The Research On Transmission Line Monitoring System Based On Wireless Sensor Network

Transmission Line is a very important part of power facilities which are important economic infrastructures. Monitoring the running condition of Transmission Line and getting rid of all kinds of security risks are necessary to ensure the safe and stable operation of the electric power system. Light protection design is one of the important factors that determine the reliability of Overhead Transmission Line. Tower grounding resistance directly affects the lightning withstand level and Trip-out Rate of Transmission Line. Transmission conductor galloping may not only cause damage to the fittings but also interphase flashover, when it gets severe the transmission conductor may be broken and the tower will be pulled down, which pose a threat to the safe and stable operation of Transmission Line.Security check on Transmission Line is currently taking by the workers operating in the field which is high labor intensive, low working efficiency and artificial influence factors in the measurement results can not rule out. More important, the staff can not find the problems in the first time, and then lay the hidden trouble to the Trip-out and conductor galloping.Aiming at these problems, the tower grounding resistance measuring method and conductor galloping monitoring means is studied on basis of analyzing domestic and international Transmission Line monitoring ways. Considering the lacks of available methods, an algorithm of measuring the tower grounding resistance on-line is proposed which reduces the worker’s labor intensity and improves the efficiency. There are lots of researches on conductor galloping at home and abroad but few on the leading wire galloping. The sag of the leading wire is bigger than the conductor which makes it is more easily to gallop, so an inertial measurement unit is used to monitor the leading wire galloping in this paper and the accuracy is improved with data fusion.Wireless Sensor Network is a new type of monitoring network emerging in recent years, the nodes in this network has a small size, the capacity of communications and computing. Each node in the area being monitored can acquire the parameter that the users interested in and sent it to the owner in the form of wireless. Wireless Sensor Network expands the existing network’s function and provides a new way for human perceiving the objective world.The node in the ZigBee wireless networks has a low power consumption and cost feature while the data rate is low and communication distance is short, which are different from the existing wireless communication technology. The ZigBee technology can coordinate thousands of mutual communication between its minor nodes and it is easy to develop thanks to the low complexity. The low cost and small power consumption of the ZigBee node make the slather use it becomes possible.In this paper, transmission line monitoring system based on wireless sensor network is designed using computer, embedded, wireless sensing and data acquisition technologies, remote monitoring the tower grounding resistance and leading wire galloping of Transmission Line is accomplished, while the deficiency that security check on Transmission Line should be taking by the workers operating in the field is solved. This system strengthens the power sector’s control ability of the grid operation and provides a modern management tool for the safe and stable operation of Transmission Line. The trial operation of Transmission Line monitoring system based on wireless sensor network is completed and the results indecate that the system performance meets the design requirements.