High resistance ground fault protection

Details High resistance ground fault protection High resistance ground fault protection

H - Electricity

02

H

348/32

H02H 3/16 (2006.01) G01R 31/02 (2006.01) H02H 1/00 (2006.01) H02H 3/38 (2006.01)

Patent

CA 1311044

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 corre- sponding loss function VN (4f) for a certain time exceeds a lower limit value - all on condition that a zero sequence current (Io) exists - then there is a high resistance ground fault on any of the phases of the network. (Figure 2)

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