JPH0770278B2 - Gas circuit breaker - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a gas circuit breaker, and in particular, a first and a second that can be freely connected and separated.
The present invention relates to an improvement of a puffer type circuit breaker arranged so as to face a movable electrode.

[Technical background of the invention and its problems]

In recent years, power plants have been increasing in capacity with the increase in power demand. Moreover, due to the difficulty in constructing power plants in urban areas, where electricity is consumed in large quantities, transmission lines have become longer,
There is a trend toward higher voltage to improve this power transmission efficiency. With the increase in the capacity and voltage of such power transmission systems, the breaking capacity required for circuit breakers used in substations and switching stations is also increasing. In order to achieve such an improvement in the breaking capacity, what has been conventionally used in the transmission voltage system of 168 kV or higher is the puffer type gas circuit breaker. This has a simple circuit breaker structure and has excellent insulation and arc extinguishing performance due to the enclosed SF ₆ gas. In a sealed gas-insulated switchgear where the entire substation equipment is insulated with SF ₆ gas, the same insulating gas is used for the circuit breaker and other equipment, so insulation from other equipment is not possible. It is particularly well used because it can be coordinated and efficient in terms of equipment placement.

Such a puffer type gas circuit breaker conventionally used has the following structure. That is, the fixed electrode and the movable electrode are provided in the tank so as to face each other, and the insulating cylinder is provided so as to cover the outer sides of these both electrodes. The movable electrode is driven, and the insulating gas in the puffer portion is compressed to blow the insulating gas to the arc generated between the fixed electrode and the movable electrode to extinguish the arc. Further, there is a system of increasing the relative opening speed so as to increase the opening speed in order to improve the arc extinguishing performance. That is, as shown in FIG. 4, the second movable electrode 5a of the second movable electrode portion 5 arranged to face the first movable electrode 29 of the first movable electrode portion 3 is moved in the direction opposite to the moving direction of the first movable electrode 29. The system shown in the figure shows the loading state.

In this figure, a plurality of opposing electrode driving insulating rods 10 are arranged on the outer periphery of the puffer cylinder 27 with a constant distance from the puffer cylinder 27. The opposite electrode driving insulating rod 10 is connected to the operating rod 8 via a link device 9 provided between the operating electrode 8 and the operating rod 8 at the end portion on the driving device side (not shown). The link device 9 includes a link and a connecting rod, and is rotatably connected to the operating rod 8 and the counter electrode driving insulating rod 10 by setting a predetermined link ratio, and a part of the link device 9 is connected to a container (not shown). It is fixed to the insulating cylinder 7 which is fixed by insulation.

On the other hand, at the end of the opposite electrode driving insulating rod 10 on the side opposite to the driving device, a cylindrical current-carrying member 13 is attached coaxially therewith, and the current-carrying member 13 is supported and fixed on the side opposite to the driving device. Slidingly contacts the current-carrying conductor 15. This energizing member
The second movable electrode 5a is provided on the side line of the operation mechanism portion 13, that is, on the central axis 21, and constitutes the second movable electrode portion 5 that performs the opening / closing operation together with the first movable electrode 29.

In such a conventional gas circuit breaker, when a drive device (not shown) is operated in the closed state of FIG. 4, the operation rod 8 is driven at a predetermined speed in the right direction in the figure; The removed first movable electrode 29 moves to the right, and a blocking operation occurs with the second movable electrode 5a. On the other hand, as the operation rod 8 moves, the counter electrode driving insulating rod 10 connected to the operation rod 8 also moves to the left by the action of the link device 9 connected to the operation rod 8. Therefore, the second movable electrode 5a fixed to the counter electrode driving insulating rod 10 moves to the left, and the first movable electrode 29
The electrode is separated from and the contact is opened.

By the way, in the high-voltage gas circuit breaker as described above, when opening and closing, the central axis 21 of the current-carrying member 13 and the current-carrying conductor 15 that slides and supports the second movable electrode portion 5a is such that the current-carrying conductor 15 is on the drive device side. When it is supported from the opposite side, a slight dimensional error causes it to deviate from the central axis 21 of the first movable electrode 29. In particular, it becomes remarkable when the voltage becomes high and the gap length between the poles becomes long as in a high voltage gas circuit breaker.

As described above, if the first movable electrode portion and the second movable electrode portion are supported from different portions, there is a problem to be solved that it causes a shift of the central axis of each electrode.

[Object of the Invention]

The present invention has been made in consideration of the above points, and an object of the present invention is to increase the relative separation speed between the first movable electrode portion and the second movable electrode portion so that the central axes of both are not displaced. It is an object to provide a gas circuit breaker that is supported so as to coincide with each other and that the size in the radial direction is suppressed, and that the size is reduced.

