Electricity: electrical systems and devices – Safety and protection of systems and devices – Generator protective circuits
Patent
1978-05-04
1980-07-22
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Generator protective circuits
361 58, 361111, 322 8, H02H 706
Patent
active
042142890
ABSTRACT:
A stabilizing equipment for a power transmission system having a power source system, at least one transmission line and at least one line circuit breaker inserted between the power source system and the transmission line for interrupting the transmission line when a fault occurs thereon. The stabilizing equipment comprises a fault detector for detecting the fault, a series damping resistor, first means for inserting the series damping resistor between the power source system and the line circuit breaker before the line circuit breaker is opened and after the fault is detected by the fault detector, a parallel damping resistor, second means for inserting the parallel damping resistor between the power source system and ground after the line circuit breaker is opened, and third means for separating the parallel damping resistor first and subsequently the series damping resistor before the line circuit breaker is reclosed after reclosing conditions are satisfied. According to this invention, the transient stability of the power transmission system is improved even if the transmission line is interrupted long after the occurrence of the fault, for example, by a back up protective relay.
REFERENCES:
patent: 2300935 (1942-11-01), Kovalsky
patent: 3098190 (1963-07-01), Spencer, Jr. et al.
patent: 3234397 (1966-02-01), Park
patent: 4042963 (1977-08-01), Kriechbaum
patent: 4051545 (1977-09-01), Kloss
Otsuka Kei
Shigehara Masamichi
Yokokawa Sumio
Fuji Electric & Co., Ltd.
Salce Patrick R.
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