The anti-jump circuit of the circuit breaker is to add an anti-jump relay in the control circuit of the circuit breaker, so that after the circuit breaker is closed, the closing circuit is opened, and the closing command signal is isolated until the closing command signal is cancelled. In this way, the circuit breaker can be fixed in one state: stable closing state or opening state.
When considering the anti-jumping design of the closing circuit, two issues must be considered: who performs the switching on and off of the anti-jumping circuit and how to perform it; the terminal voltage of the anti-jumping circuit, that is, how the signal source is provided.
After analysis, the closing process of the spring operating mechanism type vacuum circuit breaker is actually the process of releasing energy by the closing spring. The condition for the jump is: the closing signal still exists, and the closing circuit is still conducting (that is, the circuit breaker is in the state of energy storage when the circuit breaker is opened), so for the spring operated mechanism type vacuum circuit breaker, the maximum time interval for jumping is The energy storage time of the motor pulling the spring. Therefore, the anti-tripping appliance should start to act when the switch is closed.
At present, two methods are often used to perform the loop operation of the anti-hop relay: the magnetic powder clutch passes the energy storage stroke switch; and the circuit breaker position auxiliary switch. Both methods can ensure that the anti-jump relay can work normally after the closing action is completed. Beijing oil fume purifiers use the self-locking contacts of the anti-jump relay to achieve the normal connection of the anti-jump circuit.
The anti-jump circuit is the same as the closing circuit, and uses its normally closed contacts to realize whether the closing circuit is connected or not, to ensure that the closing signal is isolated in the fault state, thereby locking the circuit breaker in the open state. After the closing command signal disappears, the anti-hopping relay loses power and no longer works, its self-locking contact is disconnected, the anti-hopping circuit is cut off, and the normally closed contact is reset to ensure that the closing circuit remains conductive when the opening has been stored. To prepare for the next normal closing.
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