Prediction of Conductor Corona Onset Voltage Based on Condensation-Distribution Model under High Humidity Conditions
Hu Qin1, He Gaohui1, Peng Huadong2, Li Yongfu2, Shu Lichun1
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400044 China; 2. State Grid Electric Power Research Institute of Chongqing Electric Power Company Chongqing 401123 China
Abstract：Humidity has a significant influence on the corona onset voltage of conductor.The presented paper constructs a condensation-distribution model based on quadri-thermal resistance heat transfer model and fractal theory under high humidity circumstance, and calculates the dimensions of the maximum dewdrop and the distribution regularities of dewdrop under various conductor temperature and humidity conditions, which are agree with the test results of metallographic microscope. The parameters derived from the condensation-distribution model are used to calculate the electric field intensity distribution of conductors, and input the results of electric field intensity distribution into a corona photoionization model to obtain the corresponding corona onset voltage.The higher of the humidity or the temperature differences between conductor and circumstance, the smaller of the corona onset voltage, and when the relative humidity reaches 80%, the corresponding corona inception voltage tends to saturate. Comparing the prediction results of corona onset voltage with experiments results, the errors are less than 5%. Therefore, the proposed method could be applied on the corona onset voltage prediction of conductors under high humidity circumstance.
胡琴, 何高辉, 彭华东, 李永福, 舒立春. 高湿条件下基于凝露分布模型的导线电晕起始电压预测[J]. 电工技术学报, 2018, 33(7): 1634-1640.
Hu Qin, He Gaohui, Peng Huadong, Li Yongfu, Shu Lichun. Prediction of Conductor Corona Onset Voltage Based on Condensation-Distribution Model under High Humidity Conditions. Transactions of China Electrotechnical Society, 2018, 33(7): 1634-1640.
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