JPH01132022A - Buffer type gas circuit breaker - Google Patents

Abstract

PURPOSE:To improve durability and reliability by arranging a damper device on the side opposite to the drive device of a 2nd movable electrode attached to an insulation rod so that a flange portion provided on the movable electrode compresses gas in the damper device and that a control operation force works in the direction opposite to movement. CONSTITUTION:When a flange 35 is inserted into a damper device 33, compression of gas in the damper device 33 by a flange surface 35 begins. Further movement of the flange 35 increases the compression ratio of the gas. As a result, a force resisting the gas compression force in the damper device 33 is exerted on the flange surface 35, the flange 35 is braked, and a brake force is also applied to a 2nd movable electrode 36 attached to the flange 35. An inertial force produced when the 2nd movable electrode 36 stops reduces the tensile force in an insulation rod 24. As a result, no excessive tensile forces are applied to the insulation rod 24 and a link device 18 to improve both durability and reliability.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention relates to a gas circuit breaker used in a power system substation or switchyard.
In a gas circuit breaker that moves in a direction opposite to the direction in which the second movable electrode moves, the second movable electrode slides freely within a guide fixed to the second movable electrode. Buffer-type gas cutoff in which the two movable electrodes are damped by a damper provided on the second movable electrode side, and when the opposing electrode is stationary, excessive tensile force is not applied to the insulating rod due to the inertial force of the opposing second movable electrode. Concerning the extinguishing of the vessel.

(Prior Art) As the capacity of power transmission systems increases, the breaking capacity of circuit breakers used in substations and switchyards increases, and high reliability is required. In order to increase 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 the conventional one-boat fishing puff 7 type gas circuit breaker, it is necessary to increase the gas pressure to the buffer in order to improve the circuit breaker performance.

For example, the current 550KV gun has a breaking current of 63K.
Even A has been put into practical use. This 550KV-63K
A@'s circuit breaker is constructed with four breaking points, but in order to improve the reliability of the circuit breaker, it is important to reduce the number of breaking points and the number of parts. For this purpose,
Improves breaking capacity per breaking point, 550KV-63
It is necessary to cut KA at two points or at one point.

In order to achieve this improvement in breaking capacity, conventional 16
What has been used in power transmission voltage systems of 8 KV or higher is a so-called buffer type gas circuit breaker, which extinguishes the arc by spraying gas onto it. This has a simple structure of the interrupting part and has excellent insulation and arc extinguishing performance due to the enclosed SFe gas.

In addition, in closed gas-insulated switchyards where all substation equipment is insulated with SFe gas, the insulating gas used allows for coordination of insulation between circuit breakers and other equipment, which also improves efficiency in terms of equipment placement. Because it is good, it is especially often used.

FIGS. 3 and 4 show the structure of a conventionally used buffer type gas circuit breaker. First, in FIG. 3, a fixed electrode 2 and a movable electrode 3 are provided facing each other in a gas tank 1, and an insulating cylinder 4 is provided so as to surround the outside of these fixed electrode 2 and movable electrode 3. Conductors 5 and 6 are connected to the fixed electrode 2 and the movable electrode 3, respectively, and a drive mechanism 7 is connected to the movable electrode 3. In addition,
The movable electrode 3 is attached to the gas tank 1 via a supporting insulating cylinder 10.

Next, details of arc extinguishing of such a buffer type gas circuit breaker will be explained. In FIG. 4, the fixed electrode 2 is hollow and includes a fixed arc contact 8 at the center and a cylindrical fixed current-carrying electrode 9 provided on the outside thereof. On the other hand, the movable electrode 3 connects the buffer cylinder 12 that moves along the outside of the buffer piston 11 with the drive mechanism 7 and the buffer piston 11 fixed on the gas tank 1 side. , buffer piston 1
1.

Roughly speaking, a movable arc electrode 14 that contacts the fixed arc electrode 8 and an insulating nozzle 15 surrounding the movable arc electrode 14 are provided at the tip of the buffer cylinder 12.

In the conventional gas circuit breaker configured as described above, when the operating rod 13 is reciprocated by the drive mechanism 7, the movable electrode 3 performs an opening/closing operation between the movable electrode 3 and the opposing fixed electrode 2, thereby interrupting the current. .

Here, FIG. 4 shows a state in which the interrupting operation is in progress, and in this state, the fixed arc electrode 8 and the movable arc electrode 14
An arc 16 occurs between the two.

