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Under the existing 3/2 connection mode, the incompletion between the configuration of the protection and transformer leads to the existence of the dead zone. When the fault occurs in the dead zone, line protection and breaker failure protection are generally matched with each other to achieve the complete isolation of the fault. This approach will make the scope of the circuit breaker to expand, and...
All along, countries of the world have adopted different methods to guarantee the operation security of power system. However, there were still a lot of large-area power outages in the world recently, which causing enormous economic losses. It indicates that the existing methods cannot completely guarantee the security of power system, and there is an urgent requirement to find new ways as a supplement...
Early in 2008, some areas in southern China (especially Guizhou, Guangxi, Yunnan and Guangzhou Provinces) experienced extreme low temperature, heavy rain, snow, and freezing weather, which seriously damaged the power system. Based on the general disaster situation, this paper describes characteristics of local power grids in each province and the processes through which they broke down. Some detailed...
In the beginning of 2008, southern China had experienced extreme low temperature, heavy rain, snow, and freezing weather. This extreme weather had impaired the southern area power grid greatly and threatened the security and stability running of power system and power supply. The paper introduces the China southern area power grid basic disaster situation. Based on the China southern area power grid...
The protection device is the assurance for high temperature superconducting (HTS) cablepsilas safe operation in power grid. The paper introduces a protection device for HTS cable, which provides both functions of protection and monitoring. In this paper, hardware structure of the protection device and the protection scheme are presented, then a thermal balance model of HTS cable on quench is proposed,...
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