Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1985-01-29
1987-06-02
Wong, Peter S.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363135, 361 57, 361100, H02H 7122
Patent
active
046708308
ABSTRACT:
In order to protect converter equipment which includes GTO switching-off thyristors and having d-c inputs and a protective inductance connected in series therewith against short circuit currents, a short circuit path for d-c current flowing from a d-c supply source on the one hand, and on the other hand, an energy storage device, is inserted into the d-c circuit, closed via an auxiliary thyristor, of the converter equipment in such a manner that through the change of the state of storage of the energy storage device, a countervoltage is impressed on the d-c terminals, which leads to the forcible commutation of the switching-off thyristors. The energy storage device advantageously comprises an auxiliary winding of a limiting choke serving as a protective inductance. The fault current, which increases steeply in the event of a short circuit via the protective inductance and the auxiliary thyristor, causes, due to the magnetic coupling, the generation of a counter voltage in the supplemental winding required for forcible commutation of the switching-off thyristors. For monitoring the current and for generating the auxiliary thyristor firing energy, a monitor likewise fed inductively by means of the protective inductance may be provided.
REFERENCES:
patent: 3444453 (1969-05-01), Peterson
patent: 3569819 (1971-03-01), Martzloff
patent: 3916287 (1975-10-01), Brenneisen et al.
patent: 3947748 (1976-03-01), Klein
patent: 4346421 (1982-08-01), Gurr
G. L. Campen, et al., Voltage Protection Scheme for MG Sets Used to Drive Inductive Energy Storage Systems, pp. 1079-1081, Oct. 1977.
Siemens Aktiengesellschaft
Wong Peter S.
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