Mountainous Regions Of Rural Power Network Overhead Line Fault Location Technology Research

At present, the single-phase earth and the short circuit faults always occur in the countryside power system with many branch lines and complex condition. But the fault localization mainly dependences on the primitive artificial patrol along the transmission line, which is hard sledding and time-consuming, and also can hardly guarantee the security and stability of the power supply system which will result in the poor reliability of the power supply. With the improving of the automatic degree of power system, the new request to the fault localization is also increasing.On the basis of thoroughly studies in the domestic and foreign technology on the fault localization of the power circuit, this article combines the actual situation of the 10 thousand volt power system belonged to Yunnan province Wenshan electric power company with the single-phase earth and the short circuit faults condition, constructs a real-time and efficient fault localization system for overhead line with independent technology of self-coding to fault point. The system makes use of mature fault localization technology to measures the fault point accurately, encodes the position the line pole near to the fault point, carries on the codes to the information receiver through the power line. Then the FPGA system which composes the receiver will process the signal transmitted through the power line, revert the position code and realize the localization, demonstration and real-time report of the fault point.Compared with traditional fault localization technology, the fault position encoding method used in this paper overcame the shortcoming of impedance and traveling wave method which have only obtained the distance between the fault point and measurement point and were not suitable for the countryside power system with many branch lines and complex condition. The system in the paper applied the power line carrier method which has been widely used on low pressure transmission line but had many problems because of the bad channel environment to the 10 thousand volt middle pressure transmission line. At the receiving part, we applied the Field Programmable Gate Array to form the receiver system. The technical route of hardware-based software programming was adopted and also the data storage, information processing and the serial port transmission module were designed with the pure hardware mode, which has guaranteed that the system was fully real-time.The first part of the article was introduction, which began with the analysis to the common overhead line fault localization technology. We discussed the short-and-long and applicable scope of each method, analyzed the domestic and foreign research status quo and presented this new system designed in the paper after pointing out the questions of present fault localization technology existed in the 10 thousand volt middle pressure transmission line in the multi-mountainous region area. The second and the third chapter formed the second part of the paper, which introduced the power line carrier and the FPGA embedded technology applied in the paper. The third part was composed with the fourth and the fifth chapters. In this part, we elaborated in software and hardware design of the whole system. The last part, also the sixth chapter of the article, summarized the whole text and forecasted the future of the fault localization technology.This article is linked to one of the innovation fund tasks for graduated students of Kunming University of Science and Technology—"The Design of fault localization device on the 10 thousand volt middle pressure transmission line". The research and application carried on in this article may provide a good model and contribute to the fault localization and detection for the similar region and would have certain practical significance.