JPH09284927A - Gas-insulation electric equiupment with lightning arrester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the operability of a disconnector for lightning arrester and lessen the number of components and increase the reliability of a sealed section, in a gas-insulation electric equipment which has a plurality of lightning arresters. SOLUTION: A plurality of lightning arresters LA are fastened to one and the same installation stand 14. A disconnector for lightning arrester consists of fixed contactors 2 which are fixed to the container 21 side and movable contactors 4 which are installed at electrodes 7 formed at the heads of the lightning arresters. By operating a movable bar 5 from outside, the lightning arresters and the installation stand are moved and the disconnector for lightning arrester are opened or closed. By this method, the lightning arresters of multiple phases can be disconnected with one-time operation. What's more, a sealed section which supports the movable bar has only one sealing board 9, so the gas-sealing can be increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated electric device such as a gas-insulated switchgear which houses a plurality of lightning arresters in a container.

[0002]

2. Description of the Related Art When performing a withstand voltage test on gas-insulated electrical equipment such as a gas-insulated switchgear (hereinafter referred to as "GIS"), it is necessary to open a surge arrester disconnector and disconnect the surge arrester from the main circuit. A conventional disconnector for a lightning arrester will be described with reference to the drawings. FIG. 4 shows a lightning arrester container of GIS, in which (a) is a side sectional view and (b) is a front view.

In the figure, 21 is a lightning arrester container and 28 is another container of GIS. The lightning arrester LA for three phases is supported and fixed to the flange 8 of the container 21. The surge arrester disconnector includes a fixed contactor 2 provided on the container 21 side and a surge arrester L.
The fixed contactor 3 provided on the A side and both fixed contactors 2 and 3
The movable contactor 4 connects or disconnects the two.

The fixed contact 2 on the container 21 side is a flange 2
It is supported by a bushing 23 attached to No. 2. The fixed contactor 3 on the side of the arrester LA is supported by and electrically connected to the electrode 7 of the arrester LA. Both fixed contacts 2 and 3 have tulip contacts inside thereof. The movable contactor 4 is formed integrally with the tip of the movable rod 5 made of an insulating material. The movable contactor 4 is always in contact with the tulip-shaped contactor of the fixed contactor 3 on the side of the arrester. When the movable rod 5 moves to the left side in the drawing, the movable contactor 4 contacts the fixed contactor 2 on the container 21 side to connect the arrester to the main circuit, and when it moves to the right side, the movable contactor 4 moves to the fixed contactor 2 on the container 21 side. Open and disconnect the arrester from the disconnector.

The other end of the movable rod 5 is held movably in the axial direction by an airtight plate 9 provided in an opening formed in the flange 8. FIG. 4 shows a state in which the surge arrester disconnector is closed. In this state, the movable rod 5 is pushed most into the container 21, and the movable contact 4 short-circuits the fixed contacts 2 and 3. The end of the movable rod 5 is covered with a protective lid 10 attached to the airtight plate 9.

When disconnecting the disconnector for the lightning arrester, the movable cover 4 is fixed to the main circuit side by removing the protective lid 10, attaching the extraction jig to the movable rod 5, and pulling out the movable rod 5 to the outside of the container. Separate from the contactor 2. As a result, the lightning arrester disconnector is opened and the lightning arrester LA is disconnected from the main circuit 26. This operation is performed for each arrester LA of each phase. When connecting the disconnector for the lightning arrester, reverse this procedure.

[0007]

In the conventional lightning arrester disconnecting switch described above, since the disconnecting operation is performed for each phase, the number of operations increases and the operability is poor. Also, a movable rod,
Since the airtight portion and the like are provided for each phase, the number of parts is increased and the cost is increased. Furthermore, since the number of places where the airtight plate is provided increases, the reliability of gas airtightness becomes low.

It is an object of the present invention to improve the operability of a lightning arrester disconnector, reduce the number of parts, and improve the reliability of an airtight portion in a gas-insulated electric device containing a plurality of lightning arresters. Is.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object. The present invention relates to a gas-insulated electric device in which a plurality of lightning arresters are housed in a container. The lightning arrester includes a fixed contact fixed to the container and a movable contact provided at the tip of each lightning arrester and engaged with the fixed contact. Configure a disconnector for use. Then, each arrester is fixed to one common mount, and one end of the movable rod is connected to the mount.
The other end of the movable rod is supported by an airtight plate provided in an opening formed in the container so as to be movable in the axial direction.

