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It is necessary to restrain the electric field near some civic facilities in the earth, such as gas pipes, communication cables, and so on, if a grounding device is buried nearby. This paper proposed an approach to restrain the electric field by building an underground insulating wall between the grounding device and the facilities. The leakage current from the grounding device can be forced to bypass...
In power grid, higher is the voltage level, longer is the composite insulator string, uneven is the potential distribution, especially the sheds near the conductor, its withstand voltage is several times higher than other sheds. For the electric field strength of composite insulator at high end is high, it is easy to produce corona which resulted in insulator degradation, life shortening and acid...
Operation of Disconnecting Switch (DS) and Circuit Breaker (CB) can produce very fast transient overvoltage (VFTO) in GIS. During the transmission process of VFTO in GIS, as the backflow route of VFTO, corresponding high frequency interference can be induced on the shell of GIS. High-frequency interference's entering into grounding network can cause transient ground potential rise (TGPR), resulting...
The transient voltage distribution on the core wire and outer semiconductor layer of the XLPE cable winding which is under lightning surge is discussed. The transient voltage with certain amplitude on the outer semiconductor layer of the cable winding would be measured because of the special characteristics of the cable winding structure, which is very different with transient characteristics of the...
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