JPH09130931A - Gas insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas insulated switchgear in which the length of bus can be shortened on the side of transmission line. SOLUTION: In a gas insulated switchgear installed in a power generating/ transforming station where a voltage transformer 3 is fixed only for one phase of branch bus on the side of transmission line for the gas insulated switchgear, a three-phase gas insulated bus 4 is employed for the branch bus on the line side. Since the voltage transformer 3 is fixed while being led out substantially vertically from the three-phase gas insulated bus 4, the length of bus can be shortened on the line side. Consequently, an approach can be ensured for wrecker and the maneuverability is enhanced at the time of accident.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a gas-insulated switchgear.

[0002]

2. Description of the Related Art In recent years, a gas-insulated switchgear (hereinafter referred to as GIS) has been widely adopted as a switchgear installed in a power substation. A conventional example of such a GIS will be described with reference to FIG.

In the figure, a main bus 1 on the line side of a transmission line and a three-phase gas insulation bus 4 of a gas insulated switchgear are connected from a circuit breaker 2 via a single-phase branch bus 7. The three-phase gas-insulated bus bar 4 is connected to the outside via a bushing 5 and a lightning arrester 6. An instrument transformer (hereinafter referred to as PT) 3 for pressure detection is attached to the line side of the power transmission line. This PT3 is usually attached to only one phase, so it is attached to the single-phase branch bus bar 7 on the line side.

[0004]

By the way, in the GIS configuration as described above, the other two-phase branch busbars 7 to which the PT3 is not attached are merely connecting busbars, and the overall busbar length is long. However, because of this, it was difficult for the tow truck to approach, and the response in an accident was not very good. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gas-insulated switchgear capable of shortening the bus length on the line side of a power transmission line.

[0005]

In order to achieve the above object, the first aspect of the present invention is that only one phase of a branch bus on the line side of a transmission line of a gas insulated switchgear installed in a power substation is provided. In the gas-insulated switchgear in which the transformer for instrument is attached to, the branch bus bar on the side of the line is a three-phase gas-insulated bus bar, and the transformer for instrument is pulled out from the three-phase gas-insulated bus bar approximately vertically and attached. Characterize.

According to a second aspect of the present invention, in the gas-insulated switchgear according to the first aspect, the instrument transformer is attached to an end of the three-phase gas-insulated busbar. A third aspect of the present invention is characterized in that, in the gas-insulated switchgear according to the first aspect, the instrument transformer is pulled out and attached substantially vertically from the single-phase gas-insulated busbar.

According to a fourth aspect of the present invention, in the gas-insulated switchgear according to the first aspect, the instrument transformer is attached to an upper portion of a three-phase gas-insulated bus bar. According to a fifth aspect of the present invention, in the gas-insulated switchgear according to the first aspect, the instrument transformer is attached to an upper portion of a lead-out portion of a circuit breaker.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention.
It is a top view of (correspondence). As shown in the figure, the difference between this embodiment and the conventional example of FIG. 12 which has already been described is that the PT 3 is attached to the three-phase gas-insulated bus bar 4 connecting the circuit breaker 2 and the bushing 5 substantially vertically. Since these points are the same and the other points are the same, the same reference numerals are given to the same portions, and duplicate description will be omitted.

In this embodiment, the PT3 is connected to the three-phase gas-insulated bus bar 4
The single-phase branch busbar is not required and the busbar length on the line side is shortened as compared with the conventional example, because the busbar is installed almost vertically. Further, this makes it easier for the tow truck to come close to the vehicle, which improves accident response.

FIG. 2 is a plan view of a second embodiment (corresponding to claim 2) of the present invention. As shown in the figure, the present embodiment is different from the first embodiment in that it is provided at the end of the three-phase gas-insulated bus bar 4 connecting the PT3 to the circuit breaker 2, and the other points are the same. Therefore, the same reference numerals are given to the same portions, and duplicate description will be omitted.

FIG. 3 is a plan view of a third embodiment (corresponding to claim 2) of the present invention. As shown in the figure, the present embodiment is different from the first embodiment in that the PT 3 is provided at the end of the three-phase gas-insulated bus bar 4 connecting to the arrester 6, and other points are the same. Therefore, the same portions will be denoted by the same reference symbols and redundant description will be omitted.

