Protection of electrical power lines
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United States of America Patent
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Jul 5, 2005
Grant Date -
Jul 31, 2003
app pub date -
May 3, 2002
filing date -
May 3, 2001
priority date (Note) -
Expired
status (Latency Note)
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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.
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