When the buffer cylinder 12 moves in the left-right direction due to the shutoff operation and the arc-extinguishing gas is compressed within the buffer 17 formed by the buffer cylinder 12 and the buffer piston 11, this arc-extinguishing gas flow flows through the insulating nozzle. 15 and is blown onto the arc 16 to extinguish it.

By the way, in the buffer type gas circuit breakers mentioned above, as the voltage per breaking point is becoming higher, it is necessary to increase the opening speed in order to improve the arc extinguishing performance. In order to increase the opening speed in the configuration,
The driving force of the drive mechanism had to be increased, which increased the size of the entire device, which not only went against today's demands for miniaturization, but was also uneconomical.

On the other hand, as shown in FIG. 5, the fixed electrode 2 is moved in the opposite direction to the moving direction of the movable electrode 3 without changing the driving force of the drive mechanism, thereby increasing the relative opening speed. There is a motion type buffer type gas circuit breaker.

FIG. 5 shows a double-motion buffer type gas circuit breaker in which a second movable electrode 23, which is disposed opposite to a movable electrode 3 (hereinafter referred to as the first movable electrode), is moved in the opposite direction to the moving direction of the first movable electrode 3. It shows. Note that this figure shows the inserted state.

In this figure, a plurality of insulating rods 24 are arranged around the outer periphery of the buffer cylinder 12 at a constant distance from the buffer cylinder 12.

The insulating rod 24 is connected to the operating rod 13 via a link device 18 provided between the insulating rod 24 and the operating rod 13 at its end on the operating mechanism side. The link device 18 includes a first link rotatably connected to both ends of the link 18a.
．． Second connecting rod 18b.

18c and a link support portion 18d that supports the link 18a.
It is composed of The link 18a is rotatably supported relative to the link support portion 18d about a fulcrum 18e of the link support portion 18d set to a predetermined link ratio. Also, 1st. Each second connecting rod 18d, 18c is
At one end of each, an operating rod 13 and an insulating rod 29
is rotatably connected to. Note that the link support portion 18
d is an insulating tube 19 insulated and fixed to a container (not shown).
is fixed.

On the other hand, a current-carrying cylinder 20 is attached coaxially to the end of the insulating rod 24 opposite to the operating mechanism, and this current-carrying cylinder 20 connects to a current-carrying conductor supported and fixed on the side opposite to the operating mechanism. The energizing portion 21a of 21 is slidably operated.

A second movable arc electrode 22 is provided on the operating mechanism side of the energizing cylinder 20, and constitutes a second movable electrode 23 that performs opening and closing operations with the first movable electrode 3. In addition, in the closed state shown in FIG. 5, the first movable electrode 3 and the second movable arc electrode 2
2 is in contact with.

In the gas circuit breaker configured as described above, first, the fifth
If you operate the operating mechanism (not shown) in the input state shown in the figure,
The operating rod 13 is driven at a predetermined speed in the direction of the operating mechanism (rightward in the figure), and the first movable electrode 3 is fixed to the tip thereof.
moves to the right, and a blocking operation occurs between it and the second movable electrode 23. - On the other hand, along with the movement of this operating rod 13,
A force is also applied in the same direction to the first connecting rod 18b connected to the operating rod 13, and the force is applied so as to move one end of the link 18a connected to the first connecting rod 18a to the right in the figure. In this case, since the fulcrum 18e of the link 18a is fixed, the force applied to one end of the link 18a is
A moment force is generated that rotates the link 18a counterclockwise about the fulcrum 18e, and the link 18a rotates in the same direction.

Then, the other end of the link 18a rotates to the left in the figure, so the second connecting rod 18C connected to the rotating portion moves to the left, and the insulating rod 24 connected to it moves to the left. . Therefore, the second movable electrode 23 fixed to the insulating rod 24 moves to the left, and the first movable arc electrode 14 and the second movable arc electrode 22 are separated, shifting to an open state as shown in FIG. do. That is, in accordance with the operation of the operating rod 13, both the first movable arc electrode 14 and the second movable arc electrode 22 move in the respective interrupting operation directions.

Further, the closing operation is performed in the same manner by driving the operating rod 13 in the opposite direction to the above-described closing operation. That is,
When the operating rod 13 is driven to the left at a predetermined speed in the disconnected state shown in FIG. 6, the first movable electrode 3 fixed thereto moves to the left, which is the direction of contact with the second movable electrode 23. On the other hand, the link 18 is connected via the first connecting rod 18b.
a rotates clockwise. As a result, the second connecting rod 18
G moves to the right, and the insulating rod 24 and the second movable electrode 23 move to the right, which is the direction of contact with the first movable electrode 3.

