Three-phase leakage protection by electronic control

Details Three-phase leakage protection by electronic control Three-phase leakage protection by electronic control

1983-01-28

1985-07-30

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 47, 361 50, 340650, H02H 316

Patent

active

045325685

ABSTRACT:
A system is provided for early detection of leakage currents through ground connections of loads such as three-phase motors connected to isolated secondary windings of supply transformers. An alarm device is energizable when leakage current is a small fraction of a predetermined value which might present a potential hazard, the point of energization being adjustable by an operator until the predetermined value is reached. Thereafter, it is adjustable only by a supervisor, after operation of a key switch. Circuitry is provided to obtain sensitive, stable and reliable operation.

REFERENCES:
patent: 3286129 (1966-11-01), Gagniere
patent: 3440491 (1969-04-01), Tenenbaum et al.
patent: 3515942 (1970-06-01), Gordon
patent: 3665252 (1972-05-01), Rogers, Sr. et al.
patent: 3705507 (1972-12-01), Sanders et al.
patent: 3742161 (1973-06-01), Lipschutz
patent: 4099215 (1978-07-01), Parrier et al.

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