Investigation of Impulse Aging of Energy-Absorption Elements for Hybrid DC Circuit Breakers

The state of the energy-absorption branch MOV in hybrid DC circuit breaker (DCCB) has a very important impact on short fault breaking operation breaker. Therefore, it is necessary to evaluate MOV, which also called “sleep component”. Due DCCB being placed indoors, aging mainly caused by short-circuit impulse current. this paper focuses study characteristics MOV. dynamic simulation system was built investigate current during process. Then, an accelerated test platform and tests were conducted. analyzed detail detailed analysis conducted macroscopic parameters microstructure changes. results indicate that nonlinear coefficient α could be emphasized as basis for judging “sleeping” component states degree breaker, can expected applicable condition monitoring BCCB future.