The movable rod is operated from the outside, and the mounting base and the plurality of arresters are collectively moved to open and close the arrester disconnector. Thereby, it is possible to connect or disconnect the plurality of lightning arresters to the main circuit by a single operation. Therefore, operability is improved. Further, the mounting base for mounting the plurality of arresters, the movable rod for operating the disconnector for the arrester, and the airtight plate for maintaining the airtightness of the container are shared, so that the number of parts is reduced. Furthermore, since only one airtight plate is required to movably support the movable rod, there is only one airtight portion, and therefore the reliability of gas airtightness is improved.

[0011]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the inside of a lightning arrester container 21 of GIS, (a) is a side sectional view, and (b) is a front view. In the figure, 21 is a lightning arrester container and 28 is a G
It is another container of IS. The three lightning arresters LA that form three phases and are housed in the container 21 are supported and fixed to the common mounting base 14 on the side of the stationary base 6. Lightning arrester L of mounting base 14
On the surface opposite to the surface on which A is attached, a movable rod 5 made of an insulating material
Are connected at one end. The other end of the movable rod 5 is supported by the flange 8 of the container 21 so as to be movable in the axial direction.

A support structure for the movable rod 5 is shown in FIG. An opening 27 through which the movable rod 5 is inserted is formed in the flange 8, and an airtight plate 9 is attached to the outside of the container of the opening 27 with a bolt 41. The other end of the movable rod 5 is supported by this airtight plate 9. The airtight plate 9 and the movable rod 5 are in contact with the flange 8.
An O-ring 12 is provided at the portion contacting the
Keep the airtightness of SF ₆ gas in 1.

Reference numeral 33 is a screw hole formed in the end portion of the movable rod 5, and when the disconnecting operation of the lightning arrester disconnector is performed, a pull-out jig is attached using this screw hole 33. Also, A
Indicates the distance between the mounting base 14 and the guide plate 15, and the mounting base 14 has this distance A when opening and closing the disconnector for the lightning arrester.
It is only movable. 1 and 2 show a state where the movable rod 5 is pushed most into the container 21, and in this state, the end portion of the movable rod 5 is covered by the protective lid 10. The protective lid 10 is fixed to the airtight plate 9 with bolts 42. A guide plate 15 is provided inside the flange 8 in order to guide the axial movement of the movable rod 5.
The movable rod 5 is supported by the guide plate 15 and the airtight plate 9,
It can be moved only in the axial direction.

In order to prevent the mount 14 from rotating around the movable rod 5, a rod-shaped guide 16 is provided on the flange 8.
Is provided. A hole through which the guide 16 is inserted is formed in the mounting base 14. The guide 16 guides the movement of the mounting base 14 in the axial direction. When a rotational force about the movable rod 5 acts on the mounting base 14, the mounting base 14 engages with the guide 16 to prevent rotation. If it is difficult to move the movable rod 5 in the horizontal direction, the number of guides 16 can be increased to deal with it.

A surge arrester disconnector is formed on the tip side of the arrester LA. The surge arrester disconnector is composed of a movable contactor 4 formed on the electrode 7 at the tip of the arrester LA and a fixed contactor 2 fixedly provided on the container 21 side. The fixed contactor 2 is insulated and supported by the bushing 23 attached to the flange 22 with respect to the container 21 and for each phase. Inside the fixed contactor 2, a tulip-shaped contactor (not shown) that fits with the movable contactor 4 is provided.

This fixed contactor 2 is connected via a conductor 24.
It is connected to the main circuit conductor 26 of each phase supported by the insulating spacer 25. The grounding side of the lightning arrester LA is grounded in a usual manner via a flexible conductor. The ground conductor is not shown for simplicity of illustration. Next, the disconnecting operation and the connecting operation of the disconnector for the lightning arrester will be described with reference to FIGS.
This will be described with reference to FIG. 1 and 2 show a state in which a surge arrester disconnector is connected. FIG. 3 shows the relationship between the movable rod 5 and the extraction jig 11 when the disconnecting operation of the surge arrester disconnecting device is completed.

