. Thereby, in the 1st and 2nd gas division, the gas supply at the time of degassing at the time of decompression processing and gas filling becomes possible via the valve which is not illustrated.

  A portion with a wide slanted line interval shown in FIG. 5 indicates that the second gas section is decompressed, and a portion with a slanted line interval illustrated in FIG. 5 indicates that the rated gas pressure is maintained. Moreover, the white background part shown in FIG. 5 shows having released to atmospheric pressure. This also applies to FIG. 9 described later.

  The second bus-side disconnector ground switch 3b on the line side (for example, the second line LB) where the internal accident TX has not occurred can be maintained at the rated gas pressure. On the other hand, in the line where the internal accident TX has occurred (for example, the first line LA), the first bus-side disconnector grounding switch 3a, the first inter-bus line 6a, and the first attachment / detachment device 4a are at atmospheric pressure. To be released.

  In the first embodiment, such pressure reduction work is performed by a valve (not shown) attached to the first inter-line bus 6a in the main bus 11 on the line side where no internal accident TX has occurred by an operator or the like. ), And the gas pressure in the first gas section can be reduced to an appropriate differential pressure.

  That is, in the example of FIG. 5, in the recovery operation after the internal accident TX, the first gas section or the second gas section can be reduced to a gas pressure intermediate between the atmospheric pressure and the rated gas pressure. Thereby, in the first embodiment, for example, the differential pressure applied to the fourth insulating spacer 5d can be made smaller than the differential pressure between the atmospheric pressure and the rated gas pressure. Thereby, since it can adjust so that it may not become an excessive differential pressure | voltage, it can prevent an excessive differential pressure | voltage being added to the 4th insulating spacer 5d. As a result, it is possible to prevent damage to the fourth insulating spacer 5d due to excessive differential pressure.

  In addition, as shown in FIG. 5, for example, the second inter-line bus 6b located in the adjacent space of the work space is depressurized, and the second bus-side disconnector grounding connected to the second inter-line bus 6b is grounded. The switch 3b is not decompressed. Thereby, in 1st Embodiment, since the adjacent space of work space can be made into the pressure-reduced gas area, the safety | security of work space can be ensured. Thereby, an operator can perform the removal operation | work of the 1st attachment / detachment apparatus 4a safely.

  The removal operation of the first attachment / detachment device 4a shown in FIG. 5 includes, for example, contracting the bellows shape of the first attachment / detachment device 4a in the longitudinal direction of the main bus 11, and the conductor of the first attachment / detachment device 4a The connection with the conductor of the inter-line bus 6a is removed, and the first attachment / detachment device 4a is separated from the first inter-line bus 6a.

  On the other hand, after removing the first attachment / detachment device 4a, when the restoration work for the accident occurrence target line (the adjacent bus on the first bus side disconnector grounding switch 3a side shown in FIG. 5) is completed, The attachment / detachment device 4a is returned to a predetermined position, and the shape of the first attachment / detachment device 4a having a bellows shape is extended in the longitudinal direction of the main bus bar 11 and connected to the line so that the attachment can be easily performed.

  As described above, in the gas insulated switchgear according to the first embodiment, for example, the first attaching / detaching device 4a, the four first to fourth insulating spacers 5a to 5d, the main bus 11 and the adjacent bus 12 Each has a gas compartment between the lines. For example, when an internal accident occurs in any one line of the main bus 11, by depressurizing the gas compartment provided between the lines on the one line side with the first attachment / detachment device 4a interposed therebetween, Recovery processing can be performed without reducing the gas pressure in another healthy line.

  Therefore, according to the first embodiment, in such restoration processing, for example, in the disassembly work of the first attachment / detachment device 4a after the occurrence of the internal accident TX, the second bus-side disconnector grounding switch 3b and the second Safety during work can be ensured by reducing the pressure of the second gas section (second inter-line bus 6b) provided between the 1 attachment / detachment device 4a. Further, the operation can be performed without reducing the pressure of the second bus-side disconnector grounding switch 3b on the healthy side, and the operation can be continued without stopping the power application of the adjacent line that is not the accident occurrence line. The same applies to the case where an accident occurs due to the reverse line relationship.

