JP2564281B2 - Three-phase batch gas circuit breaker - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a three-phase batch gas circuit breaker, and more particularly to miniaturization of a gas circuit breaker without causing deterioration in insulation performance between phases and ground. The present invention relates to a hot gas exhaust device when the current is cut off.

[Conventional technology]

Fig. 4 shows the tank 1 of the conventional three-phase batch gas circuit breaker
The internal structure of is shown. Electrically isolated three-phase breaker 2,
3 and 4 are stored. (See, for example, Japanese Patent Publication No. 57-18291). FIG. 5 is a top view of FIG.
They are arranged in a regular triangle.

FIG. 3 shows a vertical cross-sectional view of one phase of the blocking portion. Fixed contact tail
5, a normal buffer-type cutoff portion including a movable contact 6, an insulating nozzle 7 and a buffer ring 8 is housed in an insulating cylinder 9, which is supported by a movable conductor 11 and an insulating support 13. .

The flow of the hot gas generated at the time of shutting off in the shutoff unit will be described with reference to FIG. The SF ₆ gas released from the buffer chamber inside the buffer cylinder 8 has a high temperature and low density when shut off, and flows into the fixed contactor 5 and the movable contactor 6 into the rod of the buffer cylinder 8. .

[Problems to be solved by the invention]

The above-mentioned conventional technology has high temperature and low density when the current is cut off to the movable side.
No consideration was given to the deterioration of insulation performance between phases and ground due to SF ₆ gas exhaust.When reducing the size of a three-phase batch type gas circuit breaker, whether the insulation performance deteriorates due to exhaust of hot gas to the movable side. It was necessary to consider.

An object of the present invention is to optimally determine the direction of the exhaust port provided in the movable conductor when exhausting the hot gas to the movable side so that the insulation performance due to the interphase and ground-to-ground hot gas does not deteriorate. The purpose is to reduce the size of the gas circuit breaker.

[Means for solving problems]

The above-mentioned object is to store in one tank grounded, a stationary contact, a movable contact, an insulating nozzle, a piston, and a shut-off unit including a pressure generating unit that is equipped with a pressure generating unit for each of three phases, In a three-phase collective gas circuit breaker using SF ₆ gas as an arc extinguishing medium, each of the interrupting parts is arranged at each vertex position of a virtual triangle in the tank, and the pressure generating part is provided on the movable contact side. And a discharge port of the arc-extinguishing medium generated in the above, wherein the exhaust port is provided so as to be displaced in the axial direction of the tank, and the discharge direction of the exhaust port is a midpoint of each side of the virtual triangle. And the tank inner wall direction is orthogonal to each side.

[Action]

The release of high temperature and low density SF ₆ gas that occurs when the
Although the insulation performance in the space is deteriorated, the discharge direction has a great influence on the interphase and ground insulation performance of the three-phase block type gas circuit breaker.

Between the above phases, when the hot gas blown out from the two phases faces the direction of the straight line connecting the two phases, the insulation performance of SF ₆ gas decreases significantly, and as the distance increases However, it does not easily deteriorate. On the other hand, between the ground and a grounded metal container, here, when high-temperature, low-density SF ₆ gas blows out in the direction of the shortest distance toward the inner wall of the gas tank, the insulation is the worst, and it deviates from the above direction. Therefore, the insulation performance is less deteriorated.

By considering both the above-mentioned phase-to-ground and ground-to-ground at the same time, the optimum exhaust port position with the smallest insulation performance deterioration in the SF ₆ gas exhaust space is determined, and three-phase It is possible to reduce the size of the batch type gas circuit breaker.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to FIGS. 1 and 2. The high-temperature, low-density SF ₆ gas generated when the current is cut off at the cut-off portion in FIG. 3 flows through the conductor 14 and is discharged to the upper part of the ground tank 1, and the SF ₆ gas inside the buffer cylinder 8 is discharged. It flows in the direction opposite to the spraying direction and is discharged from the exhaust port 12 provided in the movable conductor 11 (16).

In a three-phase package type gas circuit breaker in which the interruption part supported by the insulation cylinder 9 and the insulation support 13 is arranged in an equilateral triangle in the grounded metal container 1 and connected by the conductor 15. , The position of the exhaust port 12 on the movable side is shifted upward and downward as shown in FIG. Further, as shown in Fig. 2, in consideration of suppressing deterioration of insulation performance between phases and ground, the exhaust port is directed toward the apex of the equilateral triangle where the center of each phase is the midpoint of each side of the triangle. Twelve placed. That is, the exhaust direction of the exhaust port 12 is arranged so as to be toward the inner wall of the tank at the midpoint of each side of the triangle and in the direction orthogonal to each side. 14 is a fixed side conductor.

〔The invention's effect〕

According to the present invention, since the exhaust port is provided so as to be displaced in the axial direction of the tank, it is difficult for hot gases to mix with each other,
Since the discharge direction of the exhaust port is the middle point of each side of the triangle and the direction of the inner wall of the tank orthogonal to each side, the distance to the tank can be maximized. As a result, the space inside the grounded tank can be effectively used to minimize the deterioration of insulation performance due to the hot gas released at the time of interruption, providing a compact ultra-high pressure, large capacity three-phase batch type gas circuit breaker. can do.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a three-phase batch type gas circuit breaker showing an embodiment of the present invention, FIG. 2 is a lateral sectional view taken along the line II-II of FIG. 1, and FIG. Sectional views showing Fig. 4, Fig. 5 and Fig. 5
FIG. 4 is a structural view of a conventional three-phase batch type gas circuit breaker, FIG. 4 is a conventional vertical sectional view, and FIG. 5 is a conventional transverse sectional view. 1 ... Ground tank.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Sasaki 1-1-1 Kokubuncho, Hitachi City Inside the Kokubun Plant, Hitachi, Ltd. (56) References JP-A-58-75723 (JP, A) JP-A-SHO 58-194228 (JP, A)

Claims (1)

(57) [Claims] 1. A grounded tank accommodates three phases of shut-off parts each including a fixed contact, a movable contact, an insulating nozzle, a piston, and a cylinder, and a pressure generating part. In a three-phase batch gas circuit breaker using SF ₆ gas as an arc extinguishing medium, each of the breaking parts is arranged at each vertex position of a virtual triangle in the tank, and the pressure is generated on the movable contact side. A discharge port for the arc-extinguishing medium generated in the section, the exhaust port is provided so as to be displaced in the axial direction of the tank, and the discharge direction of the exhaust port is in each side of the virtual triangle. A three-phase batch gas circuit breaker characterized in that the tank inner wall direction is a point and is orthogonal to each side.