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Due to the corrosion problem, there emerge various fracture phenomena for composite insulators on several 500kV AC transmission lines in China, which has caused serious threat to the normal operation of power system. Therefore, it is urgent to analyze the fracture mechanism and propose feasible evaluation method for the failure of composite insulators. In this paper, appearance observation, water...
Earlier calculations of geomagnetically induced currents (GICs) in Chinese power grids have mainly concentrated on the highest voltage-level system whose geomagnetic risk is considered to be the largest, thus ignoring secondary voltage-level systems. With the 1000-kV system being newly added to China's power system, it is significant to figure out the interaction between GIC in the 500 kV [extremely...
During geomagnetic storms, the geoelectric field drives currents in transmission grids, railway system and pipelines. These geomagnetically induced currents (GIC) threaten the safe operation of equipment. The GIC recordings show that geological structure has significant implications for GIC in power gird (Liu Chunming et al. 2009). In the region with complex geological structure, the horizontal change...
Along with the UHV construction scheme, China will form a large number of transmission lines which have the characteristics of the ultra-high voltage, large-capacity, longdistance. Because the UHV power grid transmission line parameters and the structure of the grid and the transformer are different from the other power net, Geomagnetic storms will affect the UHV power grid more, the work have important...
Extra high voltage DC transmission is planned for the many power corridors of the continental African grid. These lines will traverse the countryside and will pass over many rural and urban communities. These communities will in general have no formal access to grid electrical energy. Access to electrical energy for the basics of light and heat will provide a better quality of life for all. It is...
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