Research On Fault Location Of 10kv Countryside Power System

Nowadays, the countryside economy of our country is industrialized and mordernized gradually in our country. There would be a more and more strict requirement of a steady power supply, so the rapid and accurate fault location is a problem must be solved. The study of identifying the fault branch is well-developed at present, but the fault location's research is not good. The common methods of fault location are traveling wave, one-terminal impedance and two–terminal impedance. Because of the characteristics of village distributed network, such as the main line power supply, the multiple branches and the bad running environment, the application is not effective.The paper makes a detailed analysis of the common faults and its characters, combines the present state of fault location study and the characters of village distributed network, identifies the fault branch in fault -port diagnosis way. Since traveling wave fault location is expensive, one-terminal impedance is low in accurate and the communication line of two–terminal impedance is complex, a multi-terminal fault location algorithm is raised in this paper, and a relevant mathematical model is established too. Two-way Power Frequency Automatic Communication System (TWACS) is used in the algorithm, and it has a simple theory. It's not affected by fault resistance nor the fault type. The algorithm has accurate fault location, simple communication equipment, and the signals can cross the transformer derectly.At last, the paper establishes simulation model of distributed network and makes combined experiments in TWACS with Matlab. The results prove that the fault branch identification is correct and the error rate in fault location is lower than 5 00. It shows that the proposed method is feasible.