JPH01231231A - Patshua type gas circuit breaker - Google Patents

Abstract

PURPOSE:To extend an arc sufficiently and improve breaking performance by constituting the nozzle part of a movable contactor side with an insulation and providing a metal arc generation electrode at the downstream side thereof. CONSTITUTION:There are provided a movable side insulation nozzle 4 at the gas flow passage downstream of the bore part of a movable contactor 2 and an arc generation electrode 16 having the same potential as the movable contactor 2 at the end expansion part of the movable side insulation nozzle 4, respectively. During a cutoff process, an arc 30 does not occur on a movable side insulation nozzle 15, but is extended to a downstream side due to a gas flow 24, thereby generating an arc on the arc generation electrode 16. Also, a well part 15a and a convex part 15b are formed at the downstream side of the movable side insulation nozzle 15, thereby controlling the gas flow 24 and increasing gas density at the tip of the arc generation electrode 16. According to the aforesaid construction, the arc can be well extended, thereby enabling cooling via efficient gas absorption and enhancing breaking performance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a puffer-type gas circuit breaker, and particularly to a circuit breaker structure that improves circuit breaker performance.

[Conventional technology]

FIG. 3 shows a conventional puffer type gas breaker in the middle of being shut off. Movable contact 2 for puffer cylinder 1
．． Insulation cover 3. An insulated nozzle 4° nozzle holder 5 is attached. A shaft 6 is formed in the center of the puffer cylinder 1, and a space 8 surrounded by a fixed piston 7 is a puffer chamber. The shaft 6 is connected to an operating device (not shown) to the right in the drawing. 9 is a fixed contact. The closing operation is performed when the shaft 6 is driven to the left in the figure by an operating device (not shown), and the puffer cylinder 1. Nozzle holder 5.
Insulated nozzle 4. Insulation cover 3. The movable contacts 2 move together to the left in the figure, i'+7! The AJ contact 2 and the fixed contact 9 come into contact and are inserted to a predetermined dimension and then stopped. Therefore, the volume of the puffer chamber 8 is increased compared to the state shown in FIG.

In the shutoff operation, contrary to the closing operation, the shaft 6 is driven to the right in the drawing to separate the movable contact 2 and the fixed contact 3, and at the same time compresses the puffer chamber 8 to supply high-pressure gas with excellent arc extinguishing ability. flows in both directions, as shown by arrows 20, 21° 22, toward the fixed contact f9 side, and as shown by arrows 20, 23, and 24, toward the movable contact 1-2 side, and blows against the arc 30 to extinguish it. Then, the shutdown is completed.

Here, 10 is a nozzle on the movable contact side, and the movable contact 2
The gas density at the inner diameter portion 2a of the tip is increased to increase the withstand voltage.

Furthermore, by controlling the gas flow 22, the concave portion 4a and convex portion 4b of the insulating nozzle 4 increase the gas density at the tip 9a of the fixed contact 9, thereby increasing the withstand voltage (Japanese Patent Laid-Open No. 60-47315
issue).

The conventional interrupting section shown in FIG. 3 lacks the withstand voltage for extremely severe duties such as the transient recovery voltage when interrupting a large current of 550 KV at 9 J. In order to improve the interrupting performance, the arc voltage is increased by extending the arc for 1 minute and blowing a gas with high arc extinguishing ability, and after the arc is extinguished, the fixed contact 9 and It is important to increase the insulation recovery between the two. However, since the mover side nozzle 10 is made of metal, the arc 30
0. It rarely extends downstream. Therefore,
There were also limits to the blocking performance.

(Problems to be Solved by the Invention) The above-mentioned prior art does not take into consideration the arc extension and gas flow on the movable contact side, and therefore poses a problem in terms of improving the g-cutting performance.

An object of the present invention is to sufficiently extend the arc and improve the gas flow on the movable contact side, thereby improving the breaking performance.

[Means to solve the problem]

The L2 objective is achieved by constructing the nozzle part on the movable contact side with an insulator and providing an arc invitation electrode made of metal on the downstream side thereof.

[Effect]

In other words, when the current is near zero, the arc is ignited in a long range between the fixed contact and the arc-inducing electrode, and the arc-inducing gas is effectively sprayed against the arc by the insulating nozzle on the movable element side. Can be done.

〔Example〕

FIG. 1 shows a shut-off state of a puffer type gas circuit breaker which is an embodiment of the present invention. 15 is n (video insulation nozzle, 1
Reference numeral 6 is an arc invitation electrode made of an arc-resistant metal. 17 is a gas vent.

Figure 2 shows the interruption in progress. Since the arc 30 does not touch the movable insulating nozzle 15, it is extended downstream by the gas flow 24 and ignites the arc inviting electrode 16.

The downstream side of the movable insulating nozzle 15 has a concave portion 15.1 and a convex portion 1.
5b is formed and controls the gas flow 25 to
Increasing the gas density at the tip of the tube improves the withstand voltage.

According to this embodiment, it is possible to extend the arc longer than before and to increase the gas density at the tip of the arc-inducing electrode provided on the movable element side.

In Fig. 2, the shape of the downstream side of the movable element side insulating nozzle is as follows:
The same effect can be obtained with a straight, wide-end shape.

〔Effect of the invention〕

According to the present invention, since the arc can be sufficiently extended and cooled by effective gas spraying, it is possible to provide a interrupting section with excellent interrupting performance.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the closing state of the shut-off part of a puffer type gas circuit breaker according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of the shut-off part without showing the middle of shutoff, and Fig. 3 is a cross-sectional view of the shut-off part of a puffer type gas circuit breaker according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of the interrupting part of the type gas circuit breaker in the middle of interrupting. 1... Puffer cylinder, 2... Movable contact, 4...
, insulating nozzle, 7... fixed bismine, 8... puffer chamber, 9... fixed contact, 15... movable side insulating nozzle, 16... arc inviting electrode. Letter of dispute over drawings (no change in content) Engraving of drawings (no change in content) Method for writing procedural amendments) % formula % Name of invention Relationship with person who makes amendments to puffer type gas circuit breakers/11'1 Patent applicant and i H, t5101 Hitachi Co., Ltd.
Osamu Tokoshiro Hitori, + lsu; + 〒Same〒] Marunouchi, Chiyoda-ku, Tokyo-
Chome 5-1 Miyama 1T ＾・1 Contents of house drawing correction

Claims (1)

[Claims] 1. During operation of the circuit breaker, at least one pair of bondable fixed contacts and a movable contact; a pressure generating section consisting of a cylinder and a piston that compress arc-extinguishing gas along with the breaking operation; In a puffer-type gas circuit breaker equipped with an insulating nozzle that sprays an interpolar arc generated when the fixed contact, the movable contact, and the movable contact open, a gas flow path downstream of the inner diameter of the movable contact is provided. 1. A puffer-type gas circuit breaker, characterized in that a movable-side insulating nozzle and an unwidened portion of the movable-side insulating nozzle are provided with arc-inducing electrodes having the same potential as the movable contact.