Relay for pilot protection of electrical power lines

Details Relay for pilot protection of electrical power lines Relay for pilot protection of electrical power lines

1983-02-22

1985-07-09

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 68, 361 82, 361 64, H02H 318

Patent

active

045286116

ABSTRACT:
New logic circuitry for a directional comparison blocking protective relay scheme. A forward-reaching and a reverse-reaching protective relay located at the local and remote terminals of a protected line segment determine whether a fault is internal or external to the protected line segment. To carry out this function, the protective relays produce signals representative of fault location and communicate with each other via a communications channel. A fault detector and logic circuitry is provided at each terminal for processing the produced signals to determine the fault location and avoid tripping when the fault character changes. By using fault detectors to determine the existence of a fault, the logic at each terminal for combining the signals is simplified and security against false tripping is improved.

REFERENCES:
patent: 3845357 (1974-10-01), Hagberg
patent: 4408246 (1983-10-01), Ray

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