Protective relay apparatus for detecting high-impedance ground f

Details Protective relay apparatus for detecting high-impedance ground f Protective relay apparatus for detecting high-impedance ground f

1983-09-01

1986-07-15

Tolin, G. P.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With phase sequence network analyzer

H02H 326

Patent

active

046009612

ABSTRACT:
A protective relay for detecting high-impedance ground faults on a three-wire distribution system. The protective relay operates independently of the current in the ground path by using the positive and negative sequence currents to detect a fallen conductor. The ratio of the negative sequence to positive sequence current is calculated and when this ratio exceeds a predetermined value, a trip signal is produced.

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