JPH04344108A - Compressed gas insulation switchgear - Google Patents

Abstract

PURPOSE:To provide a compressed gas insulation switchgear, that workableness for mounting a cable on it removably is excellent, and which can easily deal with leading the cable either from its upside or from its downside into it, and moreover which can reduce its setting area. CONSTITUTION:On a front plate 28 of a sealed container 23 into which a compressed insulation gas is filled, provided are upward or downward in order respectively bus bushings 25 for connecting buses 26 with a switchgear from the outside, a disconnector 27, a breaker 30, and a cable bushing 32 for connecting a cable 35 with the switchgear from the outside, and they penetrate through the front plate 28 in an airtight way. In the sealed container 23, the main circuit of the switchgear is so configured that the respective terminals of the bus bushings 25, disconnector 27, breaker 30, and cable bushing 32 are interconnected in a required way.

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 in which a main circuit charging section is housed in a closed container filled with insulating gas.

0002

2. Description of the Related Art Conventionally, gas insulated switch gears of this type include those shown in FIGS. 3 and 4, respectively.

That is, in the system shown in FIG. 3, a vertically rectangular cylindrical airtight container 3 is disposed inside a panel main body 2 installed on a base 1, and a disconnector 4 and a disconnector 4 are installed in the center of the front wall of the container 3. Breaker 5
are installed airtightly through the container 3 to house the respective live parts in the container 3, and a busbar bushing 6 and a cable bushing 7 are airtightly installed through the lower and upper parts of the rear wall of the container 3, respectively. , the terminals of the busbar bushing 6, the disconnector 4, the circuit breaker 5, and the cable bushing 7 are connected by conductors to form a main circuit, and an insulating gas such as SF6 gas is filled in the container 3. , the cable connector 9 of the cable 8 drawn in from the floor is connected to the cable bushing 7.

Note that 10 and 11 are operating devices for the disconnector 4 and the circuit breaker 5, respectively, and 12 is a front door.

Furthermore, in the case shown in FIG. 4, a cable bushing 14 having a built-in instrument current transformer and a zero-phase current transformer is hermetically installed through the upper wall of a vertically long closed container 13, and
A circuit breaker 15, a disconnector 16, and a busbar bushing 17 are installed airtightly through the front wall of the container 13 in order from above. The main circuit is constructed by connecting the terminals with a conductor, and the container 13 is filled with insulating gas.

Note that 18 is a cable connector, 19 and 20 are operating devices for the circuit breaker 15 and disconnector 20, respectively;
1 is a mold bus bar.

[0007]

[Problems to be Solved by the Invention] In the conventional gas insulated switchgear shown in FIG. In order to arrange the cable bushing 7, it is necessary to secure a working space at the rear of the container 3 for inserting and pulling out the cable connector 9. Therefore, there is space for operation and inspection on the front and rear sides of the container 3, respectively. This poses a problem of increasing the size of the entire switchgear.

In the case shown in FIG. 4, the cable bushing 14 is placed on the top surface of the closed container 13,
Since nothing is arranged on the rear surface of the container 13, there is no need to provide the above-mentioned work space on the rear surface of the container 13, and the installation area can be reduced. Since it has to be installed from above, it is difficult to attach the cable and has the disadvantage of poor workability.

[0009] Here, the switchgear of the above-cable lead-in type shown in FIG. As a result, the supporting structure of the container 13, that is, the structure of the pedestal, becomes complicated, making it difficult to manufacture the switchgear, and furthermore, the cable connector 18 must be connected to and removed from the cable bushing 14 inside the pedestal. Therefore, it has the disadvantage of poor workability.

[0010] The present invention has been made with these problems of the prior art in mind, and its purpose is to reduce the installation area and to allow cables to be drawn in either up or down. It is an object of the present invention to provide a gas-insulated switchgear which is also easy to work with when attaching and detaching cables.

[0011]

[Means for Solving the Problems] In order to achieve the above object, in the gas insulated switchgear of the present invention, the front plate of the airtight container filled with an insulating gas is exposed to the bus bar from the outside in order from the top or the bottom. The busbar bushing, disconnector, circuit breaker to which the circuit breaker is connected, and the cable bushing to which the cable is connected from the outside are installed airtightly through each terminal, and the terminals of the busbar bushing, disconnector, circuit breaker, and cable bushing are connected in the container. They are connected to form the main circuit.

0012

[Operation] In the gas-insulated switchgear having the above-mentioned configuration, the cable bushing is hermetically installed through the front plate of the sealed container together with the disconnector, circuit breaker, etc., so the cable connector can be attached and detached from the cable bushing by other means. Like operating and inspecting equipment, this can be easily done from the front of the container.

[0013] When the busbar bushing, disconnector, circuit breaker, and cable bushing are arranged on the front panel of the container from top to bottom, the cable bushing is located at the bottom of the container, so the cable is drawn in below, but the arrangement of each device is Starting from the bottom, the cable bushing can be placed at the top of the container and the cable can be pulled in on top.

