Whether the High-Voltage Transmission Lines Have Enough Load Capacity After Wildfire

Wildfire which caused by a variety of reasons seriously affects the safe and stable operation of the high-voltage transmission lines, and the load capacity research of the high-voltage transmission lines after wildfire is particularly important. In the experiment, the average tensile force of three kinds of aluminum cable steel reinforced (ACSR), which are new, actually burned by wildfire and burned by simulated wildfire with firewood, respectively, is tested. The results show that the safety value of load capacity of the transmission lines is 15 kN. In the case where the horizontal span, height difference, and the maximum sag are known, the lowest point’s horizontal tension of arc sag of the high-voltage transmission lines can be calculated. If it does not exceed 15 kN, even if the transmission lines subjected to wildfire, load capacity is greater than the tension of transmission lines. So it can usually operate safely. If the lowest point’s horizontal tension exceeds 15 kN, in the process of design and installation of the high-voltage transmission lines, by properly increasing maximum arc sag of transmission lines, the tension of the lowest point of arc sag is not more than 15 kN.