Digital protective relay monitoring system

Details Digital protective relay monitoring system Digital protective relay monitoring system

1985-01-07

1987-08-25

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Electromechanical switching device

Relay

324537, 324 55, 340646, 340644, H02H 300, G01R 3102, G01R 3132

Patent

active

046895701

ABSTRACT:
A digital protective relay monitoring system for testing the analog input section of the relay by application of a monitoring signal, with a frequency different from the power frequency, superimposed on the line voltage and current sensor signals. After the signals have been sampled in the form of digital data, the monitoring signal component is extracted through the digital filtering process and compared with the reference value, and a fault in the analog input section of the relay is detected on the basis of the result of comparison.

REFERENCES:
patent: 3408493 (1968-10-01), Westover
patent: 4107471 (1978-08-01), Reed
patent: 4224466 (1980-09-01), Bush
patent: 4420721 (1983-12-01), Dorey
patent: 4437056 (1984-03-01), Pierro

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