Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1977-12-15
1979-04-17
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361113, H02H 328
Patent
active
041504119
ABSTRACT:
A single transformer is alternately operated as a differential current transformer with its secondary winding connected as the input to a low impedance differential amplifier with large negative feedback during a ground fault current sampling period and then as a coupled resonant circuit operating into a negative resistance network during a neutral-to-ground resistance sampling period. During the fault current sampling period, the amplifier is gated ON and OFF to switch the transformer secondary loading between essentially short-circuit and open-circuit conditions. The resulting amplifier feedback current pulses, indicative of transformer secondary current, are integrated either directly or indirectly, to develop a DC signal proportional to any ground fault current.
REFERENCES:
patent: 3786356 (1974-01-01), MacPhee
patent: 3794884 (1974-02-01), Sircom
patent: 3801871 (1974-04-01), Loh
patent: 3879639 (1975-04-01), Sircom
patent: 3963959 (1976-06-01), Howell
patent: 4001646 (1977-01-01), Howell
patent: 4012668 (1977-03-01), Wittlinger
Bernkopf Walter C.
Cahill Robert A.
General Electric Company
Salce Patrick R.
Schlamp Philip L.
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