Cable fault location method with discharge delay compensation using multiple pulses with different rates of voltage increase
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United States of America Patent
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Jun 7, 1994
Grant Date -
N/A
app pub date -
Mar 12, 1992
filing date -
Mar 13, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Two or more rising pulse waves having different rates of voltage increase are applied to a measuring end of a cable and reflected waves from a fault point on the cable are detected to measure a turnaround propagation time between the measuring end and the fault point. Additionally, ratios of the rates of voltage increase of one pulse wave and the other pulse waves are calculated. A discharge delay time at the fault point is calculated from time differences of the measured turnaround propagation time and the ratios of the voltage increasing speeds and the discharge delay time is subtracted from the measured turnaround propagation time to calculate a real turnaround propagation time.
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