FIG. 4 is a plan view of a fourth embodiment (corresponding to claim 3) of the present invention. As shown in the figure, the difference between this embodiment and the first embodiment is that the PT3 is attached by pulling it out vertically from the single-phase bus connecting the circuit breaker 2 to the three-phase gas-insulated bus 4. Since the other points are the same, the same portions are denoted by the same reference numerals and the duplicate description will be omitted.

FIG. 5 is a plan view of a fifth embodiment (corresponding to claim 4) of the present invention, and FIG. 6 is a side view of FIG. As shown in the figure, the difference between this embodiment and the first embodiment is that PT
3 from 3 phase gas insulated busbar 4 to bushing 5 3
Since the points are attached to the upper part of the phase bus and the other points are the same, the same portions are denoted by the same reference numerals and the duplicate description will be omitted.

FIG. 7 is a plan view of a sixth embodiment of the present invention (corresponding to claim 4), and FIG. 8 is a side view of FIG. As shown in the figure, the difference between this embodiment and the first embodiment is that PT
3 is attached to the upper part of the three-phase gas bus bar 4 connecting the circuit breaker 2 to the three-phase gas insulation bus bar 4, and the other points are the same, and therefore, the same parts are denoted by the same reference numerals and will not be described repeatedly. Is omitted.

FIG. 9 is a plan view of a seventh embodiment of the present invention (corresponding to claim 5), and FIG. 10 is a side view of FIG. As shown in the figure, the difference between this embodiment and the first embodiment is that P
The point T3 is attached to the upper part of the lead-out portion of the circuit breaker, and the other points are the same. Therefore, the same portions are denoted by the same reference numerals and the duplicate description thereof will be omitted.

FIG. 11 is a plan view of an eighth embodiment (corresponding to claim 4) of the present invention. As shown in the figure, the difference between this embodiment and the first embodiment is that PT3 is pulled out vertically from the three-phase gas-insulated bus bar 4, and the other points are the same, so Are denoted by the same reference numerals, and duplicate description will be omitted.

According to the second to eighth embodiments of the present invention described above, the busbar length on the track side can be shortened in comparison with the conventional example, so that the space becomes compact and a tow truck can enter in the event of an accident. You get space. Therefore, the response at the time of the accident was much better than the conventional example.

[0018]

As described above, according to the gas insulated switchgear of the present invention, the single-phase branch busbar on the line side is a three-phase gas insulated busbar, PT is a three-phase gas insulated busbar between the breaker and the bushing, Alternatively, since it is attached to the single-phase bus bar, the bus line length on the track side can be shortened, and thus a space for a tow truck can be secured, and an accident response can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a first embodiment of the present invention.

FIG. 2 is a plan view of a second embodiment of the present invention.

FIG. 3 is a plan view of a third embodiment of the present invention.

FIG. 4 is a plan view of a fourth embodiment of the present invention.

FIG. 5 is a plan view of a fifth embodiment of the present invention.

6 is a side view of FIG.

FIG. 7 is a plan view of a sixth embodiment of the present invention.

FIG. 8 is a side view of FIG. 7;

FIG. 9 is a plan view of a seventh embodiment of the present invention.

FIG. 10 is a side view of FIG. 9;

FIG. 11 is a plan view of an eighth embodiment of the present invention.

FIG. 12 is a plan view of a conventional GIS.

[Explanation of symbols]

1 ... Main bus bar, 2 ... Circuit breaker, 3 ... Transformer for transformer (PT),
4 ... 3-phase gas insulated bus bar, 5 ... Bushing, 6 ... Lightning arrester,
7 ... Single-phase branch busbar.

Claims (5)

[Claims] 1. A gas insulated switchgear in which an instrument transformer is attached to only one phase of a branch busbar on the line side of a transmission line of a gas insulated switchgear installed in a power substation, wherein the branch busbar on the line side is provided. Is a three-phase gas-insulated busbar, and the instrument transformer is pulled out approximately vertically from the three-phase gas-insulated busbar,
A gas-insulated switchgear characterized by being installed. 2. The gas insulated switchgear according to claim 1, wherein the instrument transformer is attached to an end of the three-phase gas insulated busbar. 3. The gas-insulated switchgear according to claim 1, wherein the instrument transformer is pulled out from a single-phase gas-insulated busbar substantially vertically and attached. 4. The gas insulated switchgear according to claim 1, wherein the instrument transformer is attached to an upper portion of a three-phase gas insulated busbar. 5. The gas insulated switchgear according to claim 1, wherein the instrument transformer is attached to an upper portion of a lead-out portion of a circuit breaker.