| 摘要 |
The present invention relates to a method for locating a fault (F) in a section of parallel transmission lines in a network comprising the steps: measuring the currents and voltages of both lines at a measuring point arranged at one end (A) of the section, determining the fault distance (x) between the measuring point and the fault as a solution of an equation Ax2-Bx+C-Rf=0 comprising the fault distance (x) as a variable and the fault resistance (Rf), the invention is characterizsed in that the parameters (A, B, C, D) comprise the phase components of the locally measured currents and voltages and are obtained from calculating from the measuring point to the fault location along the both parallel lines, and wherein the equation is resolved into its real and imaginary parts:<paragraph lvl="0"><in-line-formula>Real(A)x2-Real(B)x+Real(C)-Rf=0</in-line-formula><paragraph lvl="0"><in-line-formula>Imag(A)x2-Imag(B)x+Imag(C)=0,</in-line-formula>whereby the fault distance is derived from the imaginary part.
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