JPH07123546A - Gas insulated switchgear - Google Patents

Abstract

PURPOSE:To reduce the size of an enclosure for a circuit breaker by housing a current transformer through an insulation spacer in a dedicated enclosure, disposing an enclosure housing the ground switches at the opposite ends of an interrupting section on one end face of the enclosure for circuit breaker, and setting the operating direction of the mover in the ground switch in parallel with that of the mover at the interrupting section. CONSTITUTION:A current transformer 7 is housed through an insulating spacer 15 in an enclosure dedicated for a circuit breaker. An enclosure 25 housing the ground switches 5a, 8a at the opposite ends of an interrupting section in parallel is disposed on one end face of the enclosure 16 for the circuit breaker. The operating direction of mover in the ground switch 5a, 8a is set in parallel with that of mover at the interrupting section. A switch control box 14 is disposed on the base 18 of gas insulated switchgear thus reducing the height and size of the enclosure 16 for the circuit breaker. This structure enhances the measurement accuracy of current transformer and reducing the installation space thus enhancing the maintenance and inspection performance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is particularly intended to connect a plurality of main busses to a three-phase batch type gas circuit breaker to improve the maintenance and inspection of each operating device of a disconnecting switch and a grounding switch and to reduce the size thereof. Gas insulated switchgear.

[0002]

2. Description of the Related Art In general, a gas-insulated switchgear for a double-bus system line circuit has a busbar-side disconnector for each double-busbar via an insulating spacer provided on one side of a circuit breaker-sealed container. It is connected to the busbar side maintenance inspection ground switch provided on the same side of the sealed container. This bus-side maintenance inspection grounding switch is connected to one terminal of the breaker, and the other terminal is connected to the current transformer. The current transformer is connected to one terminal of the ground side switch for maintenance and inspection on the line side provided on the same side of the circuit breaker sealed container, and that terminal is connected via the insulating spacer provided on the other side of the circuit breaker sealed container. Connected to the power cable. The switchgear control box is installed in a space separated from the gas-insulated switchgear body by the spacer for maintenance and inspection of each actuator.

The operating device of the line side disconnecting switch is installed on the side surface of the container, and the operating device of the grounding switch for maintenance and inspection is adjacent to each operating device. Here, the link mechanism for connecting the track side maintenance inspection switch and its operating device has an oblique structure.

[0004]

As described above, in the conventional gas-insulated switchgear, the current transformer is arranged at the upper portion of the breaker so that the current transformer is fitted to the connection conductor from one end of the breaker. When arranging, the height of the circuit breaker sealed container increases. Furthermore, the accuracy of the current transformer is reduced due to the influence of the high temperature gas caused by the blowout of the arc during operation of the breaker. To prevent this, it was necessary to increase the circuit breaker sealed container diameter.

The track-side maintenance / inspection grounding switch is installed at a high place, and its operation link mechanism has an oblique structure, which makes adjustment difficult in terms of work.

Further, since the switch control box is separated from the gas-insulated switchgear main body, a large installation space is required.

An object of the present invention is to provide a gas-insulated switchgear which improves the measurement accuracy of a current transformer, miniaturizes a circuit breaker sealed container, improves the maintenance and inspection of each operating device, and reduces the installation space. Especially.

[0008]

A gas-insulated switchgear according to the present invention has a current transformer housed in a dedicated hermetically sealed container via an insulating spacer, and one end face of the circuit breaker hermetically sealed container has grounding switches at both ends of the interruption part. Arrangement of the containers in parallel, the operation direction of the mover of the earthing switch is made parallel to the operation direction of the shutoff part mover, and the operation of each earthing switch and the disconnector for the busbar in the switch control box. It is characterized in that the switchgear is housed and the switch control box is arranged in parallel with the busbar cross section and on the breaker body base.

[0009]

According to the present invention, since the current transformer is arranged in the exclusive hermetic container, the height and diameter of the circuit breaker hermetic container are reduced,
The current transformer measurement accuracy is improved.

Further, the grounding space can be reduced by disposing the switch control box on the gas-insulated switch main body base in the vicinity of the circuit breaker sealed container.

Further, by disposing a container accommodating the grounding switches at both ends of the circuit breaker in parallel on one end face of the circuit breaker sealed container, the circuit breaker sealed container and the grounded switch sealed container can be attached and detached. Maintenance and inspection of the earthing switch becomes easy,
Furthermore, by using a link mechanism in which rods that are easy to adjust in work are orthogonal to each other, by storing the operating device in the switch control box along with other operating devices in a horizontal row at eye level,
It is possible to improve the maintenance and inspection of each operating device.

[0012]

EXAMPLES The present invention will be described with reference to the examples shown in FIGS.

