Strength and Delay-Time of Magnetic Field in Magnetic Vacuum Circuit Breaker: A Simulation and Experimental Study

The strength and delay-time of the magnetic field,generated by the 2/3-turn coil(Type-A) and horseshoe bipolar(Type-B) magnetic-contacts,in high voltage large current magnetic vacuum circuit breaker,was mathematically modeled,numerically simulated with ANSYS software and experimentally measured with the self-built test platform.The influence of the contact types on the strength/delay-time of magnetic field was investigated.The simulated results show that Type-B contact outperforms Type-A contact because of larger magnetic field strength,greater current carrying capacity and shorter delay-time.For example,the magnetic field strengths of Type-A/B are 3.7~5.6 mT/0.7~11 mT,respectively;and the delay-times of Type-A/B are 1.28~1.4 ms/0.49~0.73 ms,respectively.The simulated and measured results were found to be in good agreement.We suggest that the simulated results be of some technological interest in design of high voltage large current magnetic vacuum circuit breaker.