JPH05111117A - Gas insulation switching device - Google Patents

Abstract

PURPOSE:To prevent hot gas generated by a breaker from directly striking against a current transformer and badly influencing it, in a gas insulation switching device which has the breaker housed in an insulation gas-filled tank and the current transformer located above the breaker. CONSTITUTION:A primary circuit conductor located above a breaker 2 in a cutoff tank 14 is extended to form an isolated section 23 which is parallelly isolated from the breaker 2 and is parallel with the center of an axis of the breaker 2. A current transformer 3 is installed in the isolated section 23.

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 installed in a power plant, a substation or the like.

[0002]

2. Description of the Related Art A conventional gas-insulated switchgear will be described with reference to FIG. As shown in the figure, on the base 11, the circuit breaker unit 12a, the main busbar unit 12b, the line side unit 1
2c is formed. The circuit breaker unit 12a is the base 11
The upper frame 13 and the shutoff tank 14 on the frame 13 and the like, and the line-side unit 12c includes the cable support stand 15 and the cable tank 16 on the base 11. The main busbar unit 12b has a conduit 17 extending in a direction perpendicular to the plane of the drawing.
a, 17b and pipelines 18a, 18 connected to the shutoff tank 14 at right angles to the pipelines 17a, 17b
b and the like. Main buses 1a and 1b for three phases are respectively arranged in the pipe lines 17a and 17b in a direction perpendicular to the plane of the drawing. Be led to. Main bus 1
There are two main buses a and 1b, one of which is a main line and the other is an auxiliary line used as an emergency in case of a power failure or the like. The circuit breaker 2 and the current transformer 3 are provided in the interruption tank 14, and the cable head 4 and the lightning arrester 5 for connecting the load busbar are provided in the cable tank 16. Reference numeral 6 is an instrument transformer connected to the lightning arrester 5.

[0003]

However, since the current transformer 3 is arranged directly above the circuit breaker 2, hot and high-pressure hot gas blown out from the circuit breaker 2 rises and damages the current transformer 3. There is a risk. In addition, maintenance and inspection of the circuit breaker 2 is performed by the upper lid 19
The current transformer 3 has to be removed when performing the above procedure, which increases the number of work steps and the power failure time. In order to perform maintenance and inspection of the circuit breaker 2 without removing the current transformer 3, it is necessary to provide a manhole 20 for inspection on the side surface of the tank 14, which increases the cost.

In addition, the hot gas may deteriorate the insulation performance between the current transformer 3 and the main circuit conductor 21 penetrating the current transformer 3. In order to maintain insulation, the distance between the circuit breaker 2 and the current transformer 3 must be increased, and if it is increased, the height of the blocking tank 14 will increase.

Therefore, an object of the present invention is to provide a gas-insulated switchgear which solves the above problems.

[0006]

The structure of the present invention for achieving the above object comprises a circuit breaker in a tank filled with an insulating gas, and a main circuit conductor led upward from the circuit breaker. In a gas-insulated switchgear equipped with a surrounding current transformer,
Characterized by extending the main circuit conductor from directly above the circuit breaker to a position distant in the horizontal direction, providing a distant portion, and providing a current transformer at the distant portion, or a horizontal portion in which the main circuit conductor extends in the horizontal direction. Is provided, and a current transformer is provided in the horizontal portion.

[0007]

[Function] When the current transformer is provided at a position horizontally separated from directly above the circuit breaker, the hot gas of the circuit breaker does not hit the current transformer and the current transformer is not affected by the hot gas. .. In addition, maintenance and inspection of the circuit breaker can be performed from above the circuit breaker.

On the other hand, when the axis of the current transformer is made horizontal, the hot gas of the circuit breaker does not directly enter between the current transformer and the main circuit conductor, so the current transformer and the main circuit conductor are There is little risk that the insulation performance between

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. Since the present embodiment is an improvement of a part of the conventional gas-insulated switchgear, the same parts as those in the prior art are designated by the same reference numerals, and the description thereof will be omitted. Only different parts will be described.

(A) Embodiment 1 Embodiment 1 of the gas insulated switchgear according to the present invention is shown in FIG.
Shown in (a) and (b). As shown in the figure, the upper end of the main circuit conductor 21 led out from the circuit breaker 2 has a support insulator 22.
The main circuit conductor 21 is fixed to the upper lid 19 via the above, and a separating portion 23 is extended and provided in a position separated from above the circuit breaker 2 in the main circuit conductor 21 in parallel therewith. Then, the current transformer 3 is provided in the separated portion 23. As shown in FIG. 1A, the circuit breaker 2 is provided for three phases at the apex of the isosceles triangle, so that the current transformer 3 is similarly provided for three phases.