  As described above, according to the first embodiment, the gas insulation that combines the safety during operation and the supply reliability and eliminates the need to reduce the gas pressure and stop the line in the adjacent line of the accident occurrence line. An opening / closing device can be provided.

[Second Embodiment]
FIG. 6 is a plan view of a gas insulated switchgear according to a second embodiment of the present invention. 7 is an elevational sectional view of the gas insulated switchgear shown in FIG. 8 and 9 are diagrams showing a work method after the occurrence of the accident in the gas insulated switchgear shown in FIGS. 6 and 7. In particular, FIG. 8 shows a state before the work in the gas insulated switchgear after the accident occurs. FIG. 9 is a diagram showing a state during operation in the gas insulated switchgear after the accident occurs.

  As shown in FIGS. 6 and 7, the gas insulated switchgear according to the second embodiment includes first to third gas circuit breakers 1a, 1b and 1c, first to third line side disconnectors grounding switch. 2a, 2b and 2c, first to third bus-side disconnectors ground switches 3a, 3b and 3c, and first to third disconnecting devices 7a, 7b and 7c. Further, the gas insulated switchgear includes first and second attachment / detachment devices 4 a and 4 b for each line between the main bus 11 and the adjacent bus 12. A plurality of insulating spacers 5 are provided between the lines.

  The first line LA is further connected to the first bus-side disconnector grounding switch 3a via the first line-side disconnector grounding switch 2a, the first gas circuit breaker 1a, and the first disconnecting device 7a. To the main bus 11 and the adjacent bus 12.

  Similarly, the second line LB is further grounded via the second line side disconnector grounding switch 2b, the second gas circuit breaker 1b, and the second disconnecting device 7b. It is connected to main bus 11 and adjacent bus 12 via switch 3b.

  Further, the third line LC is further connected to the third bus-side disconnector ground switch via the third line-side disconnector ground switch 2c, the third gas circuit breaker 1c, and the third disconnecting device 7c. The main bus 11 and the adjacent bus 12 are connected to each other through the device 3c.

  These first to third gas circuit breakers 1a, 1b and 1c can cut off the respective electric circuits. Further, the first to third disconnecting devices 7a, 7b, and 7c can disconnect the devices connected to the electric circuit with respect to the interrupted electric circuits.

  In the main bus line 11 and the adjacent bus line 12, a first attachment / detachment device 4a is installed between the first line LA and the second line LB, and the second line LB and the third line LC are connected to each other. A second attachment / detachment device 4b is installed between each.

  A plurality of insulating spacers 5 are interposed between these devices.

  The main differences between the gas-insulated switchgear according to the second embodiment shown in FIGS. 6 and 7 and the gas-insulated switchgear according to the first embodiment shown in FIGS. 1 and 2 are the first to third. Disconnecting devices 7a, 7b and 7c are provided between the first to third gas circuit breakers 1a, 1b and 1c and the first to third bus-side disconnectors grounding switches 3a, 3b and 3c. It is a point.

  In the gas insulated switchgear according to the second embodiment, for example, after the internal accident TX as shown in FIG. 8 and before the disassembly work of the first attachment / detachment device 4a, the first gas circuit breaker 1a and the first bus side The electrical circuit is disconnected by the disconnector 71a of the first disconnecting device 7a located between the disconnector grounding switch 3a. In this case, the operator disconnects the electric circuit from the working state as shown in FIG. 8 by the first disconnecting device 7a, thereby adjacent to the accident line (first line LA) (second line). It is only necessary to perform the decompression process of the second bus side disconnector grounding switch 3b on the LB) side.

  Accordingly, as shown in FIG. 9, the insulating spacer 5 interposed between the second bus-side disconnector grounding switch 3b and the second disconnecting device 7b (having the disconnecting device 71b shown in FIG. 8). However, since the differential pressure is the difference between the rated gas pressure and the pressure reduced below that, no transient pressure is applied to the insulating spacer 5. Further, no transient pressure is applied to the insulating spacer 5 between the first attachment / detachment device 4a and the second bus-side disconnector ground switch 3b.

  Under such circumstances, as shown in FIG. 9, the worker can safely disassemble the first attachment / detachment device 4a in order to restore the accident line (first line LA line). it can.

  Furthermore, the operation can be continued without stopping the charging of the adjacent line that is not the accident occurrence line. The same applies to the case where an accident occurs due to the reverse line relationship.

