Protective relay apparatus

Details Protective relay apparatus Protective relay apparatus

1979-10-12

1981-06-23

Miller, J. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 76, 361 87, H02H 300, H02H 726

Patent

active

042754291

ABSTRACT:
Pilot protective relay apparatus for high-voltage, three-phase alternating current transmission lines which provides the functions of an electromechanical pilot-wire protective relay, without the necessity of having a continuous, metallic conductor connected between the points to be compared. The protective relay apparatus is completely solid state, making trip decisions based upon three separate comparisons of the near and far line current conditions represented by line current derived single-phase voltage signals. The three comparisons indicate the magnitude of the phasor difference, the magnitude of the phase angle, and the relative average absolute magnitudes.

REFERENCES:
patent: 2641634 (1953-06-01), Marihart
patent: 3597735 (1971-08-01), Nakayama et al.

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