JPS6174224A - 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] [Industrial Application Field] The present invention relates to a buffer type gas circuit breaker, and more specifically, it relates to fixed and movable arc contacts coaxially arranged and their The present invention relates to a buffer type gas circuit breaker having an insulating cylinder that surrounds a contact and is arranged horizontally.

[Conventional technology]

Conventionally, in switchgear devices that have contacts that can be connected and disconnected in response to a shutdown command, energization is performed by sliding and contacting metal contacts, one of which is fixed and the other movable, relative to each other. . In this type of opening/closing equipment, metal powder is generated on the sliding parts due to multiple opening/closing operations, and this metal powder can cause
Especially in high voltage switching equipment, insulation performance tends to deteriorate.

In a buffer type gas circuit breaker in which the arc extinguishing chamber is surrounded by a cylindrical insulating tube and the insulating tube provides insulation between poles, when the axial direction of the insulating tube is arranged horizontally,
Metal powder generated at the sliding part falls and adheres to the inner surface of the insulating cylinder, significantly reducing the insulation performance between the poles, so it is difficult to adopt the above configuration, especially in high voltage products. As a countermeasure, the insulating cylindrical wall at the bottom of the sliding contact part may be cut out, or the movable side and the fixed side of the contact may be supported with separate insulators to provide an insulator between the electrodes. This avoids deterioration in interelectrode insulation due to the generation of metal powder.

[Problem that the invention seeks to solve]

In conventional buffer type gas circuit breakers like the one above.

If a structure in which a part of the insulating tube is cut out is used, there are problems in that it becomes expensive due to manufacturing difficulties and the strength decreases. Moreover, if the structure is such that the movable side and fixed side of the contact are supported by separate insulators.

Another problem was that the increase in the number of parts made it expensive.

The present invention has been made in order to solve these problems, and aims to provide a t-buffer type gas circuit breaker that has excellent mechanical strength, is easy to manufacture, and is inexpensive.

[Means for solving problems]

The buffer type gas circuit breaker according to the present invention has seven buff chambers, each of which is a conduit, which blows out high-pressure gas almost directly below the space between the contacts.

[Effect]

In this invention, metal powder that has fallen from the contact is removed by high-pressure gas blown out from the conduit.

〔Example〕

1 and 2 show an embodiment of the present invention, in which a fixed arc contact 1 and a movable arc contact ≠ form a pair on the same axis, and the fixed main contact 1 and the movable Main contactors are installed side by side. These two types of contacts make sliding contact between opposite sides to turn on and cut off electricity. By the breaking operation of the contact, the gas compressed in the buffer chamber formed by the piston 6 and the cylinder 7 is blown onto the arc 9 generated by the insulating nozzle 3, and the current is cut off.

An insulating tube lO supporting the contact is installed horizontally and concentrically with the contact, and a fixed side support plate // and a movable side support plate l are coupled to both ends of the insulating tube io, respectively.

Reference numeral 13 denotes a grounded tank that accommodates the insulating cylinder 10 coaxially.

The explanation up to this point is no different from the conventional device, but in this invention, as shown in the figure, the buffer chamber g
A conduit l≠ leading to is arranged.

One end of the piston AlC of the buffer chamber g is connected to this conduit/hiro, which leads to the buffer chamber t, and behind the piston O/
t O' is bent to overflow the lower part of the inner surface of the insulating cylinder 10 and open in a substantially horizontal direction almost directly below the sliding area between the movable arc contact chip and the fixed arc contact l. A blower outlet /j- is formed in the lower part of the fixed support plate //, facing the opening of the pipe line /Q.

With the above configuration, as the contactor shuts off, high-pressure gas from the buffer 7 chamber t is blown to the arc de as shown by the arrow 16, and is also blown by the pipe line /'1 to the arrow
As shown in 7, metal powder/g generated by the sliding of each l pair of arc contacts/, II:16 and main contactor 2. ,
Objects that have fallen on the lower part of the inner surface of the insulating tube 10 are moved toward the air outlet 15, and the insulating tube i is removed.

exclude to the outside.

[Effects of the Invention] As explained above, this invention sprays high-pressure gas onto the lower part of the inner surface of the insulating cylinder, thereby preventing the accumulation of fallen metal powder caused by the sliding of the contacts. The insulation performance between the electrodes can be maintained at the initial state, and no problem will occur even if the gas circuit breaker is installed so that the insulation cylinder is horizontal.

Therefore, the structure for supporting the contact by the insulating cylinder is simple and inexpensive, and has excellent mechanical strength.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional view of one embodiment of the present invention, and Figure 2 is a partial side view thereof. l...Fixed arc contact, ψ...Movable arc contact, 6
・・Pist/・・・Cylinder, t・・Buffer chamber, 1
0...Insulating cylinder, 14t...Pipeline, /!・Air outlet. In each figure, the same reference numerals indicate the same or similar parts.

Claims (2)

[Claims] (1) A fixed arc contact element and a movable arc contact element that slide apart due to a breaking operation, a buffer chamber consisting of a cylinder and a piston that operate together with the movable arc contact element, and the fixed arc contact element and the movable arc contact element. an insulating tube that accommodates and supports a contactor and a buffer section and whose axis is installed horizontally, one end of which is connected to the buffer chamber, and the other end of which is opened at the lower part of the inner surface of the insulating tube, almost directly below the contact sliding area. A buffer type gas circuit breaker equipped with a pipe line. (2) A buffer-type gas cutoff according to claim 1, comprising a support plate coupled to an end of an insulating cylinder and an outlet formed in the support plate opposite to the opening of the conduit. vessel.