High resistance ground fault protection

Details High resistance ground fault protection High resistance ground fault protection

1988-09-07

1989-10-31

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 82, 361 84, 324509, 324522, 324525, 364483, H02H 326

Patent

active

048781428

ABSTRACT:
A protection device for high resistance ground faults in a power network according to the invention has a fault detection principle which is based on an indirect study of non-harmonic frequency components of the phase currents. When such a fault has occurred, a considerable change of the energy contents of these frequencies arises. This change can be detected by a device according to the invention. If by comparison (4e) between digitized input signals (I') and a harmonic Fourier model (4d) of the same signals, i.e. generation of the residuals of the system, it is found that a difference exists, and if the corresponding loss function V.sub.N (4f) for a certain time exceeeds a lower limit value - all on condition that a zero sequence current (I.sub.O) exists - then there is a high resistance ground fault on any of the phases of the network.

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