Summary: The device of breaker leap closedown that electric return circuit makes still is used generally. The electric current that chooses a coil of movement of flow pattern having report normally relay regards bouncing closedown relay as TBJ, cost of action of electric current of coil of its electric current presses electric current of breaker tripping operation to choose, in order to assure the behavioral sensitivity of relay. Change relay because wiring is simple,electric streamline encircles the means of parameter, monitor easily, it is the main means that uses at present; And by relay coil and shunt-wound spur track form bouncing closedown relay the means of the voltaic loop that start, because its are easy,change parameter, also relatively welcome of the member that be controlled to build and run a person, but because circuit is relatively complex, and cannot realize pair of relay the surveillance of coil, reason still needs to accumulate experience further, discretion is used.

Keyword: TBJ of breaker leap closedown

1, the circuit analysis of bouncing closedown loop

Return of electric and bouncing closedown achieves by bouncing closedown relay normally. Graph 1 it is the hookup of bouncing closedown loop that applies to the breaker that has coil of a tripping operation. TBJ has bouncing closedown relay a TBJ/I of the coil of an electric current that start, voltage maintains coil TBJ/U, 2 pairs are moved add up to contact TBJ1, TBJ4 mixes 2 pairs break contact TBJ2, TBJ3, TBJ/I receives the return of tripping operation coil at breaker, TBJ/U receives the return closing gate at breaker, TBJ1 makes electric current maintain oneself with, TBJ2, loop closing gate is strung together after TBJ3 is shunt-wound.

When tripping operation relay TJ movement starts tripping operation when, TBJ/I excitation, TBJ movement, TBJ1 closes tripping operation the command maintains, disconnect till breaker, at the same time TBJ2, TBJ3 disconnects loop closing gate, TBJ4 closes, the voltage that prepares TBJ maintains return circuit oneself. Before if be in,breaker did not disconnect, namely before TBJ was not returned, the hand adds up to relay contact SHJ or ZHJ of contact of automatic coincide brake close, criterion the TBJ4 that TBJ classics has closed and SHJ or ZHJ maintain oneself, namely TBJ2, TBJ3 continues to be in disconnect condition, make sure breaker won't close gate, achieve the goal of bouncing closedown.

2, the technical requirement of bouncing closedown relay

2.1 electric current are started be worth

Opposed accident measure and power system 2 times 1984 according to power industry ministry the regulation of loop design rules, the electric current of bouncing closedown relay starts a value to should cooperate with the tripping operation electric current of breaker, 50% what its electric current starts a value to must not be more than electric current of breaker tripping operation, namely 2 times what the electric current of loop of the tripping operation when tripping operation should be more than TBJ to start electric current, the reliable coefficient that assures TBJ electric current is more than 2.
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