During normal operation of the GIS, as shown in FIGS. 1 and 2, the movable rod 5 is most pushed into the container 21. Therefore, the movable contactor 4 of the disconnector for the lightning arrester
Is in contact with the fixed contact 2, the lightning arrester LA is connected between the main circuit and the ground. When disconnecting the disconnector for the lightning arrester, the protective lid 10 and the bolt 42 to which it is attached
Remove. As a result, the screw hole 33 formed at the rear end of the movable rod 5 is exposed to the outside. Next, as shown in FIG. 3, the guide 31 of the extraction jig 11 is fixed to the airtight plate 9 with the bolt 32. In addition, this bolt 32 is used for the protective lid 10.
It can be attached using the bolt hole of the bolt 42 to which is attached.

The bolt portion 34 at the tip of the extraction jig 11 is screwed into the screw hole 33 formed at the end of the movable rod 5 to integrate the extraction jig 11 and the movable rod 5. After that, the extraction jig 11
And pull the movable rod 5 out of the container 21. As a result, the mounting base 14 and the lightning arrester LA also move, and when the mounting base 14 moves by the stroke A (FIG. 2) until the mounting base 14 hits the guide plate 15, the movement of the movable rod 5 stops.

As a result, the movable contactor 4 provided at the tip of the arrester LA is separated from the fixed contactor 2, the arrester disconnector is opened, and the arrester LA is disconnected from the main circuit 26. In this state, the butterfly bolt 36 is tightened to fix the extraction jig 11 to the guide 31. Next, the connection operation of the surge arrester disconnecting switch will be described.

When connecting the disconnector for a lightning arrester, the butterfly bolt 36 shown in FIG. 3 is loosened to free the extraction jig 11, and then the extraction jig 11 is pushed to push the movable rod 5 into the container 21. As a result, the movable rod 5, the mounting base 14, the lightning arrester L
A moves to the fixed contactor 2 side, the movable contactor 4 of the lightning arrester LA is connected to the fixed contactor 2, and the lightning arrester LA is connected to the main circuit 26.

Then, the drawing jig 11 is removed from the movable rod 5, the guide 31 is removed from the airtight plate 9,
As shown in FIG.
Attach to According to the example described above, since the operation portion that conventionally required three phases can be made into one common operation, the number of disconnection operations and connection operations is reduced,
Operability is improved. Also, the number of parts such as the movable rod and the airtight plate is reduced. Furthermore, since the number of airtight portions is reduced, the reliability of the airtight portion is improved.

[0022]

According to the present invention, in a gas-insulated electric device containing a plurality of lightning arresters, it is possible to improve the operability of the disconnector for the lightning arrester, reduce the number of parts, and improve the reliability of the airtight portion. it can.

[Brief description of drawings]

FIG. 1 is a side sectional view and a front view of a lightning arrester container showing an embodiment of the present invention.

2 is a cross-sectional view showing details of a supporting portion of the movable rod in FIG.

FIG. 3 is a side view showing a state in which an extraction jig is attached to the lightning arrester container of FIG.

FIG. 4 is a side sectional view and a front view of a conventional lightning arrester container.

[Explanation of symbols]

 LA ... Lightning arrester 2 ... Fixed contactor 3 ... Fixed contactor 4 ... Movable contactor 5 ... Movable rod 8 ... Flange 9 ... Airtight plate 10 ... Protective lid 11 ... Extraction jig 12 ... O-ring 14 ... Mounting base 15 ... Guide plate 16 ... Guide 21 ... Lightning arrester container 22 ... Flange 23 ... Bushing 27 ... Opening 31 ... Guide 33 ... Screw hole 36 ... Butterfly bolt

Claims (1)

[Claims] 1. In a gas-insulated electric device having a plurality of lightning arresters housed in a container, a fixed contact fixed to the container side and a movable contact provided at the tip of each lightning arrester and engaged with the fixed contact. A lightning arrester disconnecting switch constituted by a contactor, a mounting base for commonly supporting and fixing the plurality of lightning arresters, a movable rod having one end connected to the mounting base, and the other end for passing the other end of the movable rod. A lightning arrester comprising: an opening formed in a container; and an airtight plate that is provided in the opening and holds the airtightness of the container that supports the movable rod so as to be movable in the axial direction. Gas insulated electrical equipment.