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The growth characteristics of electrical trees under DC and AC voltages are quite different. In order to investigate the influences of AC component in HVDC cable system on the electrical tree properties, the growth and discharge characteristics of electrical trees under AC-DC composite voltages were studied in this paper. The results showed that the AC component greatly accelerated the developing...
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...
There are many failure modes of transformer, and their probability and failure severity differ from each other. Based on the statistic data and experts advice, the probability of all failure modes are calculated, and divided into 5 grades. Meanwhile, IAHP was applied to calculate the weight of the transformer failure information, and Extension evaluation method was employed to create the frame work...
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