How to find the cable fault point quickly and accurately and restore the power supply as soon as possible has become a difficult problem for power supply enterprises. Therefore, a fault detection method based on SSTDR is designed in this paper. The principle of SSTDR technology is analyzed. Based on the distance measurement of signal, the PN code is modulated by cosine signal, which makes the test signal have the white noise characteristic of mean value 0, and has stronger anti-interference ability. It can detect the fault point of low-voltage cable under the condition of low SNR. In the simulation experiment, the fault problems of the low-voltage cable in open and short circuit are detected respectively, which verifies the effectiveness of the SSTDR technology and makes a contribution to the safe use of the low-voltage cable(Abstract).
