JPS6288230A - Gas circuit 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 the Invention] The present invention relates to a gas circuit breaker, and particularly relates to a first and a second gas circuit breaker that can be freely connected and separated.
This invention relates to an improvement in a buffer type circuit breaker placed opposite a movable electrode.

[Technical background of the invention and its problems]

In recent years, power plants have been increasing their capacity as the demand for electricity increases. Moreover, due to the difficulty in constructing power plants in urban areas where large amounts of electricity are consumed, power transmission lines are becoming longer and longer.
There is a trend toward higher voltages to improve power transmission efficiency. As power transmission systems become larger in capacity and higher in voltage, the breaking capacity required of circuit breakers used in substations and switchyards continues to increase. In order to achieve such an improvement in breaking capacity, buffer type gas circuit breakers have been conventionally used in power transmission voltage systems of 168 kV or higher.

This circuit breaker has a simple structure and has excellent insulation and arc extinguishing performance due to the enclosed SF and gas. In addition, in sealed gas-insulated switchyards where all substation equipment is insulated with SF or gas, the same insulating gas is used for circuit breakers and other equipment, so insulation from other equipment is It is particularly popular because it allows for coordination and is efficient in terms of equipment placement.

The conventionally used buffer type gas circuit breaker has the following structure. That is, a fixed electrode and a movable electrode are provided facing each other in the tank, and an insulating tube is provided to cover the outside of these surface electrodes. When the movable electrode is driven, the insulating gas in the buffer section is compressed, and the insulating gas is sprayed onto the arc generated between the fixed electrode and the movable electrode to extinguish the arc. Furthermore, in order to improve the arc-extinguishing performance, there is a method in which the relative opening speed is increased to increase the opening speed. That is, as shown in FIG. 4, the second movable electrode 5a of the second movable electrode section 5, which is arranged opposite to the first movable electrode 29 of the first prayer electrode section 3, is moved in the opposite direction to the moving direction of the first movable electrode 29. The figure shows the inserted state.

In this figure, on the outer periphery of the puffer cylinder 27, a plurality of insulating rods 10 for driving the counter electrode are arranged at a constant distance from the puffer cylinder 27. The insulating rod 10 for driving the counter electrode is provided with a link device 9 between it and the operating rod 8 at the end on the driving device side (not shown).
It is connected to the operating rod 8 via. Link device 9
is equipped with a link and a connecting rod, and is set to a predetermined link ratio and is rotatably connected to the operating rod 8 and the insulating rod IO for driving the counter electrode, and a part of the link device 9 is insulated and fixed to a container (not shown). It is fixed to the insulation a7.

On the other hand, a cylindrical current-carrying member 13 is attached coaxially to the end of the insulating rod 10 for driving the counter electrode on the side opposite to the drive device, and this current-carrying member 13 is supported and fixed on the side opposite to the drive device. It is in slidable contact with the current-carrying conductor 15. A second movable electrode 5a is provided on the side line of the operation mechanism section of the current-carrying member 13, that is, on the central axis 21, and constitutes a second movable electrode section 5 that performs opening and closing operations together with the first movable electrode 29.

In such a conventional gas circuit breaker, when the drive device (not shown) is operated in the closed state shown in FIG. The first movable electrode 29
moves to the right, and a breaking operation occurs between it and the second movable electrode 5a. On the other hand, as the operating rod 8 moves, the counter electrode driving insulating rod 10 connected thereto also moves to the left due to the action of the link device 9 connected to the operating rod 8. Therefore, the second movable electrode 5a fixed to the counter electrode driving insulating rod 10 moves to the left and separates from the first movable electrode 29 to be in an open state.

By the way, when opening and closing the high-voltage gas circuit breaker as described above, the central axis 21 of the current-carrying member 13 and the current-carrying conductor 15 that slide and support the second movable electrode portion 5a is such that the current-carrying conductor 15 is on the driving device side. If it is supported from the opposite side, the first movable electrode 29 will be displaced from the central axis 21 due to a slight dimensional error. This is particularly noticeable when the voltage becomes high and the gap length between poles becomes long, such as in a high-voltage gas circuit breaker.

As mentioned above, supporting the first movable electrode part and the second movable electrode part from different parts causes a misalignment of the center axes of the respective electrodes, which is a problem that needs to be solved.

[Purpose of the invention]

The present invention has been made in consideration of the above points.

The purpose of this is to increase the relative separation speed between the first movable electrode part and the second movable electrode part, support them so that their center axes coincide without shifting, and suppress their radial size. The object of the present invention is to provide a gas circuit breaker that is compact in size.

[Summary of the invention]

According to the present invention, this object is achieved.

