Prof. Haoxi Cong, graduated from the School of Electrical Engineering, Shandong University, with a bachelor's degree in engineering and a doctorate in engineering in 2011 and 2016 respectively; from 2012 to 2016, he visited and studied in the State Key Laboratory of New Energy Power Systems, North China Electric Power University. Mainly engaged in the teaching of circuits and electrical engineering courses, as well as research work in advanced power transmission and transformation technology, electrical equipment intelligence and other aspects. Presided over 2 National Natural Science Foundation projects, participated in the completion of 4 National Natural Science Foundation projects, 1 sub-project of the National High-tech Research and Development Program (863 Program), and a number of scientific research projects of the State Grid Corporation, and published 1 academic monograph, both at home and abroad. He has published more than 50 research papers in important academic journals and conferences. He was selected into the Young Talent Support Program of the Chinese Society for Electrical Engineering, and served as a number of academic part-time jobs, including a member of the IEEE P2869 working group, a member of the CIGRE China National Committee Youth Committee, a member of the China Electrotechnical Society Youth Work Committee, and the IEEE PES Power Transmission and Distribution Technical Committee (China) Member of the Overhead Line Technology Sub-Committee, Youth Editor of the Journal of Insulation Materials, etc.
Speech Title: Motion Characteristics and Dynamic Modeling of Secondary Arc on High-voltage Transmission Lines
Abstract: In view of the unique characteristics of the secondary arc of high-voltage transmission lines, it is necessary to know and understand the arcing characteristics and internal physical mechanisms of the secondary arc. The distribution laws of secondary arc current and post-arc recovery voltage when a single-phase ground fault occurs at different locations along a long-distance transmission line were obtained. Through reasonable simplification, a single-phase equivalent circuit topology was obtained, and the experimental platform and motion characteristics was designed accordingly. A multi-physics field coupled kinetic model of electromagnetic force, thermal buoyancy, air resistance and wind force was established using a chain arc model. Through an in-depth analysis of the formation and motion mechanism of the arc root, the arc root model was incorporated, and the selection method of the optimal length of the current element of the chain arc model was proposed. The validity of the simulation model was verified by comparison with the experiment.