Apparatus for overvoltage protection of a direct converter in th

Details Apparatus for overvoltage protection of a direct converter in th Apparatus for overvoltage protection of a direct converter in th

1976-01-06

1977-09-27

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

Impedance insertion

323 81, 361 56, 361111, 363 53, H02H 7122

Patent

active

040515451

ABSTRACT:
Apparatus for overvoltage protection of a direct converter utilizing controllable semi-conductor valves and whose output is connected to the rotor circuit of an asynchronous electrical machine includes a stepped impedance circuit which is controlled by a stepped current valve switching circuit. The stepped impedance circuit is connected to the output terminals of the converter and the valves of the switching circuit are controlled in accordance with the amplitude of any transient overvoltage induced in the rotor circuit in such manner that the total resistance value of the impedance circuit varies inversely with the amplitude of the overvoltage. The impedance switchable into and out of the circuit can be arranged in series, or in parallel, or in series-parallel.

REFERENCES:
patent: 2948843 (1960-08-01), Klein
patent: 3213349 (1965-10-01), Gutzwiller
patent: 3555361 (1971-01-01), Hallberg
patent: 3711759 (1973-01-01), Krauthamer
patent: 3886432 (1975-05-01), Piccone et al.

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