基于電導電流測試的復合絕緣子傘裙材料老化特性研究
[Abstract]:In view of the extensive application of composite insulators in power systems and the increasingly serious aging problem, the assessment of their aging status becomes particularly important and urgent. An accurate and reasonable method for evaluating the aging state is of great significance to the safe and stable operation of power system. The electrical conductivity analysis based on insulating material has been applied to the evaluation of aging state of polyethylene, polyimide and other materials, but its application in the assessment of aging state of composite insulators has not been reported. In this paper, a new method for evaluating the aging state of composite insulators based on conductivity current measurement of silicone rubber materials is proposed, and the feasibility of this method to evaluate the aging state of insulators is deduced theoretically. The aging characteristics of composite insulators in operation are analyzed. Taking the artificial accelerated aging test and the field operation of composite insulator as the research object, the conductance current, hydrophobicity, scanning electron microscope and infrared spectrum analysis of the composite insulator were studied. Based on the insulator in the artificial accelerated aging test, the feasibility of evaluating the aging state of the insulator based on the conductance current test is explored, and the location and running life of the umbrella group are explored based on the composite insulator operating in the field. The influence of environmental pollution and operating voltage on the conductivity characteristics of silicone rubber materials. The measuring device of conductance current of insulating material was designed, and the dimension parameters and preparation scheme of the sample were determined. The test results of the properties of the insulators in the artificial accelerated aging test show that the electrical aging threshold of the unaged samples is about 10 k V/mm, and the electrical aging threshold of the samples after 10000 cycles of artificial accelerated aging is about 8.0 k V/mm. The electrical aging threshold was about 6. 5 k V/mm after 20000 cycles of artificial accelerated aging. The longer the aging time is, the more serious the aging time is, the larger the conductivity current is, the lower the electric aging threshold is, and the deeper the trap level is. The aging characteristics of composite insulators in field operation are studied. The results show that when the insulator string has a high distribution of field strength, the insulator with long operating life and the insulator with serious environmental pollution in the operating area, the electrical aging threshold of the parachute group material is lower. The conductance current is larger and the number of internal traps is more, and the influence of operating voltage level on the aging degree of insulator is small. The measurement of conductance current is consistent with the static contact angle measurement, scanning electron microscope analysis and infrared spectrum analysis to evaluate the aging state of the sample. The results show that the electrical aging threshold and its related parameters can be used to evaluate the aging state of composite insulators and to accurately reflect the ageing characteristics of composite insulators in field operation. It is possible that the electrical aging threshold can be used as a new criterion for evaluating the aging state of composite insulators.
【學位授予單位】:華北電力大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TM216
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