JPS61227333A - Buffer type gas 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 buffer type gas circuit breaker with an improved arrangement of current-carrying contacts.

[Technical background of the invention and its problems]

In recent years, circuit breakers used in substations, etc. have an arc-extinguishing medium of 8F.
Buffer-type gas circuit breakers that use insulating gas such as gas are becoming mainstream. This conventional buffer type gas circuit breaker has a configuration as shown in FIG. That is, in the tank 1, along with an insulating gas (the two-way disconnection section 2 is housed almost coaxially,
has been done. This interrupting part 2 has a fixed electrode part 4 inside an insulating cylinder 3.
and a movable electrode section 5 are arranged facing each other so as to be able to freely approach and separate. The fixed electrode part 4 includes a fixed arc contact 6 and a fixed arc contact 6.
It consists of a fixed current-carrying contact 7 provided concentrically on the outside of the On the other hand, the movable electrode part 5 is composed of a movable arc contact 8 that approaches and separates from the fixed arc contact 6, and a fixed current-carrying contact 7 (two movable current-carrying contacts 9 that connect and separate from each other). ，
9 is fixed to the Pap cylinder 10. The buffer cylinder 10 also has a buffer piston 1 sliding therein.
Together with 1, it forms a buffer room school. The buffer cylinder 10 is connected to an operating device 15 provided at the bottom of the tank 1 via an operating rod 13 and an insulating rod 14.

Further, the buffer piston U is fixed to the end of the insulating cylinder 3, and this insulating cylinder 3 is fixed to the lower part of the tank 1 via the flange 16 and the insulating support cylinder 17.
Openings la and lb are numbered on the sides of the tank l near both ends, and these openings is and lb are connected to conductors 18m and 18b, respectively.
The fixed electrode part 4 side and the movable electrode part 5 side C of the insulating cylinder 3 are connected through
;It is connected.

Next, the operation of this buffer type gas circuit breaker will be explained. At the time of closing, the movable arc contact 8 is engaged with the fixed arc contact 6, and the fixed current-carrying contact 7 (the two movable current-carrying contacts 9 are engaged). The movable electrode part 5 and the buffer cylinder 10 move toward the side opposite to the fixed electrode part 4. Accompanying this, the two-way electrical contacts 7 and 9 are separated by 5 m, and then both the arc contacts 6 and 8 are separated, and both arcs An arc is generated between the contacts 6 and 8. This arc is extinguished by moving the buffer cylinder 10 (secondarily, by spraying insulating gas compressed and pressurized in the buffer chamber 12).

However, in such a configuration, since the interrupting part 2 is surrounded by the insulating cylinder 3 that is fixedly supported, there is a possibility that arc energy remains in the insulating cylinder 3.

In particular, since no insulating gas is sprayed between the two-way electrical contacts 7 and 9, there is a risk that the insulating gas away from the arc will be released during this time and the withstand voltage characteristics will drop significantly.

[Purpose of the invention]

The present invention was made in order to eliminate the above-mentioned drawbacks, and an object of the present invention is to provide a buffer type gas circuit breaker with improved withstand voltage characteristics between current-carrying contacts.

[Summary of the invention]

In order to achieve the above object, the present invention (second aspect) includes arranging an arc contact portion including a fixed arc contact and a movable arc contact inside an insulating cylinder, and disposing a fixed current-carrying contact and a movable current-carrying contact outside the insulating cylinder. A current-carrying contact portion with a contactor is arranged to prevent the insulating gas from directly touching the current-carrying contact portion after the arc is extinguished.

[Embodiments of the invention]

A first embodiment of the buffer type gas circuit breaker according to the present invention will be described below.
This will be explained using a diagram. Inside the grounded cylindrical tank 19 (
1.8F, a cutoff part 20 is housed together with an insulating gas such as gas.This cutoff part 20 is equipped with an arc contact part 21 and a current carrying contact part 22.
has a fixed arc contact piece fixed to the center of one end of an insulating cylinder concentrically arranged in the axial center of the tank 19. One end of the flange 5 is fixed to the other end of the insulating tube,
Furthermore, C=, the other end of this flange 25 has an insulating support cylinder 26.
to fix. This insulating support tube 26 is fixed to the opposite end C of the tank 19 to the fixed arc contact 24 side. Further, the flange F 25 C fixes a buffer piston 27 located within the insulating cylinder n, and a buffer cylinder 4 is disposed slidably outside the buffer piston 27. The buffer piston 27 and the buffer cylinder 4 form a buffer chamber 29 that produces high-pressure insulating gas.

