Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
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.
Harrison Edward A.
Nichols, III Edward L.
Guttman Richard T.
Moose Jr. Harry E.
Potthast James W.
Reynolds Donald P.
Square D Company
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