Study on Thermal Stability of OPGW in Distribution Line During Lightning Striking and Grounding Short Circuit Faults

In order to study the thermal stability and its influencing factors of OPGW under power frequency short circuit fault and lightning fault, a three-dimensional transient temperature finite element simulation model is established in this paper, and the temperature simulation of 8 different types of OPGW is carried out. The results show that the temperature rise of OPGW is low when the single-phase power frequency short-circuit fault occurs in the transmission line. When the two-phase power frequency short-circuit fault occurs in the transmission line, the OPGW produces a higher temperature rise. When the fault time is 100 ms, the aluminum layer temperature reaches 380.39 °C, which exceeds the maximum tolerated temperature of aluminum in OPGW, which may cause the aluminum layer to overheat and melt and fall off, affecting the mechanical and electrical properties of OPGW. When OPGW is subjected to a single lightning stroke, its temperature rise rate is less than that of the two-phase power frequency short circuit fault.