One end of a plurality of insulating rods for driving a plurality of counter electrodes is fixed at equal intervals on the circumference of the edge of the holding member to which the second movable electrode of the second movable electrode part is fixed, and Cutouts or through-holes larger than the diameter of the supporting insulating rod are formed alternately with the positions where the above-mentioned one end is fixed, and one end of the supporting insulating rod inserted through these is energized so that it comes into sliding contact with the second movable electrode. The conductor is fixedly supported, and the insulating rod for driving the counter electrode is connected to the operating rod of the first movable electrode part via a link device, and the other end of the supporting insulating rod is insulated and fixed to the container side, so that the insulating rod for driving the counter electrode is connected to the operating rod of the first movable electrode part. The second movable electrode part is characterized by increasing the relative opening speed between the movable electrode part and the second movable electrode part, supporting them so that their central axes coincide without shifting, and suppressing the size in the radial direction to achieve miniaturization. do.

[Embodiments of the invention]

An embodiment of the gas circuit breaker according to the present invention is shown in FIGS. 1 to 3 below.
This will be explained with reference to the figures. The same parts as in FIG. 4 are given the same reference numerals. Moreover, FIGS. 1 and 3 show the insulating rod for driving the counter electrode above the central axis 21, and the support rod side below the central axis 21. That is, the gas circuit breaker main body 1 is housed inside a container (not shown), and an insulating gas 1a such as SF or gas is sealed inside the container.

This gas circuit breaker main body 1 has first and second movable electrode parts 3 and 5 facing each other and is movable, and a buffer part 6 is provided adjacent to the first movable electrode part 3 to form a circuit breaker 4. do. Further, as will be described later, the buffer section 6 is supported and fixed to the container side (not shown) by an insulating cylinder 7, and an operating rod 8 that drives the movable parts of the first movable electrode section 3 and the buffer section 6.
is connected to a drive section (not shown) via an operation insulating rod 8a. Further, the operating rod 8 is connected to an insulating rod 10 for driving a counter electrode via a link device 9, and the movable part of the second movable electrode section 5 connected to the insulating rod 10 for driving a counter electrode is directed in the opening direction when the movable part is opened. At the same time, the movable parts of the first movable electrode part 3 and the buffer part 6 are driven in the opening direction via the operating rod 8 when opening the pole. Also the second
A fixed portion of the movable electrode portion 5 is supported and fixed to the insulating cylinder 7 by a support insulating rod 11.

The second movable electrode section 5 holds the second movable electrode 5a with the holding member 12.
A cylindrical current-carrying member 13 is attached to the opposite side thereof, and a current-carrying conductor 15 is slidably provided on the current-carrying member 13. Further, one end of a plurality of counter electrode drive insulating rods 10 is connected to the holding member 12 via a mounting member 16, and the other end is connected to the link device 9 via a mounting member 17, respectively. Further, the holding member 12 is provided with a notch 18, and each of the plurality of support insulating rods 11 is inserted through the notch 18 to fix the current-carrying conductor 15 via the mounting member 19. One end is fixed, and each other end is fixed to the insulating cylinder 7 via a mounting member 20, so that the current-carrying conductor 15 is supported and fixed.

The second movable electrode 5a is mounted approximately at the center of the holding member 12 along the central axis 21 by a mounting arm member 12a formed in the shape of a spork, for example.

Then, one end of the insulating rod 10 for driving the counter electrode is fixed to the circumference of the holding member 12 at approximately equal intervals via the mounting member 16 . Further, one end of the holding member 12 on the circumference is fixed via a mounting member. Further, notches 18 are formed alternately and approximately equally spaced with the positions where one end of the holding member 12 is fixed on the circumference.

This notch 18 has a support insulating rod 1 inserted therein.
1 or its mounting member 19. Further, the notch 18 may be formed as a through hole, and the diameter of this through hole is also formed larger than this in order to allow the support insulating rod 11 or its attachment member 19 to be inserted therethrough.

Further, the support insulating rod 1 inserted through this notch 18
One end of the supporting insulating rod 11 is fixedly attached to the current-carrying conductor 15 via a mounting member 19, and the other end of the supporting insulating rod 11 is fixedly supported via an insulating tube 7 to a container side (not shown). In addition, in the illustration, the notch 1
8 are arranged approximately equally in four locations, and insulating rods 10 for driving the counter electrode are attached at approximately equal intervals through attachment members 16 so as to be located between the four locations.

Next, the link device 9 connects one end of the link 23, which is rotatably supported by the fulcrum support member 22 fixed to the insulating tube 7 via the fulcrum 22a, to one end of the connecting rod 25, and connects the connecting rod 2.
5 is rotatably attached to the operating rod 8. Further, the other end of the link 23 is connected to one end of a connecting rod 26, and the other end of the connecting rod 26 is rotatably connected to the insulating rod 1 for driving the counter electrode.
0 mounting member 17.

For example, the four counter electrode drive insulating rods 10 are each connected to the link device 9 as described above.

