Transformer protective relay

Details Transformer protective relay Transformer protective relay

1985-04-15

1987-04-28

Paschall, M. H.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

361 35, 361 60, 361 87, H02H 704

Patent

active

046618775

ABSTRACT:
A protective relay for a transformer issues a relay tripping command when the differential current that is the difference between currents in the primary and secondary windings of the transformer has a magnitude larger than the specified value and, at the same time, when the differential current includes the fifth harmonic component less than the specified value. Another cause of tripping signal generation is the differential current value processed to have a certain timer characteristics.

REFERENCES:
patent: 4204237 (1980-05-01), Zocholl
patent: 4477854 (1984-10-01), Usui et al.
"Technology in Protective Relay", Protective Relay Engineering, Jul. 20, 1981.
A Three-Phase Differential Relay for Transformer Protection, Einvall et al., IEEE Transactions on Power Apparatus and Systems, Nov./Dec. 1975, pp. 1971-1980.

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