架空输电线路实时暂态载流能力及其风险水平的计算研究

With the continuous increase of power load, how to increase the capacity of transmission line within the safety range is an urgent problem to be solved at present. The transient ampacity of the transmission line is an important parameter of the dispatching of power Network load dispatch or failure. Based on the transient heat balance equation, this paper presents a transient thermal rating method for transmission lines. Based on the real-time meteorological conditions of a 500kV transmission line in Zhejiang Province, the transient and steady-state ampacity and the influence of different factors on the transient ampacity are studied and analyzed. Finally, the statistical analysis method was used to obtain the cumulative distribution function of the transient and steady-state ampacity of the line throughout the year, and to determine the value of the ampacity at different risk levels, whichRResearch on ResearchStudy of Real-time Transient Ampacity and Risk Level of Transmission Lines on Transient Ampacity and Risk Level of Overhead Transmission LinesReal-time Transient ampacity and Risk Level of Overhead Transmission Linesesearch on Real-time Transient ampacity and Risk Level of Overhead Transmission Lines provided reference and basis for the operation scheduling of the line. The result shows that transient ampacity based on real-time meteorological conditions can significantly increase the capacity of the transmission line, but with greater capacity, the risk level becomes greater.