Design Of Monitoring System Of High Voltage Power Transmission Lines Based On ZigBee

With urban development scale increasing in recent years, people need more and more electric energy, and make more and more requirements for the persistence and stability of high voltage power transmission lines. When something wrong happened in the transmission of electric energy, the fault should be found out in the shortest possible time and eliminated to recover power supply for living and production. But it is still relatively backward or high costs for line fault locating despite of the improvement of power network automation.As an emerging wireless technology, ZigBee technology has merits of low cost, high reliability, long distance communication and large nodes capacity. These features can form strong local network. This thesis details its characteristics and the IEEE802.15,4standard which is the international communication protocol used by ZigBee. In contrast to other fault monitoring technologies and wireless communication technologies, ZigBee wireless local networking technology is adopted to monitor high voltage power transmission lines.The fault monitoring system of high voltage power transmission lines in this thesis uses three-tier structure of "Monitoring center-Gateway online-Fault monitoring nodes" and two networks. Fault monitoring nodes and gateway online built short-distance local ZigBee wireless sensor networks together. They are composed of electrical power module by electromagnetic mutual inductance, standby power charging and discharging module, bus-bar current mutual inductance sampling module, wireless communication module of ZigBee, and GPRS communication module. The gateway online can communicate with central server of monitoring center remotely by GPRS packet data technology. PC software is divided into two kinds. Monitoring software receives the data from gateway and stores it to the database. Display software can show the line status in time. This paper mainly presents hardware and software design of the monitoring node and software design of monitoring center. All the devices on lines obtain energy by the mutual inductance, and super-capacitor is used as the standby energy storage element. The charge current can be automatically adjusted according to the current value on lines which will take most advantage of the power from mutual inductance.The fault monitoring system of high voltage power transmission lines is an application example of ZigBee technology. The test results show that this system is stable and has high potential value for practical application. Although this design is based on the fault monitoring system, It also offers a valuable reference for design of other similar wireless sensor networks.