Circuit breakers for direct and alternating current

Details Circuit breakers for direct and alternating current Circuit breakers for direct and alternating current

1985-01-30

1987-08-11

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural load circuit systems

Control of current or power

318345R, 363124, 363135, H02H 308

Patent

active

046863931

ABSTRACT:
Circuit breakers which employ a capacitor to pass a current in opposition to a load current through a thyristor when interruption is required suffer from the disadvantage that high switching over-voltages occur. In the present invention current is diverted from the main first thyristor through a resistor when second and third thyristors are fired to pass a commutating current from a capacitor through the first thyristor. As a result the values of the resistor and the capacitor control the over-voltage and they are chosen to reduce it to approximately half the value obtained with equivalently rated conventional thyristor-based circuit breakers. In a second stage of commutation a fourth thyristor is fired to pass commutating current through the second thyristor to effect final interruption of the load current and the values of a parallel resistance-capacitance circuit in series with the second thyristor are chosen to reduce a second over-voltage which occurs when the second thyristor is commutated.

REFERENCES:
patent: 3098949 (1963-07-01), Goldberg
patent: 3532900 (1970-10-01), Rhyne
patent: 3558982 (1971-01-01), Greenwood
patent: 3693069 (1972-09-01), Kelley et al.
patent: 3986098 (1976-10-01), Tamii et al.
patent: 4087726 (1978-05-01), Bourguet et al.
patent: 4093980 (1978-06-01), Gurwicz
patent: 4358811 (1982-11-01), Arremann
patent: 4471277 (1984-09-01), Franz

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