Double-coil contact structure of vacuum arc-extinguishing chamber in mechanical high-voltage DC circuit breaker

Abstract

The invention relates to a double-coil contact structure of a vacuum arc-extinguishing chamber in a mechanical high-voltage DC circuit breaker, which is composed of two identical contact structures, and is characterized in that the conductive rod is a T-shaped cylindrical rod, the diameter of a large-end circular surface of the conductive rod is the same as the outer diameter of a circular coil and a circular contact, the large-end circular surface of the conductive rod, the circular coil and the circular contact are stacked and connected in turn, the two connecting surfaces are in plane support by using insulating ring gaskets made of polytetrafluoroethylene or an insulating material with higher strength except for the protruding parts, electric arc is generated between the two contacts when the contacts are separated, and the electric arc is distributed on the whole annular surface of the circular contact, so that the current is enabled to flow for a circle along the circular coil and then flow into the circular contact along a connecting conductor, and the current generates a large longitudinal magnetic field between the contacts when flowing along the circular coil. In addition, the structure is ensured not to be extruded and deformed, the structure is simple, the electric life of the contacts is longer, the electric arc is lengthened when being pulled into the coil, and the electric arc is enabled to be extinguished more easily.

Description

technical field [0001] The invention relates to a high-voltage direct current circuit breaker, in particular to a double-coil contact structure of a vacuum interrupter in a mechanical high-voltage direct current circuit breaker. Background technique [0002] The working principle of mechanical high voltage DC circuit breaker is as follows: figure 1 shown. It includes three branches: the first branch is composed of a high-voltage vacuum circuit breaker, the second branch is a current transfer branch, which is a branch where a charging capacitor and an inductor are connected in series to form a high-frequency current; the third branch is a lightning arrester branch. Arcing starts in the high-voltage vacuum circuit breaker after branch one is opened, and the IGCT switch of branch two is quickly closed (generally, the time difference is milliseconds), and the high-frequency current is rushed into branch one, so that the high-voltage vacuum circuit breaker flows What is more is...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem that the magnetic field of the vacuum interrupter under high frequency in the prior art is difficult to improve, and proposes a double-coil contact structure of the vacuum interrupter in the mechanical high-voltage DC circuit breaker, so that the contact structure can be In the case of high frequency, a large magnetic field is generated, which can help to extinguish the vacuum arc generated by high frequency current

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