Ground fault detection circuit

Details Ground fault detection circuit Ground fault detection circuit

1982-08-27

1985-09-17

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 45, H02H 328

Patent

active

045424322

ABSTRACT:
A current monitoring circuit of a ground fault detector which receives its input from the secondary winding of an annular core transformer through which extends the current carrying leads being monitored. A resistor and capacitor are connected in series between the secondary winding and an AC amplifier to form an RLC band pass filter to minimize the circuits sensitivity to noise outside of the band of frequencies of interest. The sensitivity of the circuit to temperature changes due to fluctuations of the inductance is reduced by choosing an inductance value sufficiently high to ensure that it is not reduced to below a critical level at which sensitivity is effected.

REFERENCES:
patent: 3962606 (1976-06-01), Burns et al.
patent: 4263637 (1981-04-01), Draper et al.
Physics Part II-Halliday et al., John Wiley & Sons, p. 902.
Standard Handbook for Electrical Engineers-McGraw-Hill Book Company, pp. 4-112.

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