[Outline of Invention]

According to the present invention, in order to achieve such an object, a link device having a supporting point which reverses the direction of the driving force is provided on the drive device side of the operating rod, and one end of the link device is connected to the operating rod. , The other end of this link device and the second movable electrode are connected by a plurality of insulating electrodes for driving the counter electrodes,
The second movable electrode and the slidable current-carrying conductor are supported by a supporting insulating rod that is fixed to the driving device side in the container and is provided between the opposing electrode driving insulating rods, and the supporting insulating rod and the opposing electrode driving insulating rod are supported. Are arranged on substantially the same circumference with the operating rod as the center, so that the relative separation speed between the first movable electrode portion and the second movable electrode portion is increased so that the central axes of the both can be aligned without shifting. It is characterized in that it is miniaturized by supporting it and suppressing the size in the radial direction.

Example of Invention

An embodiment of the gas circuit breaker of the present invention will be described below with reference to FIGS.
It will be described with reference to the drawings. The same parts as those in FIG. 4 are designated by the same reference numerals. 1 and 3 show the upper side of the central shaft 21 on the side of the insulating rod for driving the counter electrode, and the lower side on the side of the supporting insulating rod. That is, the gas circuit breaker body 1 is housed inside a container (not shown), and
An insulating gas 1a such as SF ₆ gas is enclosed. The gas circuit breaker main body 1 includes a first and a second facing each other, which are freely contactable and separable.
The movable electrode parts 3 and 5 are provided, and the puffer part 6 is provided adjacent to the first movable electrode part 3 to form the circuit breaker 4. Further, as will be described later, the puffer piston 28 of the puffer portion is the insulating cylinder 7.
Supported and fixed to the container side not shown by
The operation rod 8 that drives the movable portions of the first movable electrode portion 3 and the puffer portion 6 is connected to a drive portion (not shown) via an operation insulating rod 8a. Further, on the drive device side of the operation rod 8, a link device 9 having a supporting point and reversing the direction of the drive force is provided.
The link device 9 has one end connected to the operating rod 8 and the other end connected to one end of the counter electrode driving insulating rod 10. The second second movable electrode portion 5 is connected to the other end of the opposing electrode driving insulating rod 10. The fixed portion of the second movable electrode portion 5 is supported and fixed to the insulating cylinder 7 by the supporting insulating rod 11.

In the second movable electrode portion 5, the second movable electrode 5a is fixed substantially at the center of the holding member 12, and a cylindrical current-carrying member 13 is attached to the opposite side thereof, and a current-carrying conductor 15 slides on the current-carrying member 13. It is possible. Further, one end of each of a plurality of opposing electrode driving insulating rods 10 is connected to the holding member 12 via a mounting member 16, and the other end is connected via a mounting member 17 to the link device 9.
Connected to. Further, the holding member 12 is formed with a cutout portion 18. In the cutout portion 18, the current-carrying conductor 15 is attached to the insulating cylinder 7.
A supporting insulating rod 11 for supporting and fixing is inserted into the insulating cylinder 7, one end of the supporting insulating rod 11 is fixed to the current-carrying conductor 15 via a mounting member 19, and the other end of the supporting insulating rod 11 is connected to the insulating cylinder 7 via a mounting member 20. It is fixed.

The second movable electrode 5a is attached to the holding member 12 along the central axis 21 by an attachment arm member 12a formed in, for example, a spook shape in the approximate center.

Then, one end of the counter electrode driving insulating rod 10 is fixed via a mounting member 16 in a substantially equal arrangement on the circumference of the edge of the holding member 12. Further, the notches 18 are formed alternately and substantially equidistantly with the position where one end of the holding member 12 on the circumference is fixed.

The notch portion 18 is formed to have a diameter larger than that of the supporting insulating rod 11 or the mounting member 19 for the supporting insulating rod 11 inserted therein. Further, the cutout portion 18 may be formed in a through hole, and the diameter of the through hole is formed larger than this in order to insert the supporting insulating rod 11 or the mounting member 19 thereof.

Further, one end of the support insulating rod 11 inserted into the cutout portion 18 is fixed to the current-carrying conductor 15 via the mounting member 19, and the other end of the support insulating rod 11 is connected to the container side (not shown) via the insulating cylinder 7. It is fixedly supported. Further, in the drawing, the notch portions 18 are arranged in four substantially equal positions, and the counter electrode driving insulating rods 10 are respectively mounted via the mounting members 16 so as to be located between them.

Subsequently, the link device 9 is a link 2 rotatably supported by a fulcrum support member 22 fixed to the insulating cylinder 7 via a fulcrum 22a.
One end of 3 is connected to one end of the connecting rod 25, and the other end of the connecting rod 25 is rotatably attached to the operating rod 8. The other end of the link 23 is connected to one end of the connecting rod 26, and the other end of the connecting rod 26 is rotatably connected to the mounting member 17 of the opposing electrode driving insulating rod 10. For example, four counter electrode driving insulating rods 10 are each connected to the link device 9 as described above.

