Network protector relay

Details Network protector relay Network protector relay

1979-12-17

1981-10-06

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Automatic reclosing

361 62, 361 65, 361 76, 361 82, H02H 326

Patent

active

042938864

ABSTRACT:
A network protector relay produces a close signal entirely from sequence components based on the magnitude and phase relationships between the positive sequence component of the phase-to-ground voltages on the network side of the protector and the positive sequence component of the phasing voltages. The close signal may be inhibited by either the presence of the negative sequence component of the phase-to-ground voltages on the network side of the protector or if a trip contact is closed. The trip contact will be closed under certain specified conditions which make it advantageous to prevent manual closing of the contacts.

REFERENCES:
patent: 3248609 (1966-04-01), Gambale
patent: 3312864 (1967-04-01), Schwanenflugel
patent: 3405320 (1968-10-01), Schwanenflugel
patent: 3697811 (1972-10-01), Little
patent: 3704392 (1972-11-01), Chen et al.
patent: 3947728 (1976-03-01), Smith
patent: 4091433 (1978-05-01), Wilkinson
patent: 4130851 (1978-12-01), Perez-Cavero

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