Research On Fault Location Complicated Transmission Line

With the rapid economic development in China, electric load growth year after year. So improve grid transmission capacity demand is very urgent. However, the contradiction of transmission corridor construction and protection of arable land resources are very prominent. In order to save transmission corridor covers, the new complex power transmission lines has been widely applied. T-type electric power transmission lines can reduce the radius,and improve efficiency in the use of line. Saving advantages transmission corridor has been widely used in China’s urban power grid interconnection system because of its large transmission line capacity. With the continuous rise of complex transmission lines, many scholars began to fault lines ranging research program.In this paper, the signal transmission lines extracted singular points using a new method of time-frequency atom decomposition. For the same pole double circuit transmission line phase short circuit with the same name can not measure the amount of electrical problems, further proposed dual-mode volume estimation method based on the type of fault.In the transmission line with a T-branch of the line, it is difficult to use single-ended power frequency fault information to achieve fault location under various fault conditions. This paper uses three failures initial wavefront measurement methods to reach the end of the time difference to determine fault slip. Using frequency atomic decomposition singular points of the line to extract the wave surge. The results show that the method of the noise signal is relatively small, it is possible to efficiently extract the signal components of high frequency information. This paper propose dual-mode fault type identification method.The amount of electrical coupling between the lines is so serious, so it is complex and diverse. In this paper, based on a qualitative comparison of classical phase mode transformation matrix analyzing classical transformation matrix inadequate. Using the same line with the T-type atomic decomposition of the above frequency wave head of the fault line singularity extraction. Using PSCAD and MATLAB/SIMULINK power system simulation software for a large number of simulation experiments. Experimental results show that the above-mentioned programs ranging good stability, high accuracy, and is not the fault type, fault location, impact resistance and system operation mode transition changes.