Abstract
Composite insulators will suffer different degrees of insulation aging phenomenon due to long-term internal and external overvoltage and complex environment and other factors, which will seriously threaten the normal operation of transmission lines. In this paper, a method for detecting the aging state of composite insulators is proposed based on microwave transmission. According to the 10 kV composite insulators and its aging law, the numerical simulation models of insulators with different aging states are constructed. Through the fixed frequency scanning at different positions with the rectangular waveguide, the best-fixed frequency detection method is determined by comparing and analyzing the amplitude variation law of S21 (scattering parameter). Considering different degrees of aging, the detection effect of microwaves on the overall aging of composite insulators was studied by moving waveguide detection method. The results show that when the waveguide is transverse and the scanning frequency is 17.695 GHz, the detection effect of different aging states of composite insulators is the most significant. The research results are of great significance to the field of composite insulator aging state detection and evaluation.
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