Application Research Of Intelligent Transmission Line Fault Monitoring System

With the rapid development of Chinese economy, power has increasingly become the economic lifeline of the country, and the safe operation of transmission lines relates to the whole industry and people’s livelihood. Continuous expansion of the regional power grid in recent years, as well as a large grid interconnection, spawned a large number of high-voltage even UHV transmission line, thus the running security of large-capacity and long-distance’s transmission lines is important particularly. In this environment, intelligent transmission line’s fault monitoring system has come into being. The fault-line monitoring system can achieve precise positioning of failure points, an accurate determine of the failure cause, a clear failure type and other functions, reducing greatly the repair time after fault trip and a waste of manpower, material and other resources to improve the reliability of power supply.With continuing expansion of intelligent transmission line fault monitoring system in Chinese power grid radiating, installing intelligent fault monitoring terminals on overhead wires will affect the vibration of the wire, is current research subject. This paper researches and analyses the system application from two perspectives. On the one hand, intelligent fault monitoring terminal will effect wind induced vibration through theoretical calculations and simulations’ analysis. On the other hand, describing the test the fault monitoring terminal will affect the Aeolian vibration and the judgment of failure reason based on engineering and experience analysis. The main research contents are as follows: Firstly, the main architecture of intelligent power transmission line fault monitoring system and the overhead wires vibration theory are briefly introduced. Secondly, this paper compares the theoretical calculation and the form-finding result by ANSYS, verifying the correctness of the form-finding result. Thirdly, it conducts a transient dynamic analysis for transmission lines in different conditions before and after the installation of the wire intelligent fault monitoring terminal by full method. Finally, the paper introduces the impact test between terminal and Aeolian vibration and the judgment of failure cause in the engineering.The main conclusions include the following aspects. Firstly, form-finding analysis result is accurate enough. Secondly, dynamic simulation results show that intelligent fault monitoring terminal is no significant effect on the vibration characteristics of the wire when it is installed in the point 30 meters from the wire hanging. But it has greater impact when locating near the lowest point of sag of wire. Thirdly, the terminal will reduce the damper’s protection limits by the test. Finally, it summarizes the transient characteristics of fault current traveling waves and this can be used as basis for engineering applications.