1, the gas-insulated switchgear of the present invention is different from the conventional gas-insulated switchgear of FIG.
6, the container 25 in which the grounding switches 5a and 8a at both ends of the breaker are accommodated in parallel is arranged on one end surface of the breaker hermetically sealed container 16, and the moving direction of the mover of the grounding switch is changed to the breaker. Make it parallel to the moving direction of the mover. The switch control box 14 is arranged on the gas-insulated switchgear main body base 18. Therefore, the height and diameter of the circuit breaker sealed container 16 are reduced, and the measurement accuracy of the current transformer is improved. Also, the installation space can be reduced,
Improves maintenance and inspection of the main body of each earthing / closing switch for maintenance and inspection.

The current transformer 7 is connected to one terminal of the line-side disconnector 19a via an insulating spacer 12 at the end face opposite to the circuit breaker hermetically sealed container 16, and the terminal is grounded via an insulating spacer 24 to the terminal. The switch 20 a is connected to the power cable 22 via the power cable terminal 21. Here, the line-side disconnector operating device 19b and the line-side grounding switch operating device 20b are housed in an operation device container 23 installed in a space below the current transformer sealed container 17. Therefore, each operation unit can be installed at a low position and a sufficient space between bays can be secured, which improves the workability of maintenance and inspection.

As shown in FIG. 2, operators 3b, 4b, 5 for each busbar-side disconnector at both ends of the breaker and for a ground switch for maintenance and inspection.
b and 8b are arranged in a horizontal row in the switch control box 14 around the eye height. Therefore, the maintenance and inspection of the grounding switch for maintenance and operation of the bus-side disconnector is improved.

As shown in FIG. 3, each ground switch operator 5
The operation links 5d and 8d are rotatably attached to both side surfaces of the circuit breaker hermetically sealed container 16 which are at the same height as b and 8b and are orthogonal to the side surfaces to which the main buses 1 and 2 are connected. The links 5c and 8c respectively installed on the grounding switches 5b and 8b are connected via rods 5e and 8e, respectively, and the operation links 5d and 8d and the operating devices 5b for the grounding switches in the switch control box 14 are connected. 8b has a link mechanism for connecting them via the operating rods 5f, 8f, respectively, where the rods 5e, 8e and the operating rods 5f,
8f and 8f, respectively.

Further, the operation links 3d, 4 are attached to the supports 3g, 4g attached to the outer surface of the switch control box 14 on the busbar side.
d is rotatably attached at the same height as the disconnecting switch operating devices 3b, 4b in the switch control box 14, and its operating link 3d,
4d and the links 3c and 4c respectively installed on the busbar side disconnectors 3a and 4a are connected via rods 3e and 4e, respectively, and the operation links 3d and 4d and the disconnector operator 3b in the switchgear control box 14, 4b and the operating rod 3 respectively
It has a link mechanism for connecting via f and 4f. Here, the rods 3e and 4e and the operation rods 3f and 4f are at positions orthogonal to each other. Therefore, the work adjustment of the link mechanism for connecting the maintenance / inspection earthing switch and the operating device becomes easy.

As shown in FIG. 4, a configuration in which an external bushing 26 is connected instead of the power cable 22 in FIG. 1 is generally considered. The line side disconnector 19a and the grounding switch 20a may be arranged vertically.

In FIG. 5, the line-side disconnecting switch operating device 19b and the grounding switch operating device 20b in FIG. 1 are also replaced by bus-side disconnecting switch operating devices 3b and 4b, and maintenance / inspection grounding switch operating device 5
An example in which it is housed in the switch control box 14 as in the case of b and 8b is shown. With this configuration, the overall size of the apparatus can be reduced and the maintenance and inspection of the operating device can be further improved.

FIG. 6 shows an example in which the line-side disconnecting switch operating device operating device 19b and the earthing switch operating device 20b in FIG. 1 are installed near the sealed container 16 and on the opposite side of the current transformer 7. With this configuration, maintenance and inspection of each operating device can be performed from the outside of the gas-insulated switchgear.

FIG. 7 shows the configuration when one power cable is added in FIG. In FIG. 1, when one line of the power cable is added, it is possible to work without collecting the gas in the gas section of the line side disconnector.

FIG. 8 shows an example in which the blocking portion in FIG. 1 has a horizontal structure.

[0023]

According to the present invention, the current transformer is housed in the current transformer dedicated unit, and the space below the main busbar is limited to the space for the breaker operating device container. The height and diameter of the sealed container can be reduced, and workability can be improved. Further, by disposing the switch control box on the gas insulated switchgear main body base, the installation space can be reduced. Furthermore, by arranging a sealed container that houses the ground switches at both ends of the breaker in parallel on one end face of the circuit breaker sealed container, the operating mechanism is opened and closed using a link mechanism with a structure in which rods are orthogonal to each other with good workability. It can be stored in a horizontal row in the control box along with other operating devices around the eye level, and the maintainability of each operating device can be improved. Furthermore, the sealed container for the earthing switch can be attached and detached, which improves the maintenance and inspection of the earthing switch body.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a gas-insulated switchgear according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is a sectional view showing a second embodiment of the present invention.

FIG. 5 is a sectional view showing a third embodiment of the present invention.

FIG. 6 is a sectional view showing a fourth embodiment of the present invention.

FIG. 7 is a sectional view showing a fifth embodiment of the present invention.

FIG. 8 is a sectional view showing a sixth embodiment of the present invention.

[Explanation of symbols]

1, 2 ... Bus, 3,4 ... Bus side disconnecting switch, 5 ... Bus side maintenance / inspection grounding switch, 6 ... Blocking section, 7 ... Current transformer, 8 ... Track side maintenance / inspection grounding switch, 16 ... Circuit breaker sealed container, 10
... Power cable, 11, 12, 15, 24 ... Insulating spacer, 13 ... Breaker operating device, 14 ... Switch control box, 17
... current transformer sealed container, 18 ... gas insulated switchgear base, 1
9 ... Line side disconnecting switch, 20 ... Line side grounding switch, 21 ... Power cable terminal, 22 ... Power cable, 23 ... Operator container, 25 ... Maintenance inspection grounding switch container.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Koichi Nakano 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside the Kokubun Plant, Hitachi, Ltd. (72) Inventor Takehiro Kikuchi 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture No. 1 Stock company Hitachi Kokubu factory

Claims (12)

[Claims] 1. A grounded hermetically-sealed container for enclosing an insulating gas therein and housing a three-phase shutoff part, and at least one of the shutoff parts for the respective phases via an insulating spacer on one side of the grounded hermetically-sealed container. In a gas-insulated switchgear having a busbar-side disconnector connected to a terminal and a busbar-side maintenance and inspection ground switch connected to both terminals of the breaker of each phase and a line-side maintenance and inspection ground switch, the busbar side A container accommodating the maintenance inspection grounding switch and the line-side maintenance inspection grounding switch in parallel is arranged on the end surface of the grounded sealed container on the movable side of the blocking section, and the moving direction of the moving section and the moving direction of the moving section are arranged. A gas-insulated switchgear having a structure in which the components are parallel to each other. 2. The gas according to claim 1, wherein all the busbar-side disconnectors, and each of the busbar-side maintenance / inspection grounding switches and the trackside-side maintenance / inspection grounding switches are housed in a switch control box. Insulation switchgear. 3. The gas-insulated switchgear according to claim 2, wherein the operating devices are housed in a switch control box in a horizontal row. 4. The gas insulated switchgear according to claim 2, wherein the switch control box is arranged on a base for a gas insulated switchgear body. 5. The operation link rotatably mounted on both surfaces of the circuit breaker sealed container in a direction orthogonal to the surface to which the busbar-side disconnector is connected, and the busbar-side maintenance / grounding opening / closing switch according to claim 4. And a link mechanism for connecting the operation links to the operation device in the switch control box by connecting the links installed on the switch and the ground side switch for maintenance and inspection on the track side respectively via rods. A gas-insulated switchgear that has two rods that are orthogonal to each other and that are connected by an operation link. 6. The operation link rotatably supported by a plurality of supports attached to a busbar-side outer surface of the switch control box, and the corresponding busbar-side disconnectors according to claim 5. A link mechanism for connecting the links via respective rods, and connecting the operation links to the operating devices in the switch control box via the respective operating rods; Gas-insulated switchgear with orthogonal rods. 7. The gas-insulated switchgear according to claim 1, wherein a hermetically-sealed container accommodating a current transformer is connected to a side surface of the hermetically-sealed container opposite to a main bus side via an insulating spacer. 8. The gas-insulated switchgear according to claim 7, wherein operating devices for the line-side disconnecting switch and the line-side grounding switch are provided in a lower portion of a hermetically sealed container that houses the current transformer. 9. The switch control box according to claim 1, wherein operators for the main busbar-side disconnector, the maintenance grounding switch, the line-side disconnector, and the line-side grounding switch are built in the switch control box. Gas insulated switchgear. 10. A sealed container for housing the current transformer and a sealed container connected to a side opposite to the blocking portion via an insulating spacer, wherein the sealed container for the line and the disconnector are provided inside the sealed container. Gas-insulated switchgear with a grounding switch for the track. 11. A sealed container for accommodating the current transformer and a sealed container connected to a side opposite to the blocking portion via an insulating spacer, wherein a line disconnector is provided inside the sealed container. A gas-insulated switchgear provided with a grounding switch for a line which is connected to the hermetically sealed container via an insulating spacer. 12. The gas-insulated switchgear according to claim 1, wherein the operation direction of the circuit breaker is horizontal.