An online monitoring device for the vacuum degree of the interrupter chamber of a vacuum circuit breaker

Abstract

The invention discloses an online monitoring device for the vacuum degree of an arc extinguishing chamber of a vacuum circuit breaker. The online monitoring device comprises a fixing seat and a pressure detection component, wherein the fixing seat is fixedly connected with an arc extinguishing chamber shell; a threaded through hole is formed in the fixing seat; the part of the arc extinguishing chamber shell opposite to the threaded through hole of the fixing seat is a thin-wall part with thickness of 0.1-1.0mm; the pressure detection component comprises a component shell, a pressure sensor and a signal processing and communication module; the component shell consists of a needle part, a connection part and an operation part; an axially penetrating needle hole is formed in the needle part; the connection part is a barrel body; a through hole communicated with the needle hole of the needle part is formed at the bottom of the connection part; an external thread is arranged on the outer wall of the connection part; the pressure sensor is fixed at the bottom of the connection part; the outer wall of the operation part is of a polygonal structure; and the signal processing and communication module is fixed inside the operation part and electrically connected with the pressure sensor. The device disclosed by the invention is simple in structure and convenient to use and can realize online monitoring of the vacuum degree of the arc extinguishing chamber.

Description

technical field [0001] The invention relates to an online monitoring device for the vacuum degree of an arc extinguishing chamber of a vacuum circuit breaker. Background technique [0002] Vacuum circuit breakers have been widely used in high, medium and low voltage fields. The vacuum degree reduction or failure of the vacuum interrupter due to leakage is the main cause of the current vacuum circuit breaker accidents, and the detection of the vacuum degree or leakage of the vacuum interrupter has become one of the important contents of the condition maintenance of most vacuum circuit breakers. In fact, the vacuum degree of the vacuum interrupter is also one of the main factors that determine the breaking performance of the vacuum interrupter. In order to achieve current breaking and arc extinguishing, the pressure in the vacuum interrupter should not be higher than 1.33×10 -2 Pa, the reduction of the vacuum degree will directly affect the breaking performance of the vacuum ...

AI Technical Summary

Problems solved by technology

Off-line monitoring requires power-off to detect the system, so it will have a certain impact on power users; after power-off, the state in the vacuum interrupter chamber is inconsistent with the operating state, thus affecting the accuracy of judgment

How to realize on-line monitoring has always been a difficult problem, because the production of vacuum interrupters requires welding, sealing and vacuuming of materials at a high temperature of about 800 degrees, so the general built-in sensor cannot withstand such an environment, so it cannot be pre-implanted. Gas pressure measurement to reflect its internal vacuum or leaks

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