Fault current limiting circuit

Details Fault current limiting circuit Fault current limiting circuit

1997-04-23

1999-02-02

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 58, 361104, H02H 300

Patent

active

058673580

ABSTRACT:
A fault-current-limiting circuit for a poly-phase circuit of the type including a plurality of inductive windings each of which has a first terminal connected to a common point and at least one of the windings having a second terminal connected to an electrical load is disclosed. The fault-current-limiting circuit has a first electrical path between the common point and ground which includes a current-limiting device having a first state whereat current passes through the device and a second state whereat current through the device is limited and wherein the device switches from the first state to the second state when current through the device exceeds a predetermined maximum and a second electrical path between the common point and ground having an electrical resistance significantly greater than a resistance of the first path when a device is in its first state.

REFERENCES:
patent: 1378557 (1921-05-01), Pragst
patent: 1865409 (1932-06-01), Boehne
patent: 2149683 (1939-03-01), Leyburn
patent: 2258246 (1941-10-01), Hamilton
patent: 2920164 (1960-01-01), Edsall
patent: 4580186 (1986-04-01), Parker et al.

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