Application of Online Monitoring Technology of Transmission Lines in Interconnection Project from Qinghai to Tibet
In consideration of climate,geology,city distribution and other factors along the Qinghai Tibet line,there is a potential safety hazard for the transmission line.Thus,we proposed that online monitoring devices should be installed in accident prone areas,including Tanggula mountain pass section,Kunlun channel and Buqu channel,the main disaster prone areas along the transmission line.The online condition monitoring devices(CMDs) adopt new types of sensors with high precision to collect field data,and they can timely monitor weather information(wind speed,wind direction,rainfall,sunshine,and air pressure) and operation status information of transmission devices such as conductor,insulator,tower,and so on.The devices have two power supply modes,solar energy combined with accumulator,and using current transformers to attain energy from buses,and they operate in a communication mode of "optical fiber communication first,wireless access supplemented";both the power supply mode and the communication mode ensure the stable and efficient data transmission of the CMDs.Analyses of the operation data show that the temperature of transmission lines changes obviously at different sites and time periods while that of the grounding lines shows no difference,and that the transmission towers operate well without any abnormal inclination.Moreover,the CMDs can monitor transmission lines' status for a long time,and realize the intelligent monitoring of line operation.It can be concluded that installation of online monitoring devices can realize hazard warning to guarantee safe operation of the lines and can provide information for condition based maintenance of the lines.