一种双绕组电磁脱扣器的理论研究及控制策略

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Abstract In order to meet the selective protection requirements of smart grid for multi-level distribution network, the release of circuit breaker must realize the function of short-circuit short-time delay protection. For this reason, a double winding electromagnetic release is presented, and its working principle is introduced from the two directions of theoretical analysis and finite element simulation. The control module based on magnetic reed switch and time relay is designed, and the control strategy of time relay is given. Theoretical analysis and finite element simulation show that the secondary winding has demagnetization effect, which can achieve the purpose of short-circuit short-time delay. The control module of the time relay can adjust the action time, so as to flexibly change the short-circuit delay time according to the actual needs, which has high practicability.

Key words： short-circuit short-time delay double winding demagnetization control strategy

Received: 26 October 2020

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