Distance relay with load encroachment protection, for use with p

Details Distance relay with load encroachment protection, for use with p Distance relay with load encroachment protection, for use with p

1992-10-14

1994-11-22

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

324522, H02H 326

Patent

active

053674260

ABSTRACT:
Voltage and current on a power transmission line are first obtained, filtered and converted to digital representations. The positive sequence components of the voltage and current are determined and the impedance at the relay is then calculated from those positive sequence voltages and currents. The positive sequence impedance is converted into a magnitude and phase angle representation and then compared against a load pattern which is also represented by magnitude and phase angle representations. If the calculated impedance at the relay is within the load impedance pattern, the distance relay is prevented, i.e. blocked, from sending an output signal to trip a circuit breaker protecting the transmission line.

REFERENCES:
patent: 4092641 (1978-05-01), Williams
patent: 4821137 (1989-04-01), Wilkinson
patent: 4896241 (1990-01-01), Li et al.

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