In such a gas-insulated switchgear, the current transformer 3 is arranged at a position away from directly above the circuit breaker 2, so that even if the hot gas rises from the circuit breaker 2, the hot gas is transformed by the current transformer. Three
The current transformer 3 is not affected. In order to maintain and inspect the circuit breaker 2, by removing the upper lid 19, the support insulator 22, and the main circuit conductor 21, the insulating nozzle and the arcing contact in the circuit breaker 2 can be replaced from directly above without removing the current transformer 3. It can be carried out. Besides this, circuit breaker 2
Since it is possible to lift the whole of the
Circuit breaker unit 1
Circuit breaker 2 on site without taking the whole 2a back to the factory
Can be exchanged.

(B) Embodiment 2 FIG. 2 shows Embodiment 2 of the gas-insulated switchgear according to the present invention.
Shown in (a) and (b). In this embodiment, the main circuit conductor 21 is temporarily separated from above the circuit breaker 2 and then horizontally guided to form a horizontal portion 24 as shown in the figure. A vessel 3 is provided. Figure 2 (b)
Since three phases are required as shown in FIG. 5, the horizontal portion 24 of the main circuit conductor is provided at the apex of the isosceles triangle as viewed in the horizontal direction.

With such a structure, the axis of the current transformer 3 becomes horizontal, and the space formed by the current transformer 3 and the horizontal portion 24 extends in the horizontal direction instead of the vertical direction. Therefore, the hot gas rising vertically upward from the circuit breaker 2 is not guided into the current transformer 3. Therefore horizontal part 2
It is less likely that the insulation performance between the current transformer 4 and the current transformer 3 will deteriorate.

[0014]

As can be seen from the above description, according to the gas-insulated switchgear according to the present invention, the current transformer is moved to a position horizontally separated from directly above the circuit breaker, so that the heat generated from the circuit breaker is generated. Reliability is improved without being affected by gas. Also,
You can perform maintenance and inspection of the circuit breaker directly above the circuit breaker, and you can lift the circuit breaker and take it out of the tank, so you can replace the circuit breaker on site without having to take the entire circuit breaker unit back to the factory. Further, unlike the conventional case, it is not necessary to form a manhole for maintenance and inspection of the circuit breaker on the side surface of the tank, which leads to cost reduction.

On the other hand, in the gas insulated switchgear in which the axis of the current transformer is horizontal, the hot gas rising from the circuit breaker does not directly enter between the current transformer and the horizontal portion of the main circuit conductor. Therefore, the insulation performance between the current transformer and the main circuit conductor is stable. Further, the stable insulation performance makes it possible to reduce the distance between the current transformer and the main circuit conductor, and it becomes possible to install many small and efficient current transformers.

[Brief description of drawings]

1 relates to a first embodiment of a gas insulated switchgear according to the present invention, FIG. 1 (a) is a view taken along the line AA of FIG. 1 (b),
(B) is sectional drawing of the principal part.

2 relates to a second embodiment of the gas insulated switchgear according to the present invention, FIG. 2 (a) is a view taken in the direction of arrows BB in FIG. 2 (b), and FIG.
(B) is sectional drawing of the principal part.

FIG. 3 is a block diagram of a conventional gas-insulated switchgear.

[Explanation of symbols]

2 ... Circuit breaker, 3 ... Current transformer, 14 ... Breaking tank, 21 ... Main circuit conductor, 23 ... Separation part, 24 ... Horizontal part.

Claims (2)

[Claims] 1. A gas-insulated switchgear comprising a circuit breaker in a tank filled with insulating gas, and a current transformer surrounding the main circuit conductor drawn upward from the circuit breaker. A gas-insulated switchgear, characterized in that a distant portion is provided by extending from a position directly above the breaker to a position distant in the horizontal direction, and a current transformer is provided at the distant portion. 2. A gas-insulated switchgear comprising a circuit breaker in a tank filled with insulating gas and a current transformer surrounding the main circuit conductor led upward from the circuit breaker, wherein the main circuit conductor is A gas-insulated switchgear characterized in that a horizontal portion extending in the horizontal direction is provided, and a current transformer is provided at the horizontal portion.