JPH0743983B2 - Puffer type gas circuit breaker - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to an arc extinguishing chamber of a puffer type gas circuit breaker.

[Technical background of the invention and its problems]

With the increase in capacity of power transmission systems, the breaking capacity required for circuit breakers used in substations and switchyards is also increasing, and high reliability is required. In order to increase the reliability of the circuit breaker, it is important to reduce the number of parts and simplify the structure. Therefore, the break point of the breaker is reduced. Therefore, it is necessary to increase the breaking capacity per point of the breaker.

In the conventional general puffer type gas circuit breaker, it is necessary to increase the pressure in order to improve the blocking performance.Therefore, a large puffer cylinder is moved at a fast opening speed, and the gas in the huffer chamber is pressurized to a high pressure. You can increase the blocking capacity by spraying on.

However, such a method not only increases the size of the arc-extinguishing chamber, but also requires a large drive unit, which reduces the economical efficiency of manufacturing and operating the circuit breaker.

As a method of suppressing such economic loss and efficiently increasing the gas pressure in the puffer chamber, a method of utilizing the thermal energy of the arc has been proposed. It has been found that if this heat energy is skillfully used, the pressure of the gas in the puffer chamber can be increased and a strong arc spray can be obtained, so that the blocking performance can be improved.

However, in the case of introducing the thermal energy by the arc into the puffer chamber, the gas that has become hot due to the arc is introduced into the puffer chamber, and it is a major drawback that the components are damaged by the temperature at the opening and its surroundings. It is an obstacle to actual application.

[Object of the Invention]

The present invention has been made in view of the above circumstances, and provides a puffer-type gas circuit breaker that can obtain high blocking performance with a small size and small driving energy by effectively utilizing the thermal energy of the arc at the time of blocking. It is an object of the invention.

[Outline of Invention]

In order to achieve the above object, the present invention, when the arc energy at the initial stage of the cutting operation of the puffer type gas circuit breaker is taken into the puffer chamber through the hollow portion of the drive rod, a high temperature gas flows from the opening of the drive rod to the puffer chamber constituent members. A shield plate is provided on the extension line in the radial direction of the opening so as not to be directly blown, and the hot gas flow is diffused to reduce damage to the puffer chamber constituent members such as the inner wall of the puffer cylinder.

Further, the shield plate of the drive rod opening provided in the puffer chamber is configured to fit with the inlet for blowing the compressed gas between the arc contacts when the shield plate is shut off from the puffer chamber in the open state, and the dead near the end of the shutoff operation. Reduce volume.

Example of Invention

An embodiment of the present invention will be described below with reference to FIGS.

(Structure) FIG. 1 shows the initial state of the shutoff operation of the arc-extinguishing chamber according to the present invention, and FIG. 3 shows the open state.

In FIG. 1, reference numeral 1 denotes a fixed contactor portion, which is composed of a fixed arc contactor 4 and a fixed energization contactor 3. Reference numeral 2 is a movable contactor, and a puffer cylinder 6, a movable arc contactor 8, a movable energizing contactor 9, and an insulating nozzle 10 are fixed to a hollow drive rod 5. Movable contact part 2
In, the puffer cylinder 6 forms a puffer chamber 11 with the puffer piston 7 fixed to a fixing portion (not shown). Further, in the movable part contactor part 2, a hole 5a for communicating the hollow part 5b of the drive rod 5 with the outside thereof.
As shown in FIG. 1, at the beginning of the cutting operation,
The hollow portion 5b of the drive rod 5 and the puffer chamber 11 are processed to communicate with each other.

As shown in FIG. 3, this hole is configured to communicate the hollow portion 5b of the drive rod 5 and the exhaust chamber 16 when passing through the partition wall portion 7a of the puffer piston 7 in the latter half of the shutoff operation and in the open state. A shield plate 15 is provided in the opening provided in the drive rod, and the shield plate 15 is located on the radial extension of the opening as shown in the sectional view of FIG.

Further, in the open state of FIG. 3, the shield plate 15 is fitted to the inlet port 14a of the gas passage 14.

(Operation) Next, the operation of the present invention will be described with reference to FIGS.

As described above, FIG. 1 shows the initial state of the cutting operation. In this state, the arc 13 generates a large amount of heat, but since the nozzle 10 has not been sufficiently opened, it has no ability to cut off. In the cutoff state shown in the figure,
The hole 5a of the drive rod is still the partition wall of the puffer piston 7.
The hole 5a communicates with the inside of the puffer chamber 11 since it does not pass through 7a.

