Protection of electrical power lines

Details Protection of electrical power lines Protection of electrical power lines

2005-07-05

2005-07-05

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

Reexamination Certificate

active

06914762

ABSTRACT:
A method of protecting a section of a three phase power line uses superimposed current components in the power line to enable a local relay to detect operation of remote circuit breakers of remote relays in response to a fault on at least one phase of the power line. Line signal transducers output line condition signals indicative of voltage and/or current in the line near the circuit breaker, and a signal processor in the local relay processes the line condition signals to selectively produce a fault signal for opening its circuit breaker after taking account of remote circuit breaker operation.

REFERENCES:
patent: 4352137 (1982-09-01), Johns
patent: 4390835 (1983-06-01), Elkateb et al.
patent: 5825189 (1998-10-01), Johns
patent: 5838525 (1998-11-01), Ward et al.
patent: 6011480 (2000-01-01), Schweitzer et al.
patent: 6601001 (2003-07-01), Moore
patent: 6788508 (2004-09-01), Papallo et al.

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