JPS62172616A - Buffer type gas blast 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] [Technical field of 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]

As the capacity of power transmission system readers increases, the breaking capacity required of circuit breakers used in substations and switchyards also increases, and high reliability is also required. In order to improve the reliability of circuit breakers, it is important to reduce the number of parts and simplify the structure. Therefore, efforts are being made to reduce the number of breaking points of circuit breakers.

Therefore, it is necessary to increase the breaking capacity per point of the circuit breaker.

In a typical sofa type gas circuit breaker, it is necessary to provide a bias in order to improve the circuit breaker performance. Breaking performance can be improved by moving a large puffer cylinder at a high opening speed and blowing the gas in the buffer chamber at high pressure onto the arc.

Conventionally, such methods have been used to improve the breaking performance of puffer type gas circuit breakers.

However, such a method not only increases the size of the arcing chamber but also requires a large drive device, making the circuit breaker uneconomical to manufacture and operate.

As a method of suppressing such economic losses and efficiently increasing the gas pressure in the buffer chamber, a method of utilizing the thermal energy of the arc has been proposed.

If this thermal energy is used skillfully, the pressure of the gas in the buffer chamber can be increased and powerful spraying can be obtained.

Therefore, it has been found that by using such a method, excellent interrupting performance can be obtained in a small arc extinguishing chamber.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and by effectively utilizing the thermal energy of the arc at the time of interruption, it is compact and exhibits excellent interruption performance with small drive energy, and it also enables parts inside the compression chamber to be However, the objective is to obtain a puffer-type gas circuit breaker that does not burn out due to thermal energy.

[Summary of the invention]

In order to achieve the above object, the present invention takes the arc energy at the initial stage of the breaking operation of the puffer type gas circuit breaker into the compression chamber through the hollow part of the drive rod, utilizes it to increase the pressure rise in the compression chamber, and interrupts the operation. In the latter stage of operation, the hollow part of the drive rod is configured to be a heat exhaust path for heat from the arc, and the puffer piston part is provided with a check valve part that allows gas to flow into the compression chamber during the closing operation of the circuit breaker. Provided.

A heat-resistant cover is provided on the check valve portion so that the components of the check valve do not burn out due to thermal energy when heat is taken into the puffer cylinder at the initial stage of opening.

[Embodiments of the invention]

The structure and operation of an embodiment of the present invention will be explained with reference to the drawings.

FIG. 1 shows the initial state of the arc-extinguishing chamber shutoff operation according to the present invention. Further, FIG. 3 shows the latter stage of the shutoff operation in the present invention.

〔composition〕

In FIG. 1, reference numeral 1 denotes a fixed contact section, which is composed of a fixed arc contact 4 and a fixed current-carrying contact 3. Further, 2 is a movable contact portion, and a puffer cylinder 6, a movable arc contact 8, a movable energizing contact 9, and an insulating nozzle IO are fixed to a hollow drive rod 5. In the movable part contactor part 2.

The puffer cylinder 6 forms a compression chamber 11 with a puffer piston 7 fixed to a fixed part (not shown). Further, in the movable part contactor part 2, the hole 5a communicating between the hollow part 5b of the drive rod 5 and the outside thereof is the first hole 5a.
As shown in the figure, the driving rod hollow portion 5b and the inside of the compression chamber 11 are processed to communicate with each other in the initial stage of the shutoff operation. (Fig. 1) As shown in Fig. 3, when this hole 5a passes the end 7a of the puffer piston 7 in the latter half of the shutoff operation, yJfi and the hollow part 5b of the IAs rod 5 are formed.
and the surrounding gas space. A convex portion 5C is provided at the rear end of the hollow portion 5b of the drive rod 5 to smoothly guide the flow of gas in the axial direction to the hole 5a.

Also, a check valve 14 is provided at the end 7a of the puffer piston 7.
is installed. The details of this part are shown in FIG. As shown in FIG. 2, the check valve section 14 includes a valve 14a, a spring 14b that presses the valve 14a, and a fixing screw 1 that determines their positions.
4c, it is constituted by a heat-resistant plate 14d. The material of the heat-resistant plate is a metal such as stainless steel or iron, which has better heat resistance than aluminum, which is the material of the puffer piston, or an insulator with excellent heat resistance, such as Teflon, as shown in Figure 2. , a spring 14b covering the puffer piston surface and a spring 14b, which is an element of the check valve, and a spring 14 covering the valve 14a.
b and the head of the fixing screw 14c.

This check valve is used to prevent a significant drop in the pressure in the compression chamber when it is turned on, and when the volume inside the compression chamber expands and the pressure drops when it is turned on, the valve 14a resists the force of the spring 14b. It moves to the left in the figure, and communicates with the compression chamber 1 through the gas atmosphere through the communication hole 7b.

