Analytic method for fault location of underground power cable

摘要

A method for indicating a fault location of an underground power cable is provided to indicate an error state and a fault location of the power cable by using characteristics of a shielding layer impedance matrix. An impedance per unit length of an underground power cable is received from a cable provider, and a voltage and a current are measured at both ends of the defective underground power cable(S10). An estimated fault location is determined and the voltage and the current are measured at both ends of a power transmission system. Harmonics and distortion components are removed from the voltage and current by using a LPF(S20). The voltage and the current from the LPF(Low Pass Filter) are Fourier-transformed, such that a basic component is extracted(S30). A defective point is determined by using an impedance analysis method using a relation between a voltage and a current of a basic wave(S40).