An Antomatic Monitoring System On Overhead Transmssion Lines

Since its2008winter, provinces of southern have been seriously snow, leading to ice thickness overhead transmission lines reached50-100mm.The conductors, insulators or overwhelmed must be broken or collapse phenomenon occurs repeatedly, resulting in large-area of power supply system can’t work, thus giving rise to a series of problems, affecting the user’s normal life and work.According to the Chinese Meteorological bureau publication "Surface weather observation Standard", the transmission line regelation mainly has3kinds of types:glaze, rime and frozen snow. In the calendar year maximum of transmission line covered with ice,50%-90%is glaze, less areas mainly in the rime.Based on the analysis of transmission line icing and climate relationship and a variety of transmission line icing detection method, using the fiber bragg grating sensing technology design a kind of overhead transmission line icing condition automatic monitor system. The transmission line icing monitoring system instead of artificial transmission line icing can record the icing condition and forecast alarm, so as to reduce the individual labor intensity, reduce the occurrence of accidents probability, improve the operation reliability of lines. Fiber Bragg grating sensors, include the signal sensing unit and the signal demodulation unit. Signal sensing optical fiber as a sensing unit is passive, the demodulation unit is to convert optical signals to electrical parameters.According to the icing wire suffered load equal to the ice load, wind load, as well as its own load balanced relationship between the mathematical model is established. Fiber Bragg grating sensors to measure temperature, strain, wind speed and size of the monitoring points, in order to calculate the total load of the wire, wind load and vertical load. Through relationships with conductors ice coating thickness of ice loads, calculate thickness of ice.With AVR series of8-bit processor ATmega16single-chip machine operator for parametric analysis, extracts for external sources of information, transfer to PC. Use the kingview to write the user interface. The user interface shows the scene of the ice cover, including temperature, strain, wind speed and thickness of the ice cover. The staff may report to the police the value according to the hypothesis, takes the pointed preventing and controlling measure to the correlation line.