On the other hand, in the initial stage of such shutoff, the puffer chamber 11
Since the internal pressure has not risen so much, the expansion flow of gas from the arc 13 flows through the hollow portion 5b of the rod 5 in the flow 12
b, which flows into the puffer chamber through the hole 5a, but hits the shield plate 15 and diffuses throughout the puffer chamber to generate the hot gas flow 12
c reduces damage to the members forming the puffer chamber, particularly the inner wall of the puffer cylinder 6. The diffusion direction of this flow is also shown in FIG. 2 by the arrow of flow 12e.

Further, in the open state of FIG. 3, the shield plate 15 and the introduction port 14a of the gas flow path 14 for guiding the compressed gas from the puffer chamber to the fixed arc contact 4 and the movable arc contact 8 are fitted together, The dead volume of the puffer chamber 11 in the open state is reduced, which increases the ratio of the amount of gas supplied between the arc contacts to the total amount of gas in the puffer chamber 11 and helps to improve the energy efficiency as a whole. ing.

Further, FIG. 3 shows a gas table at the final stage of the cutting operation, and this gas flow 12d is discharged to the exhaust chamber 16 which is partitioned from the puffer chamber by a partition wall.

(Modification) This is an example in which a shield plate for diffusing a gas flow that has become a high temperature gas due to an arc is provided on the extension line in the radial direction of the drive rod opening and inside the opening, that is, inside the drive rod. As shown by the arrow 12f, it is diffused in the puffer chamber, and its effect is the same as that of the example shown in FIG.

FIGS. 5 and 6 show modified examples of the shield plate.

FIG. 5 shows that although it has a hole 18a out of the overall tubular shape, the tubular shape receives the force of the hot gas flow to improve the mechanical strength. FIG. 6 shows the tubular portion. This is an example of a punched steel plate.

〔The invention's effect〕

As described above, according to the present invention, the radius of the opening portion of the drive rod is increased when the temperature of the drive rod is increased by the arc and the hot gas flow is introduced into the puffer chamber in the first half of the cutting operation to obtain a higher puffer chamber pressure. It is possible to provide a small-sized, high-performance and long-life gas circuit breaker in which the hot gas flow is diffused by the shield plate provided on the extension line of the direction, damage to the puffer chamber constituent members is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing an embodiment of an initial stage of a cutting operation of the present invention,
FIG. 2 is a view showing a cross section taken along the line XX of FIG. 1, FIG. 3 is a view showing the latter stage of cutting and an open state of the present invention, and FIG. 4 is a view of a modified example of the present invention, FIG. 5, and FIG. The figure shows a modified example of the shield plate. 1 ... Fixed contact part, 2 ... Movable contact part, 3 ... Fixed current contact part, 4 ... Fixed arc contact part, 5 ... Drive rod, 5a ... Drive rod hole, 5b ... Drive Hollow part of rod,
6 ... Puffer cylinder, 7 ... Puffer piston, 7a
...... Puffer piston partition wall, 8 ... Movable arc contactor,
9 ... Movable energizing contact, 10 ... Insulating nozzle, 11 ... Puffer chamber, 12 ... Gas flow, 12a, 12b, 12c, 12d, 12e, 12f.
Hot gas flow, 13 ... Arc, 14 ... Gas flow path, 14a ... Gas flow path inlet, 15 ... Shield plate, 16 ... Exhaust chamber, 17 ...
… Shield board.

Claims (2)

[Claims] 1. A puffer chamber composed of a puffer piston and a puffer cylinder, which has a fixed contact part and a movable contact part that can be contacted and separated from each other in a container filled with an arc-extinguishing gas, and which is provided in the movable contact part. By compressing the gas to guide it to the nozzle, the arc generated between the fixed and movable arc contacts is cooled and extinguished, and an opening is provided in the wall of the hollow drive rod that drives the Pappa cylinder. In the puffer type gas circuit breaker configured such that the hollow drive rod communicates with the puffer chamber and the exhaust chamber partitioned by the puffer piston in the open state, and the hollow drive rod communicates with the puffer chamber in the closed state. A puffer-shaped girder characterized in that a shield plate having a larger area than the opening is provided on a radial extension line of the opening that connects the hollow portion of the drive rod and the puffer chamber. Circuit breaker. 2. A shield plate having an opening for communicating a hollow portion of a drive rod provided in the puffer chamber and the puffer chamber with each other according to claim 1, wherein gas is introduced from the puffer chamber to the fixed and movable arc contacts. A puffer-type gas circuit breaker characterized in that it is configured to substantially coincide with an inlet of a gas flow path on an extension line in an axial direction, and that the shield plate and the inlet are fitted to each other in an open state.