Protection systems for power networks
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United States of America Patent
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N/A
Issued Date -
Aug 28, 2003
app pub date -
Mar 13, 2003
filing date -
Jan 31, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A protection system for an electrical power network uses a method of determining the times of capture of current signals obtained by protection devices (3A, 3B) at first and second spaced points along a power line. Measurements are captured at the first device (3A) and sent to the second device (3B), which captures a second measurement and sends a reply to the first device. The timing of both measurements is synchronised using a GPS signal, and the total propagation time tp1+tp2) of the outward and return signals (S1, S2) is stored in a memory. In the event that the GPS signal is lost, the stored propagation time is used to calculate the actual time of the second measurement relative to the first measurement.
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