JPS61109231A - Contactor apparatus for gas breaker - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to the shape of a contact for a buffer type gas circuit breaker, and particularly to the shape of a movable arc contact that ensures a wipe distance.

[Background of the invention]

In the conventional device, as described in Japanese Patent Application Laid-Open No. 155979/1980, the movable arc contactor is divided into a plurality of equal parts, and a force is applied toward the center by a tension spring to contact the fixed arc contactor.

FIG. 3 shows the shut-off state of the conventional device. The current is fixed arc contact 1. Movable arc contactor 2° cylindrical conductor 3.
It flows through the buffer cylinder 4 to the other terminal. The movable arc contactor is divided into a plurality of equal parts as shown in FIG. 4, and tension springs 5a and 5b apply contact force to the fixed arc contactor 1 and the cylindrical conductor 3. buffer cylinder 4
A buffer chamber 10 is formed by the shaft 6 and a fixed piston (not shown). Insulating cover 7 is insulating nozzle 8
The insulating nozzle has a narrowest portion 9, forming a gas flow path with the inner wall surface of the insulating nozzle.

In the blocking operation, the shaft 6 is driven to the right in the figure by an operation mechanism (not shown). Cylindrical conductor 3° movable arc contact 2. The insulating cover 7 and the insulating nozzle 8 are also driven rightward at the same time, and the volume of the buffer chamber 10 is compressed. Since the entire shutoff group is housed in a container filled with gas (for example, SF, gas) with excellent arc-extinguishing performance, high-pressure gas can be obtained by compressing the buffer chamber.

FIG. 5 shows a state in the middle of separation. An arc 11 is generated between the fixed arc contact 1 and the movable arc contact 2 and is elongated, but the high pressure gas in the buffer chamber moves from arrow 12 to 13.
14 and cools the arc 11. As shown in FIG. 5, the buffer chamber is further compressed to become a high-pressure gas, and when the arc is stretched, the arc 11 is extinguished and the interruption is completed.

In FIG. 4, the solid line shows the closed state in the case of FIG. 3, and the two-dot chain line shows the cut-off state in the case of FIG. Here, if the opening speed is relatively slow, the shape shown by the two-dot chain line will occur almost immediately after the opening, but if the opening speed increases and the arc continues to open, the shape shown by the solid line will still be generated. occurs. In that case, the problem is that a gap d is created due to the slit of the movable arc contactor 2, so (1)
Problems include: (2) the tension spring 5a is burnt out by the arc; (2) the electric field becomes too strong, making it unsuitable for high-voltage circuit breakers; and (3) the wipe distance varies depending on the opening speed. (1) has been solved by Japanese Patent Application Laid-open No. 155979/1982, but (2).

(3) remains unresolved.

FIGS. 6 and 7 show (2) in more detail. In other words, Fig. 6 shows the wipe operation performed normally, and Fig. 7 shows the movable arc contact 2 due to the fast opening speed.
This is because of the delay in following up. In other words, the separation position is at the point where the curve starting part (2) of the fixed arc contact 1 and the curve starting part (2) of the movable arc contact 2 are exposed, and is shorter than the normal wipe distance.

If the wipe distance m is insufficient, the opening speed is slow, and
Since the electrode is opened before the buffer chamber pressure rises sufficiently, gas cannot be blown to the arc satisfactorily, resulting in a decrease in interrupting performance. Further, even in the case of advanced small current interruption duty, a high voltage is applied between the electrodes at a point in time when the distance between the electrodes is short, which again causes a problem in performance deterioration.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a buffer type gas circuit breaker that ensures a reliable wipe distance and eliminates the high electric field area caused by the slit of the contact device.

[Summary of the invention]

In the present invention, there is a limit to high-speed response in the contact force due to spring action, and it is theoretically impossible to solve the problem of wipe shortage. It has a structure in which the opening point where the child finally leaves is provided in different parts.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. Since the basic role is the same as in FIG. 3, the features of the present invention will be explained. The cylindrical conductor 3 is integrated with the arcing part 20 and has a plurality of (three in FIG. 1) through holes 24, and in the case of a movable arc contact, it is inserted through the through holes 24 and comes into contact with the fixed arc contact 1. are doing. The washers 22 are provided to allow the tension springs 5a, 5b to be wound approximately circularly, and three washers are used in FIG. 1.