  As described above, according to the gas insulated switchgear of the second embodiment, for example, in the disassembly work of the first attachment / detachment device 4a at the time of the internal accident TX, the first bus-side disconnector grounding switch 3a and the first switch The accident line can be separated by the first disconnecting device 7a provided between the gas circuit breakers 1a, and the second disconnecting device 7b of the adjacent line can be operated without decompression processing. The accident line can be restored without stopping the adjacent line.

  As described above, according to the second embodiment, it is possible to provide a gas-insulated switchgear that eliminates the need for stop processing of an adjacent line of an accident occurrence line, which has both safety during operation and supply reliability. it can.

[Third Embodiment]
FIG. 10 is a plan view of a third embodiment of the gas insulated switchgear according to the present invention. FIG. 11 is an elevational sectional view of the gas insulated switchgear shown in FIG.

  As shown in FIGS. 10 and 11, the gas insulated switchgear according to the third embodiment includes first and second built-in gas circuit breakers 13a and 13b, first and second line-side disconnectors grounded. Switches 2a and 2b, and first and second bus-side disconnectors ground switches 3a and 3b are provided.

  The first line LA is mainly connected via the first line side disconnector grounding switch 2a and the first disconnector built-in gas circuit breaker 13a, and further via the first bus side disconnector grounding switch 3a. Connected to bus 11 and adjacent bus 12.

  Similarly, the second line LB is further connected to the second bus-side disconnector ground switch 3b via the second line-side disconnector ground switch 2b and the second disconnector built-in gas circuit breaker 13b. To the main bus 11 and the adjacent bus 12.

  In addition, a first attachment / detachment device 4a is installed between the first line LA and the second line LB in the main bus line 11 and the adjacent bus line 12, respectively.

  The first circuit breaker built-in gas circuit breaker 13a has a plurality of switches 14 connected to the main bus bar 11 and the adjacent bus bar 12 therein. Similarly, the second circuit breaker built-in gas circuit breaker 13b also has a plurality of switches 14 connected to the main bus bar 11 and the adjacent bus bar 12.

  As shown in FIGS. 10 and 11, a plurality of insulating spacers 5 are interposed between these devices.

  The first and second disconnector built-in gas circuit breakers 13a and 13b have a switch 14 that can disconnect the electric circuit, and can safely disconnect the electric circuit and disconnect the electric circuit. Thus, for example, when the first line LA is an accident line, the first line LA is disconnected from the main bus 11 and the adjacent bus 12 by disconnecting the switch 14 of the first circuit breaker built-in gas circuit breaker 13a. Furthermore, the second line LB, which is an adjacent line, can be disconnected by the first attachment / detachment device 4a.

  As described above, the first breaker built-in gas circuit breaker 13a and the like have a separating device built in the gas circuit breaker.

  According to the third embodiment, the second disconnector built-in gas circuit breaker 13b of the second line LB that is not the accident line can be disconnected from the accident line by the first attachment / detachment device 4a without decompression processing. It becomes.

  As a result, the operation can be continued without stopping the charging of the adjacent line that is not the accident occurrence line. The same applies to the case where an accident occurs due to the reverse line relationship.

  As described above, according to the third embodiment, in addition to the same effects as those of the gas insulated switchgear according to the second embodiment, for example, the first gas circuit breaker 1a in the second embodiment and Since the first disconnector built-in gas circuit breaker 13a has the function of the first disconnecting device 7a, the installation space of the gas insulated switchgear can be reduced. Therefore, the installation installation area of the gas insulated switchgear can be reduced as compared with the first and second embodiments.

[Other Embodiments]
As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. For example, the present invention can be applied to a power system having a similar device other than the gas insulated switchgear. Moreover, you may combine the characteristic of each embodiment. Furthermore, these embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof as well as included in the scope and gist of the invention.