An operating rod 30 that is inserted through the buffer cylinder 4, the flange 5, and the insulating support cylinder 26 is fixed on the side opposite to the fixed arc contact 24 of the buffer cylinder 4 and approximately in the center. The tank 19 lower part (bifurcated) is fixed to the operating device 32 via the insulating rod 31. On the other hand, the fixed arc contact side of the buffer cylinder (
The second fixes the fixed arc contact U and the movable arc contact 33 that moves toward and away from the tank 19 in the axial direction. Further, on the buffer cylinder portion and on the outside of the movable arc contact 24, an insulating nozzle that surrounds the movable arc contact 24 and extends toward the fixed arc contact 24 is fixed via a nozzle holder.

This insulating nozzle serves as a guide for the flow of insulating gas discharged from the buffer chamber 29.

Furthermore, the current-carrying contact portion 22 is composed of two components as shown below. That is, the outer part of the flange 25 includes a fixed current-carrying contact 36 and a movable current-carrying contact that can be freely moved toward and away from the tank 9 in the axial direction. 36 and a movable current-carrying contact 37 are arranged to face each other.

This fixed current-carrying contact 36 is fixed to the end of the insulating tube n to which the fixed arc contact U is fixed, and this insulating tube n and the tank 19
The movable arc contact element is pushed through between the insulating cylinder blades and fixed to the current-carrying conductor 38 extending near the end on the side of the movable arc contact element.

In other words, the energizing rod is connected to the flange 25 (two contacts).
Instead, they surround Frank 5. As a result, the fixed arc contact U and the fixed current-carrying contact 36 are normally electrically connected. On the other hand, the movable current-carrying contact 37 is fixed to the operating rod 30 so that it can be inserted into the flange 6.

In addition, openings 19m and 19b for connection to other devices are provided near the current-carrying contact portion 22 and at opposing positions on the side surface of the tank 19. 39m, which has one end connected to the movable current-carrying contact 36 and has a flexible portion in part, is connected to this one opening 19a.

Furthermore, one end of the other opening 19b has a current-carrying rod 3.
Connect the conductor 39b connected to 8.

Next, the operation of the configuration of this embodiment will be explained.

When the buffer type gas circuit breaker is turned on, the operating device 32
Due to this operation, the insulating rod 31 is driven upward (in the figure). Accompanying this, the operating rod 30 moves the pack-a-cylinder toward the fixed arc contactor 24. Therefore, the buffer chamber 29 has a maximum volume. , stores a large amount of insulating gas inside.The movable arc contact 33 is in contact with the fixed arc contact 24&:, and the movable current-carrying contact 37 is in contact with the fixed current-carrying contact 36ζ. At this time, most of the current flows between the conductor 39a1, the movable current-carrying contact 37, the fixed current-carrying contact A, the current-carrying rod 38, and the conductor 39b. The current flows between the cylinder 4, the movable arc contact 24, the fixed arc contact 24, the current-carrying rod Yu, and the conductor 39b.

Now, when a shutdown command is issued to this buffer type gas circuit breaker,
The operating device 32 operates and the insulating rod 31 is driven downward in the figure, that is, toward the operating device 32 side. Also; the accompanying operating rod 30 moves the pack cylinder 28 away from the identification arc contact side. Then, first, the movable current-carrying contact 37 separates from the fixed current-carrying contact 36.

At this time, the entire current flows between both arc contacts u and 33.

Furthermore, as the breaking operation progresses, the movable arc contactor is separated from the fixed arc contactor U, and both arc contacts U, 3
One near arc occurs for three hours. Also, as the operating rod 30 moves, the buffer cylinder 4 moves away from the fixed arc contact 2.
Move to the 4th side. This reduces the volume of the buffer chamber 29 and increases the pressure of the insulating gas inside. This pressurized insulating gas is blown onto the arc using the insulating nozzle as a guide, extinguishing the arc and completing the interruption.

