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The transmission line is the key equipment of power grid, which is the guarantee of stable operation of power grid. Integrating the Internet of things technology into the condition monitoring system of transmission line can improve the monitoring and operation management level of transmission lines. The paper primarily researches the key technologies of Internet of things and condition monitoring of transmission line, and analyzes the architecture of Internet of things. And then, constructs the structure of transmission line condition monitoring system based on Internet of things and researches the function and deployment principle of each layer network. The perception layer adopts a self designed monitoring device. At the network layer, the paper proposes a three-layer network structure of wireless sensor network, optical fiber composite overhead ground wire(OPGW), GPRS and Beidou navigation satellite to construct the network transmission layer of the condition monitoring system, which can meet the mutual inductance and the interconnection between the monitoring devices in the different transmission line environment, and reduce the configuration of terminal GPRS, Beidou navigation satellite and OPGW access point. Finally, the reliability and feasibility of the condition monitoring system integrated the technology of Internet of things are illustrated by practical cases, which provides a set of effective solutions for the safe and stable operation of transmission lines.
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