UHV Grid Adaptive Reclosing

Electric energy is a key factor about the overall development of society, and socio-economic development in particular is closely linked. With China's rapid economic growth, demand for electricity is very urgent. However, the distribution of electrical energy has its own characteristics, energy resources are rich in western China, the large demand of electricity is in the eastern developed areas, and the load center is 1000-3000km far away from the power center. The distance is the special economic transmission distance of high voltage power system; In addition, high-voltage transmission and low-loss transmission are two characteristics of the UHV transmission. Therefore, high-capacity and long-distance transmission becomes more and more important, some developed countries such as Russia, the United States and Japan have begun to study and the application of UHV power transmission technology a few decades ago. In January 2009, Our UHV AC pilot project-Jindongnan - Nanyang - Article Jingmen become the first commercial operation of the ultra-high power transmission line in the world.Because high voltage power has High voltage transmission, large line capacity, long transmission distance, its larger and so the reactive power, Its large reactive power and so on.It's necessary to analyze the unique features of the special high-voltage power grid.there are many differences between the special high-voltage power grid and the high pressure systems. Therefore, the study of UHV power grid is very necessary.Reclosing relay, as the main protection of the power grid has been widely applied in the power grid, it has been widely applied In the power grid. It can quickly restore power, Improve grid reliability and continuity. It has a very major significance on the power grid safe and stable operation. However, every coin has two sides, there are so many benefits but at the same time if the reclosing overlap in the on permanent fault, very serious over-voltage would happen, system may also be leaded to crashes, more serious off-axis generator failure, etc. The proposed adaptive reclosing solves this problem.In this paper, the writer analyses fault phase including an arc fault phase arc, the second arc and the recovery voltage. And research the mechanism, mathematical model of an arc, the second arc; Arc of the second phase of harmonic components using transient faults determine is simulated, analyzing their advantages and disadvantages.Finally, this paper presents a voltage by the amount of recovery voltage phase to determine the instantaneous method of fault. This method uses the amount of recovery voltage frequency, the correct high reliability.