Ground leakage relay circuit

Details Ground leakage relay circuit Ground leakage relay circuit

1970-10-09

1978-05-23

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

H02H 316

Patent

active

040914313

ABSTRACT:
A ground leakage relay circuit including a core balance transformer through which pass the supply and return line of the circuit to be protected and having a multi-turn secondary winding. A capacitor is connected to be normally charged from a d.c. source. A normally conducting transistor is connected across the capacitor. When the transformer secondary winding exceeds a preselected level, the transistor is switched "off" to permit a voltage build-up across the capacitor. When the voltage across the capacitor reaches a triggering value, it actuates a relay to open the supply line.

REFERENCES:
patent: 3213321 (1965-10-01), Dalziel
patent: 3286129 (1966-11-01), Gagniere

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