High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – With capacitor
Patent
1995-09-18
1998-10-13
Friedhofer, Michael A.
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
With capacitor
361113, H01H 3316, H02H 300
Patent
active
058214968
ABSTRACT:
The steep initial rate of rise of the transient recovery voltage across the poles of a circuit breaker just after a fault current break is decreased. The breaking performance in the case of a short-circuit fault to ground taking place in an electrical power transmission system at relatively as near a place as several kilometers apart from the circuit breaker, that is a short-line-fault is improved by a saturable reactor having a capacitor connected in parallel therewith to the circuit breaker in series. As a result, as the saturable reactor changes from the magnetically saturated state to the unsaturated state just before the zero point of the fault current, the self-inductance of the saturable reactor gradually increases and an LC resonance is produced between the self-inductance of the saturable reactor and the capacitor connected to the saturable reactor in parallel. Therefore, the peak value and the time period of the current flowing from the saturable reactor can be controlled to control the initial rate of rise of the transient recovery voltage.
REFERENCES:
patent: 3522472 (1970-08-01), Breitholtz
patent: 3611031 (1971-10-01), Lutz
patent: 3946300 (1976-03-01), Landis
patent: 3957329 (1976-05-01), McConnell
Asai Yoshihito
Kashimura Katsuichi
Korosawa Yukio
Koyanagi Osamu
Mizufune Eisaku
Friedhofer Michael A.
Hitachi , Ltd.
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