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2021-08-13

Evaluating and Monitoring Methods of HVDC Valve Radiator Blockage Based on Applied Heat Transfer

By Li Zhang, Mingxing Li, Fan Yang, Wenzhen Li, Hailong Zhang, and Songlin Liu
Progress In Electromagnetics Research C, Vol. 114, 247-262, 2021
doi:10.2528/PIERC21042102

Abstract

Valve radiator blockage is a serious problem endangering the safety of thyristor. At present, there are no effective methods for blockage evaluation and monitoring. This paper analyzes the heat dissipation state of a radiator under different blocking conditions and divides it into abnormal heat dissipation and normal heat dissipation. Then, based on reliability theory, the tolerance index ψ for blockage and the probability index θ for overheating are proposed to evaluate the blockage hazard of the thyristor. Also, the thermal circuit model of the valve group is established to monitor radiator blockage. According to the model, the corresponding relationship between radiator blockage and valve temperature distribution is solved, and the blockage detects index based on device temperature is given to judge radiator block. Through the infrared monitoring temperature solution, judgment of radiator blockage is consistent with the set blockage.

Citation


Li Zhang, Mingxing Li, Fan Yang, Wenzhen Li, Hailong Zhang, and Songlin Liu, "Evaluating and Monitoring Methods of HVDC Valve Radiator Blockage Based on Applied Heat Transfer," Progress In Electromagnetics Research C, Vol. 114, 247-262, 2021.
doi:10.2528/PIERC21042102
http://www.jpier.org/PIERC/pier.php?paper=21042102

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