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Audible noise of high voltage direct current (HVDC) transmission lines is a significant parameter for electromagnetic environment and has caused wide public concern. In order to offer a comprehensive statistical evaluation of audible noise for HVDC projects, a continuous test platform of audible noise considering various weather conditions has been built to record automatically. The long-term statistical...
Transmission lines exposed to the atmosphere in long terms may get easily affected by wind, icing and other factors which may lead to jumping and galloping, reduce the inter-phase clearance and cause flashover as a result. To avoid these, this paper applies polymeric material insulator to the line-to-earth, which means some spot through the span is linked to a ground anchor by the specialized polymeric...
Composite insulators have been widely used in power system since 1970s. However, silicon rubber insulators at high altitude and in strong ultraviolet radiation condition have an exponentially increasing failure rate because of the aging failure. Meanwhile, silicone rubber insulators are not allowed to be stampeded on, which is inconvenience for installation and maintenance. A new type of insulator...
In this paper the statistical analysis for the causes of outdoor insulation accidents of AC and DC high-voltage transmission lines in China were described. This paper focuses on lightning strike, pollution flashover, icing, birds-caused damage, and other factors which may damage the safe operation of power transmission lines. This paper also analyzes the service situation of insulators, the reasons...
Chusui dc transmission line is the world's first ±800kV transmission line in China. 2011 March, gossans of ceramic insulators on ±800kV Chusui dc transmission line appeared electrochemical corrosion at Qujing region in Yunnan province. The corrosion phenomenon concentrated in V-string insulators on negative polarity side. This article describes the basic electrochemical corrosion situation of ceramic...
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