Double-coil contact structure of vacuum interrupter in mechanical HVDC circuit breaker

Abstract

The invention relates to a double-coil contact structure of a vacuum interrupter in a mechanical high-voltage DC circuit breaker. It is composed of two completely identical contact structures. The outer diameters of the ring coil and the ring contact are the same. The round surface of the large head of the conductive rod, the ring coil and the ring contact are stacked and connected in sequence. Except for the raised part, the rest of the two connecting surfaces are all made of polytetrafluoroethylene. Or an insulating ring gasket made of a higher-strength insulating material is supported on a plane. When the contacts are separated, an arc is generated between the two contacts. The arc is distributed on the entire ring surface of the ring contact, so that the current flows along the ring coil for a circle. Then it flows into the ring contacts along the connecting conductor. When the current flows along the ring coil, a large longitudinal magnetic field is generated between the contacts, and the structure is guaranteed not to be squeezed and deformed. The structure is simple and the electrical life of the contacts is longer. , when the arc is pulled inside the coil, the arc is elongated, making it easier to extinguish the arc.

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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