[Effect]

As described above, FIG. 1 shows the initial state of the shutoff operation.

In this state, the arc 13 is generating a large amount of heat, but the nozzle 10 has not yet opened sufficiently, so there is no ability to shut it off. Furthermore, in the disconnected state shown in the figure, the hole 5a of the drive rod has not yet passed the end 7a of the puffer piston 7, so that the hole 5a communicates with the inside of the compression chamber 11.

On the other hand, at such an early stage of shutoff, the pressure inside the compression chamber 11 has not increased much, so the expanding flow of gas from the arc 13 is caused by the flow 1 passing through the hollow portion 5b of the rod 5.
2b, and the expansion flow 1 suddenly flows into the compression chamber 11.
2c also occurs in conventional puffer-type gas circuit breakers, but the thermal flow 12b is very large and therefore the compression chamber ll
It can effectively give heat to the gas inside. Since this is added to the original compression operation by the puffer piston 7 and the puffer cylinder 6, the pressure in the compression chamber becomes considerably higher than in a conventional puffer type gas circuit breaker.

In this process of taking in thermal energy, the hot gas flow 12b (flow to the compression chamber) shown in FIG. There is a risk that the spring 14b, valve 14a, etc. will be damaged by melting. If these become damaged and no longer function, gas may not be sucked in sufficiently during injection, or the valve may remain open, causing gas to leak. This causes a significant drop in performance.

In the present invention, as shown in FIG. 2, a heat-resistant cover 14d is provided to cover the check valve portion 14 and the puffer piston end portion 7a.
is fixed.

Therefore, the hot gas flow 12b from the rod hole 5a does not damage the aforementioned elements of the check valve 14 and the puffer piston end 7a. Therefore, the blocking performance does not deteriorate.

Thereafter, as shown in FIG. 3, the hole 5a passes through the end 7a of the puffer piston 7 and communicates around it.

Therefore, the hollow portion 5b of the drive rod 5 is open to the surrounding gas, and heat from the arc is released. In such a state, the nozzle 10 is already fully opened and is in a state where the large current can be interrupted. The heat introduced into the compression chamber 11 is distributed almost uniformly within the cylinder, so that the high pressure increase persists until the end of the shutoff operation. Therefore, high-speed gas flow is blown onto the arc for a long period of time, so high breaking performance can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, a higher pressure rise can be obtained in the compression chamber than in the conventional example, so excellent shutoff performance can be obtained with a small arc extinguishing chamber and a small drive device.
However, the components of the compression chamber are not damaged by thermal energy. follow

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the configuration of an embodiment of the present invention and the initial state of the shutoff operation, and FIG. 2 is a cross-sectional view showing the detailed configuration of the essential parts of the check valve and its function in an embodiment of the present invention. , FIG. 3 is a sectional view illustrating the operation in the latter half of the shutoff operation as an operation of an embodiment of the present invention. 1... Fixed contact part, 2... Movable contact part, 3
...Fixed current-carrying contact, 4...Fixed arc contact,
5... Drive rod, 5a... Drive rod hole part, 5b... Drive rod hollow part, 5c... Convex part, 6
... Puffer cylinder, 7... Puffer piston,
7a... Puffer piston end, 8... Movable arc contact, 9... Movable energizing contact. lO...Insulating nozzle, 11...Compression chamber, 12...
・Gas flow, 12a, 12b, 12cm hot gas flow, 1
3-... Arc, 7b... Communication hole, 14... Check valve, 14a... Valve, 14b... Spring, 14
c...Fixing screw, 14d...Heat-resistant cover. Agent Patent Attorney Nori Chika Yudo Hirofumi Mitsumata

Claims (1)

[Claims] (1) A compression chamber that has a fixed contact part and a movable contact part that can be moved in and out, and a puffer piston and a puffer cylinder provided in the movable contact part in a container filled with arc-extinguishing gas. Compressing a gas by reducing its volume
In a puffer-type gas circuit breaker that guides the generated gas flow to a nozzle part and blows it onto the arc generated between fixed and movable arc contacts, cooling and extinguishing the arc, the hollow operating rod that drives the puffer cylinder is A hole is provided in the part to communicate the outer diameter and the inner diameter, and the hollow part of the operating rod and the compression chamber are communicated through the hole at the initial stage of the shutoff operation,
In the latter half of the interrupting operation, the hollow part of the operating rod and the container are configured to communicate through the hole, and the puffer piston part is configured to allow gas to flow into the compression chamber during the closing operation of the circuit breaker. A puffer-type gas circuit breaker, characterized in that it is provided with a stop valve part, and the check valve part has a heat-resistant cover that protects the elements of the valve part.