JPH09191512A - Gas insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a total unit of GIS(gas insulated switchgear) by rationalizing arrangement of equipment in a breaker tank. SOLUTION: An axial direction of a breaker tank 1 is vertically arranged, in an upper part of the tank, an arc-extinguishing chamber of a breaker CB is arranged in a direction orthogonal to the axial direction of the tank, and in its lower part, a line side disconnecting switch DS-L and a line side earth switch ES-L are arranged so that an operating direction of a movable contact of these switches is in parallel to the axial direction of the tank. A lightning arrester LA is arranged in these side surfaces. In this way, a structure of the tank is simplified, also an arrester tank necessary in the past can be omitted, so that a GIS can be formed in small size.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a power plant, a substation,
The present invention relates to a gas-insulated switchgear for electric power used in switchgears, power receiving stations, and the like (hereinafter, the gas-insulated switchgear is referred to as "GIS").

[0002]

2. Description of the Related Art Recently, as a streamlined arrangement of internal equipment of a GIS, there has been proposed one in which a circuit breaker is horizontally arranged in a tank. The present inventor has proposed a GIS that further rationalizes this (Japanese Patent Application No. 7-279259).
This will be described with reference to FIGS. 2 and 3.

FIG. 3 is a diagram showing the internal structure of the GIS. In the figure, 1 is a circuit breaker tank, 2 is a bus bar tank, 3 is a lightning arrester tank, and 4 is a cable terminal tank. 7 is a front operation box. Explaining the equipment arrangement inside the circuit breaker tank 1, the arc-extinguishing chamber portion of the circuit breaker CB is arranged in a direction orthogonal to the axial direction of the tank 1. In the space below the circuit breaker CB, the line-side disconnecting switch DS-L and the line-side grounding switch ES-L are arranged such that the moving directions of their movable contacts are parallel to the axial direction of the circuit breaker tank 1. It This makes it possible to dispose the line-side disconnector DS-L, the line-side grounding switch ES-L, and the operating mechanism 9 thereof close to the breaker CB.

Since it is not necessary to provide the operation mechanism 9 in the front operation box 7, the structure of the circuit breaker tank 1 can be simplified, and the space in the front operation box 7 can be increased in flexibility. . Further, since the distance from the circuit breaker CB to the line-side disconnecting switch DS-L and the line-side grounding switch ES-L is shortened, the lengths of the conductors 11 and 12 connecting them can be shortened. As a result, the electromagnetic force acting between the phases of the conductors 11 and 12 is reduced when a current is applied for a short time.
It is not necessary to particularly increase the mechanical strength of 1 and 12.

The respective devices of the GIS shown in FIG. 3 are connected as shown in the single line connection diagram of FIG. It should be noted that although reference numerals not mentioned in the above description are attached to FIG. 2 and FIG. 3, please refer to the description in [Embodiment of the Invention] below for these.

[0006]

In the GIS proposed by the present inventor, the tank is downsized by simplifying the structure of the circuit breaker tank 1 by simplifying the structure of the circuit breaker tank 1 and downsizing the entire GIS. Can be converted.
However, as a whole GIS, the circuit breaker tank 1,
Since the lightning arrester tank 3 and the cable terminal tank 4 are connected in series in the same direction, the problem that the length of the GIS unit is long remains.

An object of the present invention is to miniaturize the GIS as a whole by rationalizing the arrangement of lightning arresters in the GIS.

[0008]

The lightning arrester used in the recent GIS is not the one with a gap as in the past,
A gapless type using zinc oxide (ZnO) is normally applied. This type of arrester does not generate an arc during operation and is extremely reliable.

As described above, Japanese Patent Laid-Open No. 7-279259 proposed by the present inventor rationalizes the arrangement of the internal equipment of the circuit breaker tank in the GIS. The present invention utilizes the resulting space in the circuit breaker tank to house multiple arresters in the circuit breaker tank, thereby omitting the dedicated arrester tank. That is, the present invention is a gas-insulated switchgear having one tank in which a circuit breaker, a line-side disconnector, and a line-side grounding switch are arranged inside, and the axial direction of the tank is arranged vertically and the upper part of the tank is provided. , The arc-extinguishing chamber of the circuit breaker is arranged in a direction orthogonal to the axial direction of the tank. Then, a line-side disconnector and a line-side grounding switch are arranged below the tank so that the moving directions of these movable contacts are parallel to the axial direction of the tank. Further, a lightning arrester is arranged on the side surfaces of the line-side disconnector and the line-side grounding switch so that its axial direction is parallel to the axial direction of the tank.

As a result, the arrangement of the internal equipment of the circuit breaker tank is rationalized, and the lightning arrester tank, which has been conventionally required, is not required. As a result, the unit length of the GIS is shortened, and the GIS can be made smaller and lighter and the cost can be reduced.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing the internal structure of the GIS, and FIG. 2 is a single line connection diagram showing the internal connection of the GIS. In FIG. 1, 1 is a circuit breaker tank. The configuration of the circuit breaker tank 1 will be described later. Reference numeral 2 denotes a busbar tank, which houses a busbar BUS and a busbar-side disconnector DS-B, and is connected to a branch portion 17 of the circuit breaker tank 1. Four
Is a cable terminal tank, which houses the cable terminal portion CHd and is connected to the branch portion 16 of the circuit breaker tank 1. Reference numeral 6 denotes a support base for the cable terminal tank 4, which houses the current transformer CT therein. Further, 7 is a front operation box, which is an earthing switch ES
-1, The operation mechanism 10 of ES-2, the operation mechanism 8 of the circuit breaker CB, and the operation device main body 20 are accommodated.