The first movable electrode portion 3 is attached to the puffer cylinder 27 of the puffer portion 6 adjacent thereto. The puffer portion 6 has the puffer cylinder 27 and a puffer piston 28 inserted therein, and the puffer piston 28 has a piston support member 28a.
It is fixed to the insulating cylinder 7 via. In addition, the first movable electrode portion 3
Is attached to the outside of the bottom of the puffer cylinder 27 so as to face the second movable electrode portion 5. One end of the operating rod 8 is fixed inside the bottom portion of the puffer cylinder 27, and has a hollow first movable electrode 29 communicating with the hollow portion 8b of the operating rod 8.
Are fixed, and the puffer cylinder 27 and puffer piston 28
The 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 communicating with the puffer chamber 30 and the communication hole 27a formed by
The movable electrode 5a is inserted into the nozzle throat 31b of the insulating nozzle 31, and is connected to the first movable electrode 29 and inserted.

In this way, the current-carrying conductor 5 which is slidable with the cylindrical current-carrying member 13 attached to the second movable electrode portion 5 and which supports the current-carrying member 13 is fixed to the insulating cylinder 7 arranged on the drive unit side. By supporting with the support insulating rod 11, it becomes possible to make the central axes 21 of the first movable electrode portion 3 and the second movable electrode portion 5 forming the blocking portion 4 substantially coincide with each other. Therefore, there is no misalignment that occurs when opening and closing the blocking portion 4. Further, the mounting positions of the counter electrode driving insulating rods 10 for driving the second movable electrodes 5a of the second movable electrode portion 5 are fixed substantially evenly on the circumference of the edge of the holding member 12, and this same circumference is fixed. The notch 18 is provided alternately on the above mounting position and the notch
Since the support insulating rod 11 is formed so as to be inserted into the block 18, the blocking portion 4 can be configured so as not to become large in the radial direction.

The present invention is not limited to the above-mentioned embodiment, and for example, the notch portion formed in the holding member 12 of the second movable electrode portion 5
As described above, even if the through holes 18 having a diameter larger than the diameters of the supporting insulating rod 11 and the mounting member 19 are provided, the same effect as that of the embodiment of the present invention can be exhibited.

〔The invention's effect〕

As described above, according to the present invention, a link device that reverses the direction of the driving force and has a support point is connected to the drive device side of the operating rod, and the link device and the second movable electrode are connected. Since the supporting insulating rods that support the second movable electrode and the current-carrying conductor that is slidable are arranged between the opposing electrode driving insulating rods, the supporting insulating rods are connected to each other. It is possible to provide a downsized gas circuit breaker because it can be stored in a tank without preventing deviation, improving reliability, and increasing the diameter of the blocking portion.

[Brief description of drawings]

1 to 3 show a gas circuit breaker according to the present invention.
The figure is a longitudinal sectional view in a closed state, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a longitudinal sectional view in an open state in FIG.
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 section, 4 ... Breaking section, 5 ... Second movable electrode section, 5a ... Second movable electrode, 6 ... Puffer Part, 7 ... Insulating cylinder, 8 ... Operation rod, 9 ... Link device, 10 ... Insulating electrode driving insulating rod, 11 ... Supporting insulating rod, 12 ... Holding member, 13 ... Energizing member, 15 ...... Current-carrying conductor, 16,17,19,20 ... Mounting member, 18 ... Notch, 21 ... Center axis, 22 ... Support point support member, 22a ... Support point, 23 ... Link, 25,26 ...... Connecting rod, 27 ...... Puffer cylinder, 27a ...... Communication hole, 28 …… Puffer piston 29 …… First movable electrode, 30 …… Puffer chamber 31 …… Insulation nozzle, 31a …… Gas flow path, 31b… … Nozzle throat.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-51-89157 (JP, A) JP-A-54-86778 (JP, A) Actual development-SHO-56-131649 (JP, U) JP-B-50- 7269 (JP, B1)

Claims (2)

[Claims] 1. A first movable electrode and a second movable electrode, which are freely contactable and separable, are arranged to face each other in a container sealed with an arc-extinguishing insulating gas.
The first movable electrode and the puffer cylinder are fixed to one end of an operation rod connected to a drive device, and the puffer cylinder and the puffer piston having a hole in which the operation rod slides are slidably contacted in the puffer cylinder. , Compressing the insulating gas in the puffer cylinder, ejecting the compressed gas as a high-speed gas flow from an insulating nozzle concentrically fixed to the outside of the puffer cylinder, and between the opposing first and second movable electrodes. In a gas circuit breaker that extinguishes arcs by blowing on the generated arc, reverse the direction of the driving force to the driving device side of the operating rod,
A link device having a supporting point, one end of the link device is connected to the operation rod, and the other end of the link device is connected to the second movable electrode by a plurality of opposing electrode driving insulating rods. The second movable electrode is supported by a supporting insulating rod provided between the opposing electrode driving insulating rods fixed to the driving device side in the container, the supporting conductor being opposed to the supporting insulating rod. A gas circuit breaker, characterized in that the electrode driving insulating rods are arranged on substantially the same circumference with the operating rod as the center. 2. The insulating rod for driving the counter electrode is the second rod.
A notch larger than the outer diameter of the supporting insulating rod formed on the same circumference of the holding member, which is connected to the outer peripheral portion of the holding member of the movable electrode so as to be equally distributed on the same circumference. The gas circuit breaker according to claim 1, wherein the gas circuit breaker is arranged so as to be inserted through a portion or a through hole.