Method of detecting fault extinction during a three-phase...

Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit automatically reconnected only after the fault is...

Reexamination Certificate

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Reexamination Certificate

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07961445

ABSTRACT:
A new method for three-phase reclosing of transmission lines is disclosed. According this method, after the type of fault is identified and the faulted line is opened for all three phases from both ends, fault extinction is recognized by comparison of amplitudes and angles of voltages induced at opened phases with predetermined settings. The transmission line is reclosed after the fault is found to be extinguished.

REFERENCES:
patent: 3529174 (1970-09-01), Smith
patent: 4398255 (1983-08-01), Premerlani
patent: 4506210 (1985-03-01), Chase
patent: 4649821 (1987-03-01), Marshall et al.
patent: 5402072 (1995-03-01), Chiang et al.
patent: 2002/0186106 (2002-12-01), Miller
patent: 2004/0027747 (2004-02-01), Kim et al.

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