Reach-measurement method for distance relays and fault locators on series-compensated transmission lines using local information
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United States of America Patent
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Jan 1, 2002
Grant Date -
N/A
app pub date -
Nov 17, 1998
filing date -
Nov 17, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A reach-measurement method is used in connection with a series-compensated line of a power system. The series-compensated line includes an installed series capacitance having a bus side and a line side, and a non-linear protection device parallel to the installed series capacitance. The series-compensated line has a line current, a bus side voltage, and a line side voltage. The series capacitance and the non-linear protection device have a capacitance voltage thereacross equal to the bus side voltage minus the line side voltage. In the method, a number (n) of line current samples are measured, where such samples are representative of values of a line current waveform at successive instants of time on the series-compensated line. Capacitance voltage values are computed based on the measured line current samples in accordance with an equation which takes into account the non-linear protection device parallel to the installed series capacitance. A prescribed power system function is then performed based on the computed capacitance voltage values.
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