Vacuum arc-extinguishing chamber component with internal isolation and vacuum circuit breaker

Abstract

The invention discloses a vacuum arc-extinguishing chamber component with internal isolation. The vacuum arc-extinguishing chamber component comprises a vacuum arc-extinguishing chamber, an isolationassembly, a linkage assembly and a pull rod assembly, wherein the vacuum arc-extinguishing chamber is connected with the isolation assembly in series; the pull rod assembly is connected with an operation mechanism; when the pull rod assembly moves, the linkage assembly drives the vacuum arc-extinguishing chamber and the isolation assembly to move in sequence; during opening, the vacuum arc-extinguishing chamber and the isolation assembly carry out opening in sequence; and during closing, the isolation assembly and the vacuum arc-extinguishing chamber carry out closing in sequence. The vacuum arc-extinguishing chamber component has the advantages of being compact in structure, convenient to operate, safe and reliable.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution, in particular to a pole-mounted vacuum circuit breaker. Background technique [0002] In order to improve the reliability of distribution network power supply and strengthen the safety management of distribution network, the State Grid Corporation of China began to vigorously promote the primary and secondary integration projects of power distribution equipment in 2016. Among them, the vacuum circuit breaker on the column is the main equipment in the primary circuit. However, since the breaking distance of the vacuum interrupter is generally only 8 to 10 mm, the distance between the breaking points is relatively small. In the opening state, when a high overvoltage or lightning impact occurs on the power supply line, the vacuum breaking point is likely to be hit. Wear, so that the other side of the switch is charged again, causing an accident. On trunk lines, this unr...

AI Technical Summary

Problems solved by technology

However, most of the mainstream pole-mounted vacuum circuit breakers currently on the market are external isolation blades.

This kind of external isolating knife needs to be operated separately, and an interlocking device with the circuit breaker needs to be added. At the same time, the external isolating knife is greatly affected by the external environment, and its contact knife is easily oxidized, resulting in hidden dangers such as increased contact resistance and heat generation.

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