Equipment for and methods of locating the position of a fault on a power transmission line
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United States of America Patent
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Dec 10, 1991
Grant Date -
N/A
app pub date -
Sep 6, 1989
filing date -
Sep 9, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An equipment for locating the position of a fault (9) on a power transmission line (7) between two ends (11,13) of the line (7) comprising: a voltage (15A,B) and a current (17A,B) sensor located at each end (11,13) of the line (7) for deriving signals representative of the voltage V.sub.S,V.sub.R and current I.sub.S,I.sub.R at each end (11,13); and two interlinked microprocessors (21A,B), one located at each end (11,13) of the line (7), for calculating the distance x of the fault (9) from one end of the line (11) utilizing the signals and equations of the form: V.sub.f =V.sub.s cosh(Tx)-I.sub.S Z.sub.O sinh(Tx); and V.sub.f =V.sub.R cosh(T(L-x))-I.sub.R Z.sub.O sinh(T(L-x)), where V.sub.f is the fault voltage, T is the propagation constant of the line (7), Z.sub.0 is the characteristic impedance of the line (7) and L is the total length of the line (7).
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