Distance relay using a polarizing voltage

Details Distance relay using a polarizing voltage Distance relay using a polarizing voltage

1990-04-11

1992-08-18

Stephan, Steven L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 65, 361 79, H02H 326

Patent

active

051404923

ABSTRACT:
A distance relay for protection of power transmission lines, having a plurality of mho elements, each with a predetermined mho impedance characteristic. The relay has the capability of calculating a polarized reference voltage which remains constant through fluctuations in measured transmission line voltage. The difference voltage between the measured line voltage and the product of the measured line current and the mho element characteristic impedance is then compared against the polarized reference voltage in a product-type phase comparator to determine under-impedance conditions. If an under-impedance condition is present, the mho element produces a set output and a calculated "torque" value. The set outputs, if any, are then compared against a look-up table for fault type determination. If more than one set output is present, the magnitudes of the respective torque values are compared for fault type determination.

REFERENCES:
patent: 3986115 (1976-10-01), Huang
patent: 4342064 (1982-07-01), Wilkinson
patent: 4686601 (1987-08-01), Alexander
patent: 4709295 (1987-11-01), Yamaura
patent: 4821137 (1989-04-01), Wilkinson

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