INSTALLATION METHOD FOR VACUUM CIRCUIT BREAKERS Russian patent published in 2010 - IPC H01H11/00 H01H33/66 

FIELD: electricity.

SUBSTANCE: in the process of circuit breaker installation, when time-optimal by bounce contact pressing is set the stability of circuit closing and/or opening by moving contact is checked. This check is performed by means of feeding voltage pulses to control winding. The pulses will be 2.5-3 longer than vacuum circuit-breaker actuation time and their total number will be 1 to 10% of commutation guaranteed number during field operation depending on circuit breaker type. In this process, after the time period that is 1.5-2 times longer than circuit breaker actuation time, the number of commutations is recorded that did not cause closing and/or opening of contacts circuit, and in their presence additional adjustment of bridge contact preload and the second check of contacts circuit closing and opening stability is performed.

EFFECT: increasing stability of contacts circuit closing and opening during commutation, decreasing probability of contacts circuit opening and enhancement of high-frequency current passage reliability during operation in conditions of acceleration, mechanical loads and high temperatures.

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