A Study On On-Line Short Circuit Fault Locator For Overhead Power Transmission Line

Power system is a big system which is comprehensive, including generating power, transmitting power, providing power and user. Until now, power system has been an indispensable component of national economy and people's life. With the amplification of the scale of power system, overhead and distant power transmission line becomes increasingly more. Overhead t power transmission line distributes widely, stretches over the areas where the topography is complicated, the climate is variable. Thus all kinds of faults inevitably take place because of long-term exposure in the natural environment.The accurate fault location for high voltage transmission line is one of the effective ways which guarantee the safe and steady work of the power system, hence the development and general situation of the research in this field in China and other countries is reviewed in this paper. According to the differences of the adopted line model, the principles of location , the measured and measurement equipment, all the existing algorithms can be classified into three main methods: traveling wave method, single terminal location and two terminal location. This paper makes a study of the simple fault detecting of oil field power system realizing by computer, proposes to apply the theory of traveling wave location and has the clarity of mathematical model concept and high automation. To the power delivery system with many emitting branches, it has a practical sense to save computer operation period and memory, making software design and simulation. The theory mentioned in this paper is a kind of traveling wave method. It overcomes the limitations in theory and short-comings of big errors, realizes the fault's checking system by a PC bus industrial control computer, adopts swift A\D translation .monitoring on-off switch, warning device when the fault appears.