Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1978-06-30
1980-05-13
Gellner, Michael L.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307252M, 307252T, 361100, 323 24, H03K 1768
Patent
active
042030404
ABSTRACT:
The invention provides a bilateral static isolator which is activated by "soft" forced commutation. Between two points in the power line to be interrupted are connected two thyristors in series-opposition, thus cathode to cathode. In antiparallel with each thyristor is mounted a diode. Thus, the two diodes appear in series opposition between the two power line points. A resonant circuit is applied to the conducting thyristor in order to turn it off with a relatively small reverse voltage. This voltage is obtained by resonant discharge of a precharged capacitor C through an inductor L and a diode D connected in reverse with the thyristor. The forward voltage drop of the diodes appears in reverse across the thyristors from the instant the discharge current rises above the line current until the instant the discharge current drops below the level of the line current. It is during this interval that the thyristor is provided with "soft" reverse bias. Subsequently the net current reverses again. With the thyristor now recovered, and the diode blocking, the current flows through the other diode and returns by the commutating branch associated therewith.
REFERENCES:
patent: 3723816 (1973-03-01), Pollard
patent: 3725742 (1973-04-01), Pollard
patent: 3737759 (1973-06-01), Pollard
patent: 3921038 (1975-11-01), Kernick et al.
Abbondanti Alberto
Stacey Eric J.
Dwyer James L.
Gellner Michael L.
Lorin C. M.
Westinghouse Electric Corp.
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