Compact type manual zero-crossing high-voltage direct-current circuit breaker and an on-off method thereof

Abstract

The invention discloses a compact type manual zero-crossing high-voltage direct-current circuit breaker and an on-off method thereof. The circuit breaker comprises an oscillation branch circuit and adouble-station linkage type vacuum conversion switch, wherein the oscillation branch circuit is composed of a converter capacitor and a converter inductance coil in series, the double-station linkagetype vacuum transfer switch is provided with a double-station linkage type vacuum arc-extinguishing chamber structure. The double-station linkage type vacuum conversion switch is provided with a double-station linkage type vacuum arc-extinguishing chamber structure. The invention is advantageous in that through the double-station linkage type vacuum conversion switch having the double-station linkage type vacuum arc-extinguishing chamber structure, the main loop contact opening and the reverse current input are synchronously realized in a vacuum arc-extinguishing chamber. The problems that inthe prior art, a trigger switch used for reverse current input is complex in control, multiple in additional lines and low in reliability are solved. The size of the direct-current circuit breaker equipment can be reduced, the control process is simplified, and the working reliability of equipment is improved.

Description

technical field [0001] The invention relates to a power system circuit breaker, in particular to a compact artificial zero-crossing high-voltage direct current circuit breaker and a breaking method thereof. Background technique [0002] Flexible DC transmission technology is an effective way to build a flexible, strong and efficient power grid and make full use of renewable energy, representing the future development direction of DC transmission. When a short-circuit fault occurs on the DC side of the flexible DC grid, the impedance of the DC side is small, and the capacitor on the DC side of the converter is directly discharged through the short-circuit point. Scale AC grid. At the same time, when a fault occurs on the DC side of the system, even if the insulated gate bipolar transistor (IGBT) inside the converter is immediately shut off through the self-protection function, due to the existence of the freewheeling diode, an uncontrolled rectification The bridge still can...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the shortcomings of the existing methods, the present invention provides a compact manual zero-crossing high-voltage DC circuit breaker and its breaking method. The present invention uses a double-station linkage vacuum transfer switch with a double-station linkage vacuum interrupter structure. , the main circuit contact opening and reverse current input are realized synchronously in a vacuum interrupter, aiming to solve the problems of complex control, many additional lines and low reliability of the trigger switch used for reverse current input in the prior art

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