Abstract
By the help of on-line monitoring devices installed on transmission lines, the conductor temperature, environment temperature, wire current and sunshine intensity are monitored in real-time. Developing dynamic rating system can effectively and safely raise short-term transmission capacity of transmission lines to satisfy the demands for power supply under emergency state of power grid. In this paper, by the analysis of the principle, structure, and functions of transmission line dynamic rating system, the risk aversion strategy are derived based on the simulated research and field test data to improve the ampacity of transmission lines. The proposed methods such as safety current under the limited time and safety operation time under the limited current provide feasible measures for dynamic rating of transmission lines.
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