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The results of a laboratory study on the electrical performance of 1000kV and 500kV post insulators as well as 500kV bushing covered with wet-grown ice were presented in this paper. The tests were performed in a large-scale artificial climate chamber at UHVAC test base of State Grid Corporation of China (SGCC). The ice formed artificially by super cooled water droplets accreted on the energized insulators...
To simulate the special state of ice-covered insulators, the traditional circuit model for insulators flashover was improved by considering the influence of air gaps. Take the energy varying accompany the ice-melting and water vapor into account, Cassie and Mayr differential equations were combined to describe the arc resistance. Based on the dynamic equations of arc resistance and residual ice-layer...
The discharge performance of air-gap and insulator string at high altitude regions is different from that of the referring standard conditions as the relative air density decreases with the increasing of altitude. This difference is one of the key question in engineering design of the external insulation. Since the leakage currents of contaminated insulators comprised a large number of noises before...
The icing flashover characteristics and discharge processes of 500 kV ac transmission line long insulator strings energized in the ice accretion were studied. The influence of pollution and grading rings (including simulated conductor) on heavy ice-covered insulators?? flashover voltage were considered in this paper. Based on the artificial icing test results, it was found that 1) under the severe...
The flashover process during ice-melting period of polluted and ice-covered insulator string was studied by experiment in this paper. Arc development, evolution of leakage current and its frequency representation (FFT) were analyzed. The results indicated that the flashover process can be divided into five stages, named initial stage, intermittence local arc stage, arc propagation stage, critical...
In the present paper, study on icing flashover characteristics were carried out in artificial climate chamber of State Grid Electric Power Research Institute (SGEPRI) with XWP2-160 porcelain double sheds suspension insulators. According to IEEE Task Force on insulator icing test methods the natural freezing rain condition was simulated and 3 to 7 units XWP2-160 insulators were icing energized at service...
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