Fault-current protector means

Details Fault-current protector means Fault-current protector means

1997-12-11

1999-06-29

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 42, H02H 316

Patent

active

059176873

ABSTRACT:
Fault-current protector circuitry has a first totalling current transformer (7) with a primary winding formed from phase (1) and neutral (2) conductor lines and a secondary winding (13) connected to a first analyzer circuit (16). A second totalling current transformer (10) has a primary winding formed by a protective conductor line (3) and a secondary winding (17) connected to a second analyzer circuit (20). A trigger device (24) connected to the first and second analyzer circuits actuates switches (4,5,6) which are connected into each conductor (1,2,3). The fault-current protector circuitry is especially for isolation monitoring of electrical circuits and which has the advantage of reliably isolating the monitored circuit from the mains if fault currents occur in the phase or neutral conductor lines and if a current appears in the protective conductor line.

REFERENCES:
patent: 5224006 (1993-06-01), MacKenzie et al.
patent: 5708551 (1998-01-01), Bosatelli

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