JPS6364228A - 3-phase batch gas breaker - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a three-phase bulk gas circuit breaker, and in particular, to miniaturization of the gas circuit breaker without deteriorating the insulation performance between phases and between the ground. The present invention relates to a suitable exhaust device for hot gas during current interruption.

[Conventional technology]

FIG. 4 shows the internal structure of the cut-off tank 1 of a conventional three-phase bulk gas circuit breaker.
3.4 is stored. (For example, Tokuko Sho 57-182
(Refer to Publication No. 91) FIG. 5 is a top view of FIG. 4, and the three-phase cut-off portions are arranged in an equilateral triangle shape.

FIG. 3 shows a vertical view of the interrupter-phase, fixed contact 5
．． Movable contact 6. A conventional buffer-type interrupter consisting of an insulating nozzle 7 and a buffer cylinder 8 is housed in an insulating tube 9, which is connected to a movable conductor 11 and an insulating support 13.
Supported by

The flow of hot gas generated at the above-mentioned shut-off section when shut-off will be explained using FIG. 3. The SFe gas released from the buffer chamber inside the buffer cylinder 8 has a high temperature and low density when shut off, and flows toward the fixed contact 5 and into the rod of the buffer cylinder 8 passing through the movable contact 6. occurs.

[Problem that the invention seeks to solve]

The above conventional technology uses high-temperature, low-density S when power is cut off to the movable side.
The reduction in insulation performance between phases and ground due to the exhaust of Fe gas is not taken into account. It was necessary to consider whether or not it existed.

An object of the present invention is to optimally determine the direction of the exhaust port provided on the movable side conductor when exhausting hot gas to the movable side, so as to avoid deterioration of insulation performance due to hot gas between phases and ground. The object of the present invention is to downsize a phase-to-finger type gas circuit breaker.

[Means for solving problems]

The above purpose is to reduce the high temperature and low density SFe generated during current interruption.
When exhausting gas to the movable side, this is achieved by providing an exhaust port on the movable side conductor in the farthest direction between the phases and the ground.

[Operation] The release of high-temperature, low-density SFe gas that occurs when shutting off is
This causes a decrease in insulation performance in that space, but depending on the direction in which it is emitted, it has a large effect on the interphase and ground insulation performance of a three-phase finger-shaped gas circuit breaker.

In the above-mentioned phase, when the direction of hot gas blowing out from the two phases faces the direction of the straight line connecting the two phases, the insulation performance of SFe gas decreases significantly, and as the distance from that direction increases, Hard to deteriorate. On the other hand, between the ground and the ground, the insulation is the worst when high-temperature, low-density SFe gas blows out in the shortest direction toward the inner wall of the grounded metal container, here the gas tank; The decrease in performance will be smaller.

By simultaneously considering both the above phase-to-phase and ground-to-ground characteristics, and determining the optimal position of the exhaust port with the least deterioration in insulation performance in the SFe gas exhaust space, three-phase It is possible to downsize the finger-shaped gas circuit breaker.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on FIGS. 1 and 2. The high-temperature, low-density SFe gas generated when the current is cut off at the cut-off part in FIG. It flows in the opposite direction to the blowing direction and is emitted from the exhaust port 12 provided on the movable conductor 11 (
16).

The cut-off part is an insulating cylinder 9. In a three-phase finger-shaped gas circuit breaker supported by an insulating support 13, the three phases are arranged in an equilateral triangle in a grounded metal container 1, and connected by a conductor 15. As shown in Figure 1, the position of each phase is shifted upward and downward, and as shown in Figure 2, the center of each phase is The exhaust port 12 is arranged in the direction of the vertex of the equilateral triangle, which is the midpoint of each side of the triangle.

14 is a fixed side conductor.

〔Effect of the invention〕

According to the present invention, the space inside the grounded tank can be effectively used to minimize the deterioration of insulation performance due to hot gas released at the time of shutoff. type gas circuit breakers can be provided.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of a three-phase finger-shaped gas circuit breaker showing an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along arrows -■ in Fig. 1, and Fig. 3 is a cross-sectional view of the current interrupting section. Longitudinal sectional views showing details, Figures 4 and 5
The figure shows a conventional three-phase finger-shaped gas circuit breaker, FIG. 4 is a longitudinal sectional view of the conventional one, and FIG. 5 is a conventional cross-sectional view. 1...Grounded tank.

Claims (1)

[Claims] 1. A blowing pressure generating unit consisting of individual fixed contacts, movable contacts, insulating nozzles, pistons, and cylinders for three phases is housed in one grounded tank, thereby interrupting current. In addition, in products that use SF_6 gas as an arc-extinguishing medium, the high-temperature, low-density SF_6 gas generated when the current is interrupted is vented in an optimal manner that does not cause a decline in the interrupting performance or insulation performance. A three-phase bulk gas circuit breaker characterized by having an exhaust port on the movable side conductor.