PERFECCIONAMIENTOS EN DISPOSITIVOS DE PROTECCION PARA INTE-RRUPTORES A TIRISTORES.

摘要

The invention concerns a protection device for a thyristor type switch comprising a protection circuit consisting of two Zener diodes of opposite conductivity in series with each other and in parallel with the thyristor type switch. In addition a reactance which can be saturated and has slight magnetic losses is connected in series with the thyristor type switch and thus in parallel with the Zener diodes. In modifications of the basic invention a capacitor is connected in parallel with both the lead containing the thyristor and reactance and with the Zener diodes. Finally, a resistor can be connected to the lead containing the thyristor and reactance. The invention is applied in particular to synchronous transformer tap changing switches.