[0014]

[Example] An example will be explained using FIGS. 1 and 2. First, in FIG. 1 showing Example 1, 22 is a base, 23 is a vertically elongated semi-cylindrical airtight container, for example, which is erected on the base 22, and an insulating gas such as SF6 gas is sealed inside. The flat front plate 24 is made of a thick plate.

Reference numeral 25 denotes a busbar bushing which is airtightly penetrated through the uppermost left and right sides of the front plate 24 of the container 23 and has three phases arranged in the vertical direction. The busbar 26 is detachably connected to the busbar bushing 25 from the front.

Reference numeral 27 denotes a disconnector that is integrally supported on the rear surface of the mounting plate 28 and is housed in the container 23 and is airtightly penetrated directly below the bus bar bushing 25 on the front plate 24. A dexterity manipulator 29 is supported. Reference numeral 30 denotes a circuit breaker, which is integrally supported on the rear side of the circuit breaker operating device 31, is airtightly penetrated directly below the circuit breaker 27 on the front plate 24, and is housed in the container 23.

Reference numeral 32 denotes a cable bushing which is airtightly penetrated through the lowermost part of the front plate 24 and has three phases arranged in the left and right direction.
7. The respective terminals of the circuit breaker 30 and the cable bushing 32 are connected by conductors for each phase to form a main circuit. 33 is the circuit breaker 30 and the cable bushing 3
It is an instrument current transformer attached to a conductor between two.

A T-shaped cable connector 34 is provided at the tip of a cable 35 raised from a cable pit on the floor and is detachably connected to the cable bushing 32 from the front.

Reference numeral 36 denotes a support frame fixed to the front side of the container 23 on the base 22, and a door 37 that freely opens and closes the front side of the bus bar 26 is attached to the upper part of the front surface of the support frame 36 by screwing or the like. At the same time, a door 38 that opens and closes the front side of each of the disconnector operator 29, the circuit breaker operator 31, and the cable connector 34 is pivotally supported from the center to the lower part of the front surface of the support frame 36.

In the switchgear having such a configuration, the cable bushing 32 is hermetically installed through the front plate 24 like other equipment, rather than through the rear or upper and lower surfaces of the container 23. Attachment and detachment can be performed from the front by opening the door 38, and it is only necessary to secure operation and inspection space at the front of the container 23.

Next, a second embodiment will be explained using FIG. 2. This embodiment is applied to a cable top lead-in system, and is an example of a switchgear of the cable bottom lead-in system shown in FIG. 1 upside down.

That is, on the front plate 24 of the airtight container 23 installed on the base 22 and filled with insulating gas,
From the bottom: busbar bushing 25, disconnector 27, circuit breaker 3
0 and cable bushing 32 are hermetically penetrated, and the respective terminals are connected in the container 23 to form a main circuit, and the cable 3 is drawn in from the ceiling.
The cable connector 34 of No. 5 is detachably connected to the cable bushing 32 from the front.

In the above-described embodiments, a T-shaped cable connector 34 was shown, but it is clear that the cable connector 34 can be implemented in the same manner using a normal L-shaped cable connector.

[0024]

[Effects of the Invention] Since the present invention is constructed as described above, it produces the following effects. The cable bushing is airtightly inserted through the front panel of the airtight container filled with insulating gas along with the disconnector, circuit breaker, etc. that make up the main circuit, and the cable can be connected to and removed from the cable bushing from the front. It is only necessary to secure space for operation and inspection at the front of the container, and the rear of the container can be installed close to the wall of an electrical room, etc., reducing the installation area.Moreover, it is possible to connect and disconnect cables. Since it can be done from the front, the workability is improved.

Furthermore, since the busbar bushing, disconnector, circuit breaker, and cable bushing that make up the main circuit are arranged in order from the top or the bottom, the cable can be drawn in from the bottom or the top. The direction in which the cable is drawn can be changed simply by changing the direction, and the cable can be easily pulled in either the upper or lower direction, and is easy to manufacture.

[Brief explanation of the drawing]

FIG. 1: Example 1 of a gas-insulated switchgear according to the present invention
FIG.

FIG. 2 is a side view showing Example 2 of the present invention.

FIG. 3 is a side view of a conventional example.

FIG. 4 is a cutaway side view of another conventional example.

[Explanation of symbols]

23　Airtight container 24 Front plate 25 Bus bar bushing 26 Bus line 27 Disconnector 30　Breaker 32 Cable bushing 35 Cable

Claims (1)

[Claims] Claim 1: A busbar bushing to which a busbar is connected from the outside, a disconnector, a circuit breaker, and a cable bushing to which a cable is connected from the outside, in order from top or bottom to the front plate of a closed container filled with insulating gas. gas-insulated switchgear, characterized in that a main circuit is formed by connecting the terminals of the busbar bushing, the disconnector, the circuit breaker, and the cable bushing in the container in an airtight manner. .