Protective relay

Details Protective relay Protective relay

1982-09-20

1984-08-07

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

364483, H02H 338

Patent

active

044646984

ABSTRACT:
A protective relay which carries out various relay functions by converting externally received AC data into time widths in accordance with protective ranges and determining whether or not the protective operations are necessary on the basis of the time widths. The protective relay receives a plurality of input AC data through a time-dividing device and converts the time-divided data into the time widths for the relay functions to determine the relay operations of the relay functions on the basis of the time widths.

REFERENCES:
patent: 3885199 (1975-05-01), Nohara et al.
patent: 4377833 (1983-03-01), Udren
patent: 4420805 (1983-12-01), Yamaura et al.
"Microprocessor Based Digital Relays Application in TEPCO"--Yamaura et al. IEEE Transactions on Power Apparatus and Systems, vol. PAS-100 No. 5, 5/81.

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