Fast Circuit Breakers for 200 kA Currents
A circuit breaker operated by mechanical rupture, capable of opening very high currents in times of the order of ten microseconds has been realized. A copper conductor in the form of a T, fragilized at the joint of the arms and the leg, is ruptured by oil under a pressure of 3 kbars. This pressure is obtained by the magnetic forces of a 600 kA current pulse flowing in a coaxial conductor system. Current flowing in an inductive storage coil is transferred onto a fuse in 9 microseconds. The subsequent explosion of the fuse can either open the circuit and absorb all the stored energy or transfer it to any desired load. The switch is sufficiently reisolated to withstand the voltage peak thus created. A 200 kA current has thus been opened in 20 microseconds and a 9 kV overvoltage sustained. The system, because of its inherent symetry, can be lengthened to obtain any desired current carrying capacity and requires a relatively small command energy.
KeywordsCircuit Breaker Voltage Peak Capacitor Bank Mechanical Switch Copper Conductor
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