Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1988-03-17
1990-08-07
Jennings, Derek S.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
361 56, H02H 524
Patent
active
049472828
ABSTRACT:
A thyristor valve circuit protected having an arrester to protect it from an overvoltage. The circuit includes a voltage detector for detecting a forward voltage level applied to the thyristor valve and generating a signal sVp when the detected voltage level exceeds a predetermined voltage which is set lower than the protection level of the arrester, and a circuit for generating a gate pulse applied to the thyristor valve in response to the signal sVp* from the voltage detector. The gate pulse generating circuit permits the gate pulse to be applied to the thyristor only when the condition of the presence of conduction command signal PHS and forward voltage signal FV, and the absence of output signal sVp* of the voltage detector, is satisfied.
REFERENCES:
patent: 4414599 (1983-11-01), Kobayashi
patent: 4536816 (1985-08-01), Matsumura et al.
patent: 4651251 (1987-03-01), Thiele
patent: 4656554 (1987-04-01), Maschek et al.
patent: 4665458 (1987-05-01), Matsuoka et al.
patent: 4697219 (1987-09-01), Mitsuoka
IEEE Transactions on PAS, vol. PAS-102, No. 8, Aug. 1983, (pp. 2786-2791), S. Kobayashi et al.
Jennings Derek S.
Kabushiki Kaisha Toshiba
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