Fault-current limiter for high power electrical transmission sys

Details Fault-current limiter for high power electrical transmission sys Fault-current limiter for high power electrical transmission sys

1974-11-01

1976-05-18

Envall, Jr., R. N.

317 40A, H02H 308

Patent

active

039573290

ABSTRACT:
A fault-current limiter is formed as a self-contained unit which can be connected in an existing power transmission system. The fault-current limiter consists of a series-connected inductor and capacitor which are resonant with the power line frequency, and a normally open switch is in parallel with the capacitor. A sodium fuse connected in series with a calibrating impedance is connected in parallel with the switch and the fuse is operated under predetermined circuit current conditions. The sodium fuse extends an operating plunger upon its operation, and the plunger causes the switch to close, thereby to short-circuit the capacitor and connect the current-limiting impedance of the inductor in the main power circuit.

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patent: 2468498 (1949-04-01), Kyle, Jr. et al.
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patent: 2567413 (1951-09-01), Ryan et al.
patent: 2656490 (1953-10-01), Ryan
patent: 2810865 (1957-10-01), Minder
patent: 3461308 (1969-08-01), Kalkner et al.
patent: 3522472 (1970-08-01), Breitholtz
patent: 3590319 (1971-06-01), Baltensperger
patent: 3599137 (1971-08-01), Toshioito et al.

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