High-voltage circuit breaker secondary circuit

Abstract

The invention provides a high-voltage circuit breaker secondary circuit. The synchronization problem between different poles and the same poles after two double-break circuit breakers are connected inseries can be solved, and functions of secondary control circuit anti-tripping and non-full-phase protection are achieved. The high-voltage circuit breaker secondary circuit includes an open circuit,a closed circuit, an anti-tripping protection circuit and a non-full-phase protection circuit. The open circuit includes parallel branches formed by A, B and C phase opening solenoid branches and being in series connection, a low oil pressure opening blocking auxiliary relay normally-closed contact and an SF6 low pressure gas blocking auxiliary relay normally-closed contact; the closed circuit includes a parallel branches formed by A, B and C phase closing solenoid branches and being in series connection, a low oil pressure closing blocking auxiliary relay normally-closed contact and an SF6 low pressure gas blocking auxiliary relay normally-closed contact; the anti-tripping protection circuit includes A, B and C phase anti-tripping circuits; and the non-full-phase protection circuit includes three branches in parallel connection, which are an auxiliary contact branch, a non-full-phase time relay 47T1 and non-full-phase time relays 47TX1 and 47TY1.

Description

technical field [0001] The invention relates to the protection of the secondary control of a circuit breaker, in particular to a secondary circuit of a high-voltage circuit breaker. Background technique [0002] With the rapid development of HVDC power transmission system, the AC side of the DC power transmission system needs a filter group circuit breaker for switching filter capacitor banks. For the recovery voltage of 1100kV level filter group circuit breaker breaking capacitive current is high, the current solution at home and abroad is to use two double-break circuit breakers in series to form a four-break filter group circuit breaker. Then it is necessary to solve the problem of synchronism between different poles and the same pole after two double-break circuit breakers are connected in series, and it is necessary to ensure the function of anti-jumping and non-full-phase protection of the secondary control circuit of the circuit breaker. Contents of the invention ...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems existing in the prior art, the present invention provides a secondary circuit of a high-voltage circuit breaker, which can solve the problems of synchronization between different poles and synchronization between the same poles after two double-break circuit breakers are connected in series, and realize the secondary circuit of the circuit breaker. Anti-jump and non-full-phase protection functions of the secondary control loop

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