Equipment for and methods of locating the position of a...

Details Equipment for and methods of locating the position of a... Equipment for and methods of locating the position of a...

G - Physics

01

R

324/58.03

G01R 31/08 (2006.01) H02H 7/26 (2006.01)

Patent

CA 1325826

ABSTRACT Equipment for and methods of locating the position of a fault on a power transmission line. 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 VS,VR and current IS,IR 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) utilising the signals and equations of the form: Vf = cosh (Tx) VS - ZO sinh (Tx) IS; and Vf = cosh (T(L-x)) VR - ZO sinh (T(L-x)) IR, where Vf is the fault voltage, T is the propagation constant of the line (7), ZO is the characteristic impedance of the line (7) and L is the total length of the line (7).

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