In this embodiment, the fixed current-carrying contact 36 and the movable current-carrying contact 37 are provided outside the insulating tube n, and the fixed arc contact U and the movable arc contact are straddled inside the insulating tube n. Further, the two-way electrical contacts 36 and 37 are located upstream of the flow of insulating gas. Therefore.

The insulating gas with reduced dielectric strength exposed to the arc generated between both arcing contacts u and 33 directly connects both current-carrying contacts 3
There is no touching between 6 and 37. This improves the dielectric strength and reliability of the buffer type gas circuit breaker. This allows the device to be downsized. Furthermore, since the two-way electric contacts 36 and 37 are not arranged to surround the two arc contacts U and 33, the arc contact portion 21 and the entire buffer type gas circuit breaker can be downsized. Also, when energizing, 6 immediately from energizing contacts 36 and 37: respective openings 19a and 19b.
Since it is connected to the energizing resistor, the energizing path can be significantly shortened, and the temperature rise due to the energizing resistance can be suppressed.

In this embodiment, only a single-phase buffer type gas circuit breaker has been described, but it can also be applied to a three-phase batch type buffer type gas circuit breaker, and similar effects can be obtained. Further, the positions of the openings 19a and 19b can be arbitrarily changed depending on the positional relationship with other devices. Further 1: The connection between the conductor 39m and the movable current-carrying contact 37 may be such that the conductor 39m slides on the movable current-carrying contact 37.

〔Effect of the invention〕

As explained above, in the present invention, an arc contact part is arranged inside the insulating cylinder, and two current-carrying contact parts are arranged outside the insulating cylinder, so that the insulating gas whose dielectric strength has decreased after the arc is extinguished can be brought into contact with the current. Since the parts are not touched directly, it is possible to provide a buffer type gas circuit breaker with improved withstand voltage characteristics.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of a buffer type gas circuit breaker showing an embodiment of the present invention, and FIG. 2 is a partial sectional view of a conventional buffer type gas circuit breaker. 19...tank, 19 m * 19
b ”・Opening, 20...Blocking part, 21
... Arc contact part, 22 ... Current-carrying contact part, Field ... Insulating cylinder, 24 ... Fixed arc contact, 25 ...
・Flange, 26...Insulation support cylinder, n...Buffer piston, 4...Buffer silling, 4...
Buffer chamber, 30... Operating rod, 31...
insulation rod. 32 - Operating device, O... Movable arc contact, U... Insulated nozzle, 35 - Nozzle holder, A...
Fixed current-carrying contact, n--movable current-carrying contact, ah... current-carrying rod, 39m, 39b--conductor. Agent Patent Attorney Noriyuki Chika (#1st Lambda person) Figure 1

Claims (1)

[Claims] (1) An arc contact part in a tank filled with insulating gas,
A current-carrying contact part that opens prior to the arc contact part at the time of interruption is housed, and the arc contact part includes a fixed arc electrode fixed in an insulating cylinder, and a buffer cylinder that can freely move toward and away from the fixed arc electrode in the axial direction of the tank. A movable arc contact is disposed opposite to the movable arc contact, and a buffer piston is inserted into the buffer cylinder and forms a buffer chamber together with the buffer cylinder. An operating rod that passes through the piston and connects one end to an operating device is fixed, while the current-carrying contact portion is connected to a fixed current-carrying contact disposed near the side opposite to the fixed arc contact of the insulating cylinder and the operating rod. A movable current-carrying contact is provided opposite to the fixed current-carrying contact on a side opposite to the fixed arc contact so as to be able to come into contact with and separate from the fixed current-carrying contact, and the movable current-carrying contact is arranged opposite to the fixed current-carrying contact on the side opposite to the fixed arc contact, and the movable current-carrying contact is arranged to face the fixed current-carrying contact and move away from the fixed current-carrying contact. A buffer type gas circuit breaker characterized in that an insulating gas compressed and pressurized in a buffer chamber is sprayed from a movable arc contact side to a fixed arc contact side to extinguish the arc.