(Problems to be Solved by the Invention) By the way, in the above-described high voltage circuit breaker that operates opposing electrodes, when opening and closing the circuit breaker, the insulating rod 24 connected to the operating rod 13 is connected to the operating rod 13. Move to the other side. When the interrupting operation is performed, it will be in a stationary state when the interrupting operation is completed, but the inertia force due to the weight of the second movable electrode 23 acts, and the insulating rod 24 and the link device 1
A tensile force is applied to 8. As a result, excessive stress is applied to the joint portion and insulator portion of the insulating rod 24.
In a circuit breaker that requires opening and closing operations many times, there is a risk that the insulating rod 24 and the link operation 18 will be destroyed.

[Object of the Invention] The object of the present invention has been made to eliminate the drawbacks of the prior art as described above. It is an object of the present invention to provide a buffer type gas circuit breaker which is durable and reliable without applying tensile force.

[Structure of the Invention] (Means for Solving the Problems) The buffer type gas circuit breaker of the present invention includes a tank device and a second
The connecting portion between the movable electrode and the insulating rod is disposed in a direction opposite to the drive device rather than the current-carrying portion disposed in the opposite direction to the drive device; A damper device is provided approximately halfway between the closing position and the fully open position of the second movable electrode, and when the flange portion of the first movable electrode enters the damper device so that a braking force is applied from the middle of the contact opening, the damper device enters the damper device. A certain gas is compressed into the flange, and a braking force is applied in the opposite direction to the direction of movement.

(Function) As described above, in the present invention, the second movable electrode is damped by the gas in the damper device before the interruption operation is completed, and when the interruption operation is completed, the second movable electrode 23
The inertial force due to its own weight acts almost exclusively on the insulating rod and link operation, and the insulating rod and link device are less likely to be destroyed even if they are operated many times.

(Example) Next, we will explain one example of the buffer type gas circuit breaker of the present invention as a first example.
This will be explained using figures.

Note that the same parts as those in the prior art are given the same reference numerals and the description thereof will be omitted.

Configuration of this embodiment* In FIG.
1 are coaxially arranged and supported by a fixed part (not shown). This current-carrying conductor 31 is provided with a flange portion 32 protruding inwardly at its tip and a damper device 33 at a position where the opening of the insulating rod 24 is completed. Flange part 32
A through hole 32a is bored at a position corresponding to the insulating rod 24, and the insulating rod 2 is inserted through this through hole 32a.
4 is slidably attached, and furthermore, a current-carrying part 34 is arranged at the tip of the flange part. On the other hand, the damper device 33 is formed in a cross-sectional shape with an opening on the insulating rod 24 side, and a through hole is formed in the vertical side surface of the damper device 33. Device 3
3 is supported, and the outer circumferential surface of the damper device 33 is disposed outside the current-carrying conductor 31, and the inner circumferential surface thereof is disposed inside the current-carrying conductor 31.

Furthermore, a flange portion 35 is provided at the tip of the insulating rod 24.
A second movable shield 36 supported by is mounted between the insulating rod 24 and the second movable arc electrode 22 . The current-carrying portion 34 of the current-carrying conductor 31 is placed in contact with the outer surface of the second movable shield 36 .

Note that the distance between the flange portion 35 on which the second movable shield 36 is supported and the flange portion 32 on which the current-carrying portion 33 is supported must exceed the entire stroke of the insulating rod 24. Further, the width of the vertical side surface of the damper device 33 is set to be slightly wider than the width of the flange portion 35 on which the second movable shield 36 is supported.

Operation of this embodiment* As shown in Fig. 1, the operation of the buffer type gas circuit breaker of this embodiment configured as described above is as follows. The process up to the middle is the same as before. Entering the final stage in which the insulating rod 24 is moved leftward in the figure, the second movable shield 36 attached to a flange 35 fixed to the tip of the insulating rod 24 is moved leftward in the figure. Then, the current-carrying portion 33 slides on the cylindrical outer surface of the second movable shield 36 . Furthermore, during the movement of the insulating rod 24 in the fixing direction as described above, the flange 35 is inserted into the damper device 33 and moved to the opening completion position. The flange 35 is the damper device 3
3, the gas in the space within the damper device 33 begins to be compressed by the flange surface 35. As it moves roughly, the rate at which the gas is compressed increases, so a force that resists the compression force of the gas in the damper device 33 acts on the surface of the flange 35, and the flange 35 is braked and attached to the flange 35. The second movable electrode 36 that has been moved is also braked at the same time. Due to the inertial force generated when the second movable electrode 36 is stationary, the tensile force of the insulating rod 24 is reduced. Note that these series of operations are the shutoff operation, but the closing operation is the opposite of this operation.
The explanation will be omitted.

