Method of testing distance relays

Details Method of testing distance relays Method of testing distance relays

1979-05-14

1980-10-14

Moore, David K.

Electricity: measuring and testing

Electromechanical switching device

Relay

324 52, H01H 4700

Patent

active

042283981

ABSTRACT:
A method of automatically plotting the loci curves of multi-stage distance relays. The comparison impedances, required for the measurement, are automatically provided for given impedance angle by adjustable currents and voltages. During the determination of the loci curves there is started with a defined, predetermined impedance value which is either greater or smaller than that which is sought to be found. By taking the half of this impedance value or by doubling with subsequent halving, when starting with smaller impedance values, it is possible to incrementally approach the sought of impedance value as a function of whether or not, for the corresponding timing stage of the distance relay, its measuring element responds or does not respond.

REFERENCES:
patent: 3922587 (1975-11-01), Jones
patent: 4177419 (1979-12-01), Fiorentzis

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