The Static CB Clausole campione

The Static CB. The Static CB used for the prototype, is a static current interruption module supplied by Ansaldo for the toroidal circuit of RFX [29]. It is composed of 3 paralleled IGCT 5SHY32L4512, provided with snubbers for current derivative limitation during turn-on and voltage clamp during turn-off. A diode for blocking inverse voltage is connected in series to each IGCT. The Static CB is able to interrupt unidirectional dc current up to 10kA, with a maximum voltage of 4 kV (maximum no load voltage without commutation). It is designed for a duty cycle of 0.5 s every 10 minutes. The current in each IGCT can be measured by means of shunt resistors that have also the aim of assuring a good current sharing between the three devices.