Analysis of Reclosing Overvoltage in Cable-Overhead Line Hybrid Line Based on Return Circuit Theory in Modal Domain
Li Jiaming1, Xu Long1, Deng Junbo1, Zhang Guanjun1, Pu Lu2
1. State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University Xi’an 710049 China; 2. Electric Power Research Institute of State Grid Shanxi Electric Power Company Xi’an 710100 China;
Abstract The amplitude and dominant frequency characteristics of reclosing overvoltage with different cable proportions in cable-overhead hybrid line were studied based on the wave propagation in modal domain. The propagation constants of 10kV cable and overhead line (OHL) in modal domain circuit were obtained through modal transformation. Using electro-magnetic transients program (EMTP), an asymmetrical line model was established, and the variation tendency of statistical overvoltage under different cable proportions was investigated. The results show that statistical values vary non-monotonically and a minimum value appears when the cable proportion increases. The results based on voltage propagation in modal domain are consistent with those calculated by EMTP