JP2001298816A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-insulated switchgear having a cable end joint which copes with either domestic or overseas use easily, and is easily-connectable also to an element apparatus. SOLUTION: By fitting an L-shaped bushing 2 having a projecting portion 2a capable of connecting a power cable 3 to the underside of a hermetic container 1, apparatus assembling which copes with various constructions and standardization of the combining portion of the connection between the hermetic container 1 and the power cable 3 becomes available.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear filled with an insulating gas, and more particularly to a connection structure of a cable lead-in portion connected to an electric device.

[0002]

2. Description of the Related Art FIG. 6 is a side view showing a connection structure of a cable lead-in portion of a conventional gas insulated switchgear. In FIG. The box 22 is hermetically partitioned. Then, the terminal-processed cable terminal connecting portion 23 is inserted into and connected to the device-directly connected T-type cable terminal connecting box 22.

FIG. 7 is a side view showing a connection structure of a cable lead-in portion of another conventional gas insulated switchgear. In the figure, an epoxy resin straight bushing 24 is formed on the bottom surface of an airtight container 21 so as to be airtight. Have been. And
The cable-terminated connection portion 25 having been subjected to the terminal treatment is inserted into the epoxy resin
Are connected.

[0004]

Since the conventional gas insulated switchgear is configured as described above, the connection structure of the cable lead-in section connected to the electric equipment of the gas insulated switchgear requires the cable termination box. From the bottom side, you must insert a cable that has been terminated at the cable connection part,
There was a problem that workability was poor. In addition, there is a problem in that the gas-insulated switchgear becomes large by mounting the cable end box directly connected to the equipment on the rear surface of the airtight container.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a cable terminal connecting portion which is easy to connect to a cable terminal connecting box without increasing the outer shape of the gas insulated switchgear. It is an object to provide a gas insulated switchgear having the same.

[0006]

According to a first aspect of the present invention, there is provided a gas-insulated switchgear having an airtight container for accommodating an electric device and enclosing an insulating gas. Is provided with an L-shaped bushing having a convex-shaped portion to which a cable can be connected.

A gas insulated switchgear according to a second aspect of the present invention has an airtight container which houses electrical equipment and insulates an insulating gas, and a cable can be connected to a lower end of the airtight container at a tip. Inverted T having two convex shaped parts
A bushing is provided.

According to a third aspect of the present invention, there is provided a gas insulated switchgear having an airtight container housing an electric device and enclosing an insulating gas, and a cable can be connected to a lower end of the airtight container at a tip. Horizontal T with two convex shaped parts
A bushing is provided.

A gas insulated switchgear according to a fourth aspect of the present invention has an airtight container which houses electric equipment and insulates an insulating gas, and a cable can be connected to a lower end of the airtight container at a tip end. A cross-shaped bushing having three convex-shaped portions is provided.

According to a fifth aspect of the present invention, there is provided a gas insulated switchgear having an instrument transformer connected to the convex portion.

In a gas insulated switchgear according to a sixth aspect of the present invention, an instrument transformer or the like is connected via a rubber spacer.

In a gas insulated switchgear according to a seventh aspect of the present invention, the cable and the convex portion are connected via an I-shaped cable terminal which is coaxially processed with the cable.

In a gas insulated switchgear according to an eighth aspect of the present invention, a current transformer is mounted between a mounting portion of the bushing to the airtight container and a convex-shaped portion.

In a gas insulated switchgear according to a ninth aspect of the present invention, when a cable or the like is not connected, the convex-shaped portion is covered with an insulating cap made of insulating rubber.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a connection configuration of a cable lead-in portion of a gas insulated switchgear according to Embodiment 1 of the present invention. In FIG. A power cable 3 having an L-shaped bushing 2 having a convex-shaped portion 2a to which a cable can be connected at a tip thereof, and a connection terminal attached to a tip at an opening of a T-shaped cable head 2b.
And the power cable 3 is connected to the convex-shaped portion 2a. Further, a current transformer 4 can be attached to a portion where the L-shaped bushing 2 is attached to the airtight container 1 and a portion where the power cable 3 is connected.

