Patent ID: 8547105

Claim:
A system for detecting a location of fault in a cable, the system comprising: a cable, transmitting a fault current; a current transforming unit, connected to the cable and receiving the fault current and detecting an original signal of fault current; a detecting unit, detecting a first detail signal and a second detail signal from the original signal of fault current, the first detail signal and second detail signal being detail components in a high frequency band; a comparing unit, receiving the first detail signal from the detecting unit, and comparing the first detail signal with a preset reference value and determining a fault in the cable; and a signal filtering unit, receiving the first detail signal and the second detail signal from the detecting unit, and generating a first filtering signal and a second filtering signal by use of the first detail signal and the second detail signal and outputting a fault detection signal based on a result of comparing the first detail signal with the second filtering signal, wherein the detecting unit detects a first approximation signal and the first detail signal by applying wavelet transform to the original signal of fault current, and detects a second approximation signal and the second detail signal by applying wavelet transform to the first approximation signal.