Research on high-voltage cable fault location technology for renewable energy stations considering the impact of cable accessories

Timely localization of high-voltage cable faults within the renewable energy station is critical for ensuring reliable operation of the facility. The collector system of a new energy station consists of cables and overhead lines. Due to factors such as remote locations, limited manpower, and constraints in diagnostic techniques, cable fault localization typically requires considerable time following a fault occurrence. As the majority of cables are direct-buried, the accuracy of fault localization directly impacts the duration of fault restoration. Among existing fault location techniques, traveling wave methods are predominant; however, issues in traveling wave fault location for high-voltage cables remain incompletely resolved. This paper proposes a technique for precisely extracting the pulse arrival time based on the short-time matrix pencil method, achieved through the modeling of high-voltage cables and research into digital signal processing methods for fault location signals. Experimental results have shown that this method reduces the average error percentage by approximately 3.5%.