Effects of this embodiment* As described above, in the buffer type gas circuit breaker of this embodiment, a flange 35 is provided at the tip of the insulating rod 24, and the second movable electrode is attached to this flange 35. Since the damper device 33 is provided at the opening completion position of the insulating rod 24 corresponding to the flange 35, when the flange portion 35 is inserted into the damper device 33 from the middle of the contact opening, the gas inside the damper device is removed. Due to the pressure, the flange portion 35
Since a braking force is applied to the second movable electrode in the opposite direction to the moving direction, at the time when the interrupting operation is completed, a braking force is applied to the second movable electrode.
It no longer stops suddenly.

Therefore, even if the opening and closing operations are performed many times, the insulating rod 24
Insulating rod 2 is no longer subjected to excessive stress that would cause it to break.
4 and the durability of the link device 18 can be obtained.

[Effects of the Invention] As described above, according to the present invention, a damper device is provided on the side opposite to the drive device of the second movable electrode attached to the insulating rod, and the flange portion provided on the first movable electrode is connected to the damper device. The gas inside is compressed and the control operation force is applied in the opposite direction to the direction of movement, so even if the opening and closing operations are performed multiple times during the shutoff operation, excessive tensile force will not be applied to the insulating rod and linkage. Therefore, it is possible to provide a buffer type gas circuit breaker that is durable and reliable.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views showing one embodiment of the buffer type gas circuit breaker of the present invention, which operates to disconnect from a warm state, and Figure 3 is a conventional gas circuit breaker housing a buffer type arc extinguisher. Figure 4 is a cross-sectional view showing a buffer type arc extinguishing chamber, Figure 5 is a cross-sectional view showing a double-motion type buffer type gas circuit breaker in the closed state, Figure 6 is a double-motion type buffer type gas circuit breaker. FIG. 3 is a cross-sectional view showing the cut-off state of the circuit breaker. DESCRIPTION OF SYMBOLS 1... Gas tank, 2... Fixed electrode, 3... Movable electrode (first movable electrode), 4... Insulating tube, 5, 6...
Conductor, 7... Drive mechanism, 8... Fixed arc electrode, 9
...Fixed current-carrying electrode, 10...Support insulating tube, 11...
・Buff 1 piston, 12...Pack cylinder, 1
3... Operating rod, 14... Movable arc electrode, 15
... insulation nozzle, 16 ... arc, 17 ... buffer to, 18 ... link device, 18a ... link,
18b...first connecting rod, 18C...second connecting rod, 1
8d... Link support part, 18e... Fulcrum, 19...
- Insulating tube, 20... Current carrying cylinder, 21... Current carrying conductor, 21a... Current carrying part, 22... Second movable arc electrode, 23... Second movable electrode, 24... Insulation rod, 3
1... Current conductor, 32... Flange portion, 32a.
...Through hole, 33... Damper device, 34... Current carrying part, 35... Flange part, 36... Second movable shield.

Claims (2)

[Claims] (1) In a container filled with arc-extinguishing gas, there is a first
, a second movable electrode is disposed facing each other, the first movable electrode and a buffer cylinder are fixed to one end of an operating rod connected to a drive device, and a buffer piston that is slidable within the buffer cylinder and the buffer cylinder is provided. The arc-extinguishing gas in the buffer cylinder is compressed, and this compressed gas is ejected as a high-speed gas flow from an insulated nozzle fixed to the buffer cylinder, and is blown onto the arc generated between the opposing arc electrodes to extinguish it. A buffer configured by connecting a link device that reverses the direction of the driving force and has a support point to the driving device side of the operating rod, and connecting this link device and the second movable electrode with an insulating rod. In the type gas circuit breaker, the link device and the connecting portion between the second movable electrode and the insulating rod are arranged in a direction opposite to the driving device, rather than the current-carrying portion which is arranged in the opposite direction to the driving device. 1. A buffer type gas circuit breaker characterized in that a damper device is provided approximately halfway between the closing position and the fully open position of the second movable electrode. (2) A patent claim characterized in that a flange fixed to the second movable electrode slides inside the damper device from an intermediate point between a closing position and a fully open position, and a space is formed by the flange and the damper device. The buffer type gas circuit breaker according to item 1.