Apparatus and method for identifying cable phase in a three-phase power distribution network
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United States of America Patent
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Apr 18, 2006
Grant Date -
Dec 30, 2004
app pub date -
Mar 10, 2003
filing date -
Mar 11, 2002
priority date (Note) -
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Abstract
A line phase identification system and method identifies the phase of a power line at a remote unknown-phase line (160) in a three-phase power distribution network (100). The instantaneous phase of a known-phase line (150) is measured and saved each GPS second using a 1-pps time mark of a GPS receiver (660). The instantaneous phase at the unknown-phase line (160) is measured at a single GPS second using the 1-pps time mark of a GPS receiver (660) and compared to the phase measurement taken from the known-phase line (150) at the same GPS second. The differential phase between these simultaneously taken known and unknown instantaneous phases will be close to either 0, +120, or -120 degrees, thus identifying the line phase at the line under test (160).
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