  DESCRIPTION OF SYMBOLS 1a ... 1st gas circuit breaker, 1b ... 2nd gas circuit breaker, 1c ... 3rd gas circuit breaker, 2a ... 1st line side disconnector earthing switch, 2b ... 2nd line side circuit breaker grounding Switch, 2c, third line side disconnector ground switch, 3a, first bus side disconnector ground switch, 3b, second bus side disconnector ground switch, 3c, third bus side disconnect Earthing switch, 4a ... first attaching / detaching device, 4b ... second attaching / detaching device, 5 ... insulating spacer, 5a ... first insulating spacer, 5b ... second insulating spacer, 5c ... third insulating spacer, 5d ... 4th insulating spacer, 5e ... 5th insulating spacer, 5f ... 6th insulating spacer, 5g ... 7th insulating spacer, 5h ... 8th insulating spacer, 6a ... 1st line | wire bus line, 6b ... second inter-bus bus, 6c ... third inter-bus bus, 6d ... fourth inter-bus bus, 7a ... first disconnect Device 7b second separation device 7c third separation device 10 double bus 11 main bus 12 adjacent bus 13a first breaker built-in gas circuit breaker 13b 2nd gas switch built-in circuit breaker, 14 ... switch, 21a, 21b, 21c, 22a, 22b, 22c ... ground switch, 23a, 23b, 23c ... disconnector, 31a, 31b, 31c ... disconnector, 32a, 32b, 32c ... ground switch, 41a ... conductor, 42a ... container, 61a, 61b ... conductor, 62a, 62b ... container, 71a, 71b ... disconnector

Claims (6)

A gas-insulated switchgear that accommodates a bus that encloses an insulating gas and accommodates a conductor serving as an electric circuit, and a plurality of lines connected to the bus,
A bus-side disconnector grounding switch provided on the bus-side,
A line-side disconnector ground switch provided on the plurality of lines; and
A gas circuit breaker provided between the bus-side disconnector ground switch and the line-side disconnector ground switch for each line;
An attachment / detachment device that is provided between the lines connected to the busbar, and that detachably connects or disconnects the electric circuit of the busbar;
An insulating spacer that supports the conductor on both sides of the attachment / detachment device;
A gas insulated switchgear characterized in that the first and second gas compartments are partitioned between the lines so that the insulating gas can be sealed on both sides of the detachable device. The gas insulated switchgear according to claim 1, wherein the first and second gas compartments are provided with valves capable of supplying and exhausting the insulating gas. The insulating spacer is provided in each of the first and second gas compartments in order to separate the first and second gas compartments between the lines. Item 3. A gas insulated switchgear according to Item 2. The conductor includes a first conductor and a second conductor;
The busbar accommodates the first conductor in a first container that can enclose the insulating gas,
The attachment / detachment device includes the second conductor that is detachable in the longitudinal direction of the bus bar and a second container that is extendable and detachable in the longitudinal direction, and is extended from the bus bar. The said 2nd conductor arrange | positioned between the said 1st conductors and accommodated in the said 2nd container is attached so that attachment or detachment is possible. The Claim 1 thru | or 3 characterized by the above-mentioned. Gas insulated switchgear. A gas-insulated switchgear that accommodates a bus that encloses an insulating gas and accommodates a conductor serving as an electric circuit, and a plurality of lines connected to the bus,
A bus-side disconnector grounding switch provided on the bus-side,
A line-side disconnector ground switch provided on the plurality of lines; and
A gas circuit breaker that is provided between the bus-side disconnector ground switch and the line-side disconnector ground switch for each line, and that interrupts the electrical circuit;
A disconnecting device that is provided between the gas circuit breaker and the busbar side disconnector ground switch, and disconnects the electric circuit interrupted by the gas circuit breaker;
An attachment / detachment device that is provided between the lines connected to the busbar, and that detachably connects or disconnects the electric circuit of the busbar;
An insulating spacer that supports the conductor on both sides of the detachable device;
A gas insulated switchgear characterized by comprising: A gas-insulated switchgear that accommodates a bus that encloses an insulating gas and accommodates a conductor serving as an electric circuit, and a plurality of lines connected to the bus,
A bus-side disconnector grounding switch provided on the bus-side,
A line-side disconnector ground switch provided on the plurality of lines; and
A gas circuit breaker with built-in disconnector that is provided between the bus-side disconnector ground switch and the line-side disconnector ground switch for each line, and that cuts off and disconnects the electrical circuit;
An attachment / detachment device that is provided between the lines connected to the busbar, and that detachably connects or disconnects the electric circuit of the busbar;
An insulating spacer that supports the conductor on both sides of the detachable device;
A gas insulated switchgear characterized by comprising:

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