The inner diameter d2 of the cylindrical conductor 3 is the diameter d1 of the fixed arc contact.
Make it slightly larger. When the breaking operation is started from the closing state shown in FIG. 1, the fixed arc contact 1 and the movable arc contact 2 are first separated;
Since the tip part of contacts the contact part 23 of the cylindrical conductor 3,
The current moves to the firing section 20 and is not opened first. When further moved in the interrupting direction, the arc generating part 20 and the fixed arc contact 1 are separated, and the wiping operation is completed. Since the arc generating part 20 is a place where an arc is generated when the circuit is opened, wear is reduced when a heat resistant member is used in a large current circuit breaker.

FIG. 2 shows a view along the ■-■ arrow in FIG. 1. The two-dot chain line indicates the movable arc contact after opening.

According to the present invention, the wipe distance is determined by the firing point 20 regardless of the force of the tension spring 5a, so it can be kept constant regardless of the separation speed.

Furthermore, the first firing point 20 does not have a slit, and the large diameter portion 21
It is possible to significantly reduce the electric field by attaching a Furthermore, as shown in FIG. 2, the slit d formed by the movable arc contact 2 and the through hole 24 of the cylindrical conductor 3 can be reduced by half compared to the conventional example shown in FIG. The heat-resistant member between the slits shown in Japanese Patent No. -155979 can also be omitted.

As a different embodiment, the single circular conductor 3 is replaced with an elastic conductor (
For example, it may be made of beryllium (copper) and may have a structure with thin slits. In this case, although the electric field is slightly reduced, even if the fixed arc contact 1 and the cylindrical conductor 3 are assembled with their center lines slightly different, they can be easily turned on.

As a further different example, it is also possible to provide a current-carrying stator on the outer periphery of the fixed arc contact and increase the current flowing by using the outer periphery 3o of the cylindrical conductor 3 as a movable main contact.

〔Effect of the invention〕

According to the invention, f! ! Since there is no slit that would affect the electric field between the electrodes, and the wipe distance does not change depending on the opening speed, the contact device can exhibit high voltage and large current interrupting performance.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the closing state of the contact device of the buffer type gas circuit breaker according to the present invention, FIG. 2 is a view taken along the nn arrow in FIG. 1, and FIG. FIG. 4 is a view taken from the IV-IV arrow in FIG. 3, FIG. 5 is a diagram showing the conventional contact device in the middle of breaking, and FIGS. 6 and 7 are explanatory diagrams showing the instant of contact opening by the conventional contact device. It is. 3... Cylindrical conductor, 24... Through hole, 2... Movable arc contact, 5... Tension spring, 1... Fixed arc contact, 11... Arc.

Claims (1)

[Claims] 1. A plurality of holes are provided on the circumference of the cylindrical conductor, passing through the outer circumferential surface and the inner circumferential surface, one end is inserted into the hole, and the other end is inserted on the circumference of the cylindrical conductor. A spring is provided on the first contact placed on the cylindrical conductor and its outer periphery, and the spring applies a contact force to the paired second contact inserted inside the cylindrical conductor;
Extinguishing the arc generated between the end face of the cylindrical conductor and the second contact when the first and second contacts are separated by spraying an arc-extinguishing gas. A contact device for a gas circuit breaker, characterized by: 2. A contact device for a gas circuit breaker according to claim 1, characterized in that a flat large-diameter portion is provided on the arc-generating end face of the cylindrical conductor. 3. Claim 1 or 2 is characterized in that the inner circumferential surface of the cylindrical conductor opposite to the end surface where the arc is generated is provided with a diameter smaller than the diameter of this inner circumferential surface. A contact device for gas circuit breakers. 4. A contact device for a gas circuit breaker according to claim 1, 2, or 3, characterized in that the cylindrical conductor is an elastic, heat-resistant conductor.