Abstract:

The development of DC distribution network and the application of DC circuit breaker put forward new requirements for the disconnector and its operating mechanism,such as fast,miniaturization and economic type.At present,most of the fast disconnectors at home and abroad use electric repulsion operation mechanism,which has achieved the formation of insulation isolation fracture within 2 ms.But the electric repulsion operating mechanism has the problems of high cost,short mechanical life and large volume.In view of the above problems,a fast operating mechanism combining permanent magnet and pneumatic was proposed.Its control loop is simplified,the volume is reduced,the cost is reduced and the reliability is improved.In this paper,the feasibility of the method is verified by using the finite element analysis software of Infolytica magnet.The theoretical and experimental results show that the scheme meets the design requirements and verifies the feasibility of the method.

Key words: quick disconnector, DC circuit breaker, permanent magnet mechanism, pneumatic mechanism, quick operation mechanism