As described above, the outer shape of the gas-insulated switchgear can be increased by attaching the bushing 2 having the convex-shaped portion 2a to which the power cable 3 can be connected at the end on the lower surface of the airtight container 1. It is possible to obtain a gas insulated switchgear having a cable terminal connection part which is easy to connect to a cable terminal connection box without any problem.

Embodiment 2 FIG. FIG. 2 is a side view showing a connection configuration of a cable lead-in portion of a gas insulated switchgear according to a second embodiment of the present invention. An inverted T-shaped bushing 5 having two mold portions 5a is provided, and two power cables 3 or not shown are provided on the convex shape portion 5a of the inverted T-shaped bushing 5 by a T-shaped cable head 5b. The power cable 3 is connected to an instrument transformer (VT), a lightning arrester (LA), and the like, which are insulated by a resin such as epoxy or insulating rubber. With such a configuration, it is possible to cope with a large current region.

Further, an instrument transformer (VT) and a lightning arrester (L
If A) or the like is epoxy-molded, the connection is made via a rubber insulating spacer. Further, when the power cable 3 is not connected, the power cable 3 is covered with an insulating cap made of insulating rubber so as to withstand the voltage applied to the gas insulated switchgear.

Embodiment 3 FIG. 3 is a side view showing a connection configuration of a cable lead-in portion of a gas insulated switchgear according to a third embodiment of the present invention. A horizontal T-shaped bushing 6 having two mold-shaped portions 6a is provided. A power cable 3 is provided on the convex-shaped portion 6a of the horizontal T-shaped bushing 6 by a T-shaped cable head 6b. The connection is made via an I-shaped cable terminal 7 which is coaxially processed. Although not shown, the power cable 3 may be connected to an instrument transformer (VT), a lightning arrester (LA), or the like. With such a configuration, it is possible to cope with a large current region.

Further, an instrument transformer (VT) and a lightning arrester (L
If A) or the like is epoxy-molded, the connection is made via a rubber insulating spacer. Further, when the power cable 3 is not connected, the power cable 3 is covered with a rubber insulating cap so as to withstand the voltage applied to the gas insulated switchgear.

Embodiment 4 FIG. 4 and 5 are side views showing a connection configuration of a cable lead-in portion of a gas insulated switchgear according to a fourth embodiment of the present invention. In the embodiment shown in FIG. A cross-shaped bushing 8 having three convex portions 8a to which cables can be connected is provided, and the power cable 3 is connected to the convex portions 8a.
Articles are connected. In FIG. 5, the power cable 3 is connected to an instrument transformer (VT) 9 and a lightning arrester (LA) 10 insulated by a resin such as epoxy or insulating rubber. With this configuration, it is possible to cope with a large current region, and it is possible to simultaneously selectively connect the power cable 3, the instrument transformer (VT) 9, the lightning arrester (LA) 10, and the like. Become.

An instrument transformer (VT) 9 and a lightning arrester (L
A) When 10 or the like is epoxy-molded,
The connection is made through a rubber insulating spacer 11. Further, when the power cable 3 is not connected, the power cable 3 is covered with a rubber insulating cap so as to withstand the voltage applied to the gas insulated switchgear.

[0023]

According to the gas-insulated switchgear according to the first aspect of the present invention, the gas-insulated switchgear has an airtight container housing electric equipment and containing an insulating gas. Since the L-shaped bushing having the protruding portion that can be connected is provided, the cable can be easily connected without increasing the outer shape of the gas insulated switchgear.

According to the gas insulated switchgear according to the second aspect of the present invention, the gas insulated switchgear has an airtight container which houses the electric equipment and in which the insulating gas is sealed. Since the inverted T-shaped bushing having two possible convex portions is provided, a device configuration that can respond to various configurations becomes possible.

According to the gas insulated switchgear according to a third aspect of the present invention, the gas insulated switchgear has an airtight container which houses the electric equipment and insulates the insulating gas, and a cable connection is provided at the lower end of the airtight container at the tip. Since the horizontal T-shaped bushing having two possible convex portions is provided, a device configuration that can respond to various configurations becomes possible.

