A High Impedance Grounding Fault Location Method for Transmission Lines Based on Electromagnetic Time Reversal and Harmonics

This paper investigates the influence of arc grounding faults in high impedance ground faults (HIF) on electromagnetic time reversal (EMTR) localization methods. Firstly, two EMTR methods suitable for HIF were reviewed, noting their varying degrees of positioning accuracy reduction in the presence of arc grounding. Subsequently, a method based on low-order harmonics of HIF was proposed to improve the positioning performance of the EMTR method under arc grounding fault conditions. Simulation results demonstrate that this method can achieve accurate positioning in the presence of arc grounding, with a 90% reduction in the required sampling rate. Even at a low sampling rate of 100 kHz, this method exhibits excellent localization performance. Additionally, it significantly enhances noise resistance, allowing for accurate localization even at a signal-to-noise ratio (SNR) of 10 dB.