With reference to FIG. 2, the connection relationship between the respective devices inside the GIS will be described. The busbar BUS in the busbar tank 2 is connected to the busbar side terminal of the circuit breaker CB in the circuit breaker tank 1 through the busbar side disconnector DS-B. Circuit breaker C
The line side terminal of B is connected to the cable terminal portion CHd in the cable terminal tank 4 via the line side disconnector DS-L. Cable 14 connected to cable end CHd
Are guided to the outside through the current transformer CT.

Grounding switches ES-1 and ES-2 are connected to the busbar side and the line side of the circuit breaker CB, respectively, and the line side grounding switch ES-L and the lightning arrester LA are connected to the line side of the line side disconnector DS-L. Are connected. Next, the configuration of the circuit breaker tank 1 and the arrangement of internal devices will be described in detail. Circuit breaker tank 1
Are arranged so that their axial directions are vertical. The circuit breaker tank 1 is connected to the bus bar side via an insulating spacer at the branch portion 17 formed on the upper portion. Further, the branch portion 16 formed in the lower portion is connected to the line side through an insulating spacer.

Further, a branch portion 18 for connecting to the circuit breaker operating mechanism 8 is provided on the opposite side of the branch portions 16 and 17. In the branch portion 18, the arc-extinguishing chamber portion of the circuit breaker CB is
The axial direction of the circuit breaker tank 1 is orthogonal to the axial direction of the circuit breaker tank 1, and the circuit breaker tank 1 is arranged. The operation mechanism 8 of the circuit breaker CB is housed in the front operation box 7. Circuit breaker CB
Ground switchgear ES-1, ES on the busbar side and the line side, respectively
-2 is connected. These two ground switches are circuit breakers C
The operation mechanism 10 is disposed in the upper space of B and is housed in the front operation box 7.

The line-side disconnecting switch DS-L and the line-side grounding switch ES-L are arranged in the space below the circuit breaker CB. Also,
The line-side disconnecting switch DS-L and the line-side grounding switch ES-L are arranged such that the moving direction of their movable contacts is parallel to the axial direction of the circuit breaker tank 1. Track-side disconnector DS-
An operating mechanism 9 for operating the movable contacts of L and the line side grounding switch ES-L is arranged in the circuit breaker tank 1.

Further, a lightning arrester LA is arranged on the side surfaces of the line side disconnecting switch DS-L and the line side grounding switch ES-L so as to be parallel to the axial direction of the circuit breaker tank 1. Lightning arrester L
A is connected to the line-side conductor 12 of the line-side disconnector DS-L. As the lightning arrester LA, a gapless type using zinc oxide (ZnO) is used. This lightning arrester LA
Does not generate an arc during operation, and does not affect other devices such as the circuit breaker CB even when stored in the circuit breaker tank 1.

As the lightning arrester LA, zinc oxide (Zn oxide)
It is not limited to the gapless type using O). As a lightning arrester, if it does not affect other equipment during operation, or if the effect is negligible,
Other types of arresters can be used. According to the embodiment described above, Japanese Patent Application No. 7-
The effect of the GIS of No. 279259, that is, by streamlining the equipment arrangement in the circuit breaker tank of the GIS described in the section [Prior Art] above, the circuit breaker tank is downsized and its structure is simplified. The effect of doing can be obtained. In addition to this, it is possible to obtain the effect that the GIS can be downsized by omitting the lightning arrester tank that has been conventionally required. Specifically, the length of the GIS unit shown in FIG. 1 can be shortened to about 60 to 75% as compared with the one shown in FIG.

[0018]

According to the present invention, by rationalizing the arrangement of equipment in the circuit breaker tank and further rationalizing the arrangement of the arrester, the tank can be downsized and its structure can be simplified.
The entire IS can be downsized.

[Brief description of the drawings]

FIG. 1 is a diagram showing the structure of one embodiment of a GIS of the present invention.

FIG. 2 is a single line connection diagram of GIS in the present invention and a conventional example.

FIG. 3 is a diagram showing a structure of a conventional GIS.

[Explanation of symbols]

 1 ... Circuit breaker tank 2 ... Bus bar tank 3 ... Lightning arrester tank 4 ... Cable terminal tank 7 ... Front operation box 8 ... Circuit breaker operation mechanism 9 ... Track side disconnector and grounding switch operation mechanism 10 ... Grounding switch operation Mechanisms 11, 12, 13 ... Conductors 16, 17, 18 ... Branching unit 20 ... Circuit breaker operating device main body CB ... Circuit breaker BUS ... Busbar DS-B ... Busbar side disconnector DS-L ... Lineside disconnector ES-1, ES-2 ... Grounding switch ES-L ... Line side grounding switch CHd ... Cable end CT ... Current transformer

Claims (1)

[Claims] 1. A gas-insulated switchgear having one tank in which a circuit breaker, a line-side disconnector and a line-side grounding switch are arranged, wherein the axial direction of the tank is arranged vertically and the upper part of the tank is provided. In the arc-extinguishing chamber portion of the circuit breaker,
The line side disconnecting switch and the line side grounding switch are arranged in a direction orthogonal to the axial direction of the tank, and the moving direction of the movable contacts and the axial direction of the tank are parallel to each other. Further, the lightning arrester is arranged on the inner side surface of the same tank of the line-side disconnecting switch and the line-side grounding switch so that its axial direction is parallel to the axial direction of the tank. Characteristic gas-insulated switchgear.