Anti-tripping circuit combining breaker and relay protection

Abstract

The invention discloses an anti-tripping circuit combining a breaker and relay protection. The anti-tripping circuit combining the breaker and the relay protection mainly comprises an anti-tripping unit, a closing unit and an opening unit of the breaker, and a closing supervision unit, a tripping supervision unit and an anti-tripping unit of the relay protection. The closing supervision unit is in series connection with the anti-tripping unit of the breaker, and is mainly composed of a tripping position supervision relay coil, a breaker normally closed auxiliary contact and a normally closed contact of anti-tripping relay which are in series connection. After a closing supervision unit loop is in series with the normally close auxiliary contact of the breaker and the normally closed contact of the anti-jumping relay, and the breaker closes, the closing supervision unit loop is separated from an anti-tripping unit loop of the breaker to eliminate interferences by the closing supervision unit. At the same time, the closing supervision unit and the breaker closing unit form a loop, and the closing supervision unit can supervise a breaker closing loop, so that an original function is saved. The design of a new loop enables anti-tripping of the breaker and the relay protection to be realized in a same loop, and an anti-tripping function is realized through integrating advantages of the anti-tripping modes of the breaker and the relay protection.

Description

Technical field [0001] The invention relates to an anti-trip circuit of a power system, in particular to an anti-trip circuit combined with a circuit breaker and a relay protection. Background technique [0002] High-voltage circuit breakers play a control role in high-voltage circuits and are one of the important electrical components in high-voltage circuits. The circuit breaker is used to turn on or off the circuit during normal operation. In the case of a fault, the circuit is quickly disconnected under the action of the relay protection device, and the short-circuit current is reliably connected under special circumstances (such as automatic reclosure to the fault line). High-voltage circuit breakers are special electrical appliances that connect or disconnect high-voltage circuits under normal or fault conditions. Therefore, whether the circuit breaker operates reliably or not directly affects the safe operation of the power system. Circuit breakers and relay protection ma...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that no conflict occurs when the anti-jumping of the existing circuit breaker and the anti-jumping of the relay protection are used in combination, the present invention provides a method in which not only the two anti-jumping methods can coexist, but also the combined circuit can combine the two Combined anti-jump circuit with the advantages of the anti-jump method

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