Fault current limiter

Details Fault current limiter Fault current limiter

1977-07-05

1979-06-19

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Impedance insertion

361113, H02H 308

Patent

active

041588649

ABSTRACT:
A current limiting network is connected in a power line between an AC power supply and a load, and has a pair of series connected resonant branch circuits, each of which include a capacitance and an inductance tuned to the power supply frequency. Under normal operation virtually no impedance is offered by the network. Each branch circuit has a circuit node between the capacitor and inductor contained therein. A switch, having a resistance in series therewith, is connected between the circuit nodes in the branch circuits. The branch circuits are connected in parallel, and a resistance is connected in parallel with the branch circuits. The switch is responsive to a fault current in the power system and when actuated, detunes the series resonant branch circuits to thereby present a high impedance to the power line. The parallel resistance reduces the level of any transient surges and the time of any oscillation appearing on the capacitors when the switch is actuated by a fault current. Another embodiment selectively suppresses transients and reduces oscillation on the branch circuit capacitors.

REFERENCES:
patent: 2202716 (1940-05-01), Partington
patent: 3047746 (1962-07-01), Berkery
patent: 3356900 (1967-12-01), Kalkner
patent: 3356901 (1967-12-01), Kramer et al.
patent: 3418532 (1968-12-01), Becker
patent: 3436600 (1969-04-01), Salo
patent: 3487264 (1969-12-01), Cure
patent: 3529210 (1970-09-01), Ito et al.
patent: 3573549 (1971-04-01), Wolf
patent: 3646397 (1972-02-01), Ruthenberg et al.
patent: 3711759 (1973-01-01), Krauthamer
patent: 3745416 (1973-07-01), Thanawala

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