4th International Conference on Electric Power Equipment– Switching Technology (ICEPE-2017)

510 / 2017-05-13 22:52:26

Design of a 126 kV Double-break Fast Vacuum Circuit Breaker for Controlled Switching

controlled switching,high voltage circuit breaker,fast vacuum circuit breaker,electromagnetic repulsion mechanism

会场 > Emerging Switching Technologies

The controlled switching technology of a short circuit current has been proposed for a long time. However, the opening time of the mechanism used in the high voltage circuit breaker is normally tens of milliseconds and has a variation of milliseconds. The electromagnetic repulsion mechanism has a very limited variation in the opening time. It provides a potential of achieving the controlled switching of high voltage circuit breaker. The objective of this paper is to design a 126 kV double-break fast vacuum circuit breaker for controlled switching. The 126 kV fast vacuum circuit breaker driven by the electromagnetic repulsion mechanism. It is consist of two fast circuit breaker units. Each one has a vacuum interrupter and is driven by an electromagnetic repulsion mechanism individually. The two fast circuit breaker units are connected in series to withstand the voltage applied on the whole fast circuit breaker. Grading capacitors are used to balance the voltage distribution between the interrupters. Both fast circuit breaker units are arranged in the metal-enclosed tank. The external insulation of the fast circuit breaker units is provided by SF6 of 0.2 MPa.