According to a gas insulated switchgear according to a fourth aspect of the present invention, the gas insulated switchgear has an airtight container which houses electrical equipment and insulates an insulating gas, and a cable connection is provided at a lower end of the airtight container at a tip end. Since the cross-shaped bushing having three possible convex portions is provided, a device configuration that can respond to various configurations becomes possible.

According to the gas insulated switchgear according to claim 5 of the present invention, since the instrument transformer and the like are connected to the convex-shaped portion, it is possible to realize a device configuration that can respond to various configurations.

According to the gas insulated switchgear according to claim 6 of the present invention, since the instrument transformer and the like are connected via the rubber spacer, the connecting portion does not come into contact with the outside air.
It is possible to maintain the reliability of the insulation of the connection portion for a long time.

According to the gas insulated switchgear according to the seventh aspect of the present invention, since the cable and the convex-shaped portion are connected via the I-shaped cable terminal which is coaxially processed with the cable, the connection is ensured. It can be carried out.

According to the gas insulated switchgear according to claim 8 of the present invention, since the current transformer is mounted between the mounting portion of the bushing to the airtight container and the convex shape portion, various configurations can be met. Device configuration becomes possible.

According to the gas insulated switchgear according to claim 9 of the present invention, when a cable or the like is not connected,
As the insulating cap made of insulating rubber was put on the convex shape part,
A configuration that can withstand the voltage applied to the switchgear can be provided.

[Brief description of the drawings]

FIG. 1 is a side view showing a gas insulated switchgear according to Embodiment 1 of the present invention.

FIG. 2 is a side view showing a gas-insulated switchgear according to Embodiment 2 of the present invention.

FIG. 3 is a side view showing a gas-insulated switchgear according to Embodiment 3 of the present invention.

FIG. 4 is a side view showing a gas-insulated switchgear according to Embodiment 4 of the present invention.

FIG. 5 is a side view showing a gas-insulated switchgear according to Embodiment 4 of the present invention.

FIG. 6 is a side view showing a conventional gas insulated switchgear.

FIG. 7 is a side view showing a conventional gas insulated switchgear.

[Explanation of symbols]

1 airtight container, 2 L-shaped bushing, 2a, 5a, 6
a, 8a convex shape part, 3 cable, 4 current transformer, 5
Reverse T type bushing, 6 horizontal T type bushing, 7I type cable terminal, 8 cross type bushing, 9 instrument transformer, 11 spacer.

Claims (9)

[Claims] 1. A gas insulated switchgear having an airtight container containing an electrical device and containing an insulating gas,
A gas-insulated switchgear, characterized in that an L-shaped bushing having a convex-shaped portion to which a cable can be connected is provided on the lower surface of the airtight container. 2. A gas insulated switchgear having an airtight container containing an electrical device and containing an insulating gas,
A gas-insulated switchgear, characterized in that an inverted T-shaped bushing having two convex-shaped portions that can be connected to a cable at a tip is provided on a lower surface of the airtight container. 3. A gas insulated switchgear having an airtight container for housing an electric device and enclosing an insulating gas,
A gas-insulated switchgear, characterized in that a horizontal T-shaped bushing having two protruding portions to which a cable can be connected is provided on the lower surface of the airtight container. 4. A gas insulated switchgear having an airtight container containing an electrical device and containing an insulating gas,
A gas insulated switchgear, characterized in that a cross-shaped bushing having three convex-shaped portions at the tip end of which can be connected to a cable is provided on a lower surface of the airtight container. 5. The instrument according to claim 2, wherein an instrument transformer or the like is connected to the convex shape portion.
A gas insulated switchgear according to item 9. 6. The gas insulated switchgear according to claim 5, wherein an instrument transformer or the like is connected via a rubber spacer. 7. The cable according to claim 1, wherein the cable and the convex portion are connected via an I-shaped cable terminal coaxially processed with the cable. Gas insulated switchgear. 8. The gas insulation according to claim 1, wherein a current transformer is mounted between a mounting portion of the bushing to the airtight container and the convex shape portion. Switchgear. 9. The method according to claim 1, wherein when a cable or the like is not connected, an insulating cap made of an insulating rubber is put on the convex-shaped portion. Gas insulated switchgear.