The first movable electrode section 3 is attached to the puffer cylinder 27 of the buffer section 6 adjacent thereto. The buffer part 6 includes this puffer cylinder 27 and the puffer piston 2 inside it.
8 is inserted, and this puffer piston 28 is fixed to the insulating cylinder 7 via the piston support member 28a. Further, the first movable electrode section 3 is attached to the outside of the bottom of the puffer cylinder 27 so as to face the second movable electrode section 5. One end of the operating rod 8 is fixed to the inside of the bottom of the puffer cylinder 27, and a first movable electrode 29 having a hollow communicating with the hollow part 8b of the operating rod 8 is fixed to the puffer cylinder 27.
An insulating nozzle 31 is fixed to the outside of the bottom of the puffer cylinder 27 so as to form a gas flow path 31a that communicates with the buffer chamber 30 formed by the buffer chamber 30 formed by the buffer chamber 30 and the communication hole 27a, and the second movable electrode when closed. 5a is inserted into the nozzle throat 31b of the insulating nozzle 31.

and is inserted in contact with the first movable electrode 29.

In this way, the current-carrying conductor 15, which is slidable with the cylindrical current-carrying member 13 attached to the second movable electrode portion 5 and supports the bracket current-carrying member 13, is fixed to the insulating tube 7 disposed on the drive device side. By supporting with the support insulating rod 11, it becomes possible to make the respective central axes 21 of the first movable electrode part 3 and the second movable electrode part 5, which form the blocking part 4, almost coincide with each other. for that.

This eliminates the wicking that occurs when the blocking section 4 is opened and closed. Furthermore, the second
The second possible part of the movable electrode part 5! The mounting of the insulating rod 10 for driving the counter electrode that drives the PlI electrode 5a is performed using the holding member 12.
The support insulating rods 11 are fixed at approximately equal intervals on the circumference of the rim, and notches 18 are provided on the same circumference at alternating positions with the above-mentioned mounting positions, and the supporting insulating rods 11 are inserted through the notches 18. Therefore, it is possible to configure the blocking portion 4 so that it does not become large in the radial direction.

Note that the present invention is not limited to the above-mentioned embodiments. For example, the notch 18 formed in the holding member 12 of the second movable electrode portion 5 may have a diameter larger than that of the support insulating rod 11 and the mounting member 19 as described above. Even if a through hole is provided, it is possible to achieve the same effect as the embodiment of the present invention.

〔Effect of the invention〕

As explained above, according to the present invention, the insulating rod for driving the counter electrode that drives the second movable electrode section is attached to the holding member of the second movable electrode section on the same circumference as the position of the supporting insulating rod. By providing a larger notch or through hole and inserting the support insulating rod into it, the first and second movable electrode parts can be supported from the same location, preventing mutual misalignment and improving reliability. Moreover, it is possible to provide a miniaturized gas circuit breaker because it can be stored in a tank without increasing the diameter of the shutoff part.

[Brief explanation of drawings]

1 to 3 show the gas circuit breaker of the present invention, and the first
The figure is a vertical cross-sectional view of the closed state, Figure 2 is a cross-sectional view taken along the line ■-■ in Figure 1, Figure 3 is a vertical cross-sectional view of the open state of Figure 1, and Figure 4 is a vertical cross-sectional view of the closed state.
The figure is a longitudinal sectional view of a conventional gas circuit breaker. 1... Gas circuit breaker body, 1a... Insulating gas, 3.
...first movable electrode part, 4...blocking part, 5...second
Movable electrode part, 5a... Second movable electrode, 6... Buffer part, 7... Insulating cylinder, 8... Operating rod 9... Link device, 10... Insulating rod for driving counter electrode , 11... support insulating rod, 12.
...Holding member, 13...Electrifying member, 15...
- Current-carrying conductor, 16.17, 19.20... mounting member,
18... Notch portion, 21... Central axis, 22
...Fulcrum support member 22a...Fulcrum. 23... Link, 25, 26... Connecting rod, 27... Puffer cylinder, 27a... Communication hole,
28...puffer piston 29...1st possible! PII electrode, 30... Buffer chamber 31... Insulated nozzle, 31a... Gas flow path, 31b... Nozzle throat.

Claims (2)

[Claims] (1) First and second movable electrodes, which can be moved toward and away from each other, are arranged facing each other in a container sealed with an arc-extinguishing insulating gas, and the first movable electrode and the puffer cylinder are connected to a drive device. the puffer cylinder fixed to one end of the operating rod;
Compressing the insulating gas in the puffer cylinder with a puffer piston sliding inside the puffer cylinder,
This compressed gas is ejected as a high-speed gas flow from an insulated nozzle fixed to the puffer cylinder, and
and a gas circuit breaker that extinguishes an arc generated between the second movable electrodes by connecting a link device to the driving device side of the operating rod, which reverses the direction of this driving force and has a support point, This link device and the second movable electrode are connected by a plurality of insulating rods for driving the counter electrode, and a support that alternately supports the current-carrying conductor that is slidable on the second movable electrode with the insulating rod for driving the counter electrode. A gas circuit breaker characterized by being equipped with an insulating rod. (2) A circle in which the insulating rods for driving the counter electrode are arranged equidistantly around the outer periphery of the supporting member to which the second movable electrode is fixed - Cutouts or through holes larger than the outer diameter of the supporting insulating rods are alternately arranged on the circumference. 2. The gas circuit breaker according to claim 1, further comprising: a supporting insulating rod supporting an energized conductor that is in sliding contact with the second movable electrode;