Short-circuit protector for a half-controlled three-phase bridge

Details Short-circuit protector for a half-controlled three-phase bridge Short-circuit protector for a half-controlled three-phase bridge

1989-10-06

1990-07-17

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

363 50, H02H 308

Patent

active

049424947

ABSTRACT:
In a half-controlled three-phase bridge for feeding an inductive load, a further, externally charged capacitor and a further thyristor are additionally connected to the conventional protective capacitor which is already in existence. The further capacitor, which is charged from an external high-impedance voltage source, has the effect of causing an increased load current to be taken over by the further thyristor so that one of the conducting thyristors of the bridge is extinguished. The capacitor recharges and its voltage is used as a blocking voltage for the thyristor of the bridge which has just been extinguished so that the energy supply from the power system is stopped. The current in the load circuit can then be removed through a free-wheeling diode.

REFERENCES:
patent: 3887862 (1975-06-01), Huber
patent: 4428023 (1984-01-01), Maier

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