JP2002281618A - Gas insulated combined switchgear - Google Patents

Abstract

(57) Abstract: The present invention provides a gas-insulated composite switchgear that is easier to operate, reduces assembly work time, and is superior in inspection workability as compared with a conventional gas-insulated composite switchgear. An insulation container filled with an insulating gas and filled with an insulating gas, a container filled with an insulation gas containing a disconnector connected to one of the insulation containers separated by an insulating gas compartment and filled with an insulating gas; A bushing having a grounding switch or a grounding switch housed in a gas-filled container or a grounding switch for inspecting a circuit breaker, and a bushing connected to the other terminal of the circuit breaker container; In the gas-insulated combined switchgear provided with a current transformer, the grounding switch is disposed near the current transformer and the disconnector, and comprises an operator for the grounding switch and an operator for the disconnector. A gas-insulated composite switchgear arranged side by side and arranged on a side surface of a container housing the disconnector and the grounding switch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated composite switchgear that is easy to operate and easy to maintain and inspect.

[0002]

2. Description of the Related Art FIG. 4 shows an example of the structure of a gas-insulated composite switchgear disclosed in Japanese Patent Application Laid-Open No. 59-25504.
The current transformer 9 has a structure arranged adjacent to one or both of the circuit breakers 7. When the disconnecting switch 7 is arranged coaxially with the shut-off section 3 and the grounding switch 6 is arranged, the length becomes longer in the tank longitudinal direction. Further, if a ground switch for inspection is arranged between the circuit breaker and the disconnecting switch, the tank needs to be further lengthened.

[0003] The lengthening in the longitudinal direction is limited in terms of location, and the tank accommodating the disconnector and the earthing switch is arranged above the tank accommodating the circuit breaker without changing the arrangement of the current transformer. A structure has been proposed. In this structure, the disconnecting switch and the earthing switch are arranged at a high position, but the respective operating devices are arranged at a low position in terms of seismic performance and inspection workability. Therefore, it is necessary to lengthen the link mechanism between the disconnecting switch, the grounding switch, and the respective operation devices.

As described above, the structure of the gas insulated composite switchgear in which the grounding switch and the disconnecting switch are arranged between the current transformer and the bushing is long or high in the longitudinal direction of the tank. The link mechanism (number of links, length of the rod) between the earthing switch and disconnector and each of the switches is arranged in order to arrange the switches and disconnectors in a low position for inspection work and on the structure of the mechanical interlock. It becomes longer and the operation and maintenance work are complicated.

Japanese Patent Application Laid-Open No. 56-123713 discloses that each operating mechanism of a device unit forming a gas insulated switchgear such as a circuit breaker unit and a circuit breaker unit is mounted at one end in the longitudinal direction so as to be in the same direction. Accordingly, there is a disclosure that the walking distance of the maintenance staff during the maintenance and inspection work is reduced and the maintenance and inspection work is facilitated.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a gas insulated composite switchgear having a reduced number of parts and links, a reduced assembly work time, and excellent inspection workability as compared with a conventional gas insulated composite switchgear. An apparatus is provided.

[0007]

The gist of the present invention is as follows.

A cut-off portion container containing the cut-off portion and filled with an insulating gas; a container containing a disconnecting device connected to one of the cut-off portion containers with an insulating gas section connected thereto and filled with the insulating gas;
A bushing having a grounding switch housed in the container filled with the insulating gas or a grounding switch for inspecting the circuit breaker, and a bushing connected to another terminal of the circuit breaker container; In a gas insulated combined switchgear having a current transformer arranged at a lower portion, the grounding switch is disposed near the current transformer and the disconnector, and an operating device for the grounding switch and an operation for the disconnector are provided. A gas-insulated combined switchgear in which devices are arranged side by side and arranged on a side surface of a container accommodating the disconnecting switch and the grounding switch.

In the above-mentioned gas-insulated composite switchgear, the grounding switch is disposed between the current transformer and the disconnector by passing the grounding wire of the grounding switch through the secondary winding of the current transformer. is there.

Further, there is provided a gas insulated composite switchgear having a compact protective cover by reducing the number of links and the rod length of the disconnector, the earthing switch, and the link mechanism of each operating device.

[0011]

FIG. 1 is a single-line diagram showing an embodiment of the present invention. Gas-insulated composite switchgear is a circuit breaker (C
B), a bushing (BG), current transformer (CT), the disconnecting switch (DS), earthing switch (ES _1), a configuration including the inspection earthing switch (ES _2).

FIG. 2 is a plan view showing one embodiment of the gas-insulated composite switchgear based on the single-line diagram of FIG. The circuit breaker is housed in a circuit breaker container 3 filled with an insulating gas, and one side of the circuit breaker is provided with a bushing 1 to which a terminal and a central conductor are connected. A current transformer 9 is arranged below the bushing 1. On the other side of the circuit breaker, a disconnecting switch 7, a grounding switch 6, and a grounding switch 10 for inspection are housed in the same container 8 filled with insulating gas.
Are connected to each other by dividing the gas compartment. The disconnector 7 is arranged coaxially with the circuit breaker. Disconnector 7, ground switch 6
A bushing 1 in which one terminal of a disconnector 7 and a central conductor are connected is disposed on an upper portion of the container in which is stored.

The disconnecting switch 7 and the earthing switch 6 are housed in the same tank so that they are arranged close to each other.
By arranging the disconnecting switches 5 side by side on the side of the container in which the grounding switches 6 and 7 are stored, the link mechanism between the disconnecting switches, the grounding switches and the respective switches can be shortened. The interlock mechanism provided between the operation devices can be shortened.

The arrangement of the earthing switch 6 and the current transformer 9 shortens the length of the tank in the longitudinal direction and further reduces the number of links by arranging the earthing switch, the disconnecting switch and the respective operation devices in the vicinity. The structure is such that a grounding switch is arranged between the current transformer and the circuit breaker.

In the present invention, in order to prevent a malfunction of the current transformer due to a ground current or an induced current, a structure is adopted in which the ground wire 11 passes through the secondary winding of the current transformer 9 as shown in FIG. With such a structure, the circuit breaker and the current transformer 9
Even if a grounding switch is arranged between them, the grounding current or the induced current can be canceled out and malfunction of the current transformer can be prevented.

[0016]

In the gas-insulated combined switchgear of the present invention, the disconnector and the current transformer on the side of the grounding switch are arranged below the bushing with respect to the breaking part, and the disconnector and the grounding switch are changed to the circuit breaker. By being arranged coaxially with the circuit breaker between the flowers, the tank can be made compact in the longitudinal direction or height.

Further, by disposing the grounding switch, the disconnecting switch and the respective operation devices in the vicinity, the number of links and the rod length of the link mechanism are reduced, and the protective cover (snowproof cover, etc.) of the link mechanism is made compact. it can. Further, since the number of parts and the number of links are reduced, assembly work time can be reduced and inspection workability can be improved.

[Brief description of the drawings]

FIG. 1 is a single-line diagram showing one embodiment of a gas-insulated composite switchgear according to the present invention.

FIG. 2 is a plan view showing one embodiment of the gas-insulated composite switchgear based on the single-line diagram of FIG.

FIG. 3 is a plan view showing an embodiment of a grounding method for the gas-insulated composite switchgear according to the present invention.

FIG. 4 is a plan view showing a configuration of a conventional gas-insulated composite switchgear.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... bushing, 2 ... breaker operating device, 3 ... breaking part, 4
... Ground switch, 5 ... Disconnect switch, 6 ... Ground switch, 7 ... Disconnect switch, 8 ... Ground switch and disconnection unit, 9 ...
Current transformer, 10: ground switch for inspection, 11: ground wire.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kenji Iwabuchi 1-1-1 Kokubuncho, Hitachi City, Ibaraki Prefecture F-term in the Electric Systems Division, Hitachi, Ltd. 5G017 AA11 GG01

Claims (3)

[Claims] 1. A container filled with an insulating gas containing a shut-off portion and filled with an insulating gas, and a disconnector connected to one of the cut-off portion containers and separated by an insulating gas gas compartment. A bushing having a grounding switch or a grounding switch housed in a container filled with insulating gas and a grounding switch for checking a circuit breaker, and a bushing connected to the other terminal of the breaker container, and a lower portion of the bushing; In the gas-insulated composite switchgear having a current transformer disposed therein, the grounding switch is disposed near the current transformer and the disconnector, and an actuator for the grounding switch and an operator for the disconnector Are arranged side by side and arranged on the side surface of a container housing the disconnecting switch and the grounding switch. 2. The current switch according to claim 1, wherein the ground wire of the ground switch is passed through the secondary winding of the current transformer, and the ground switch is disposed between the current transformer and the disconnector. Gas-insulated composite switchgear. 3. The gas insulating composite according to claim 1, further comprising a protective cover that is reduced in size by reducing the number of links and the rod length of a link mechanism of a disconnector, a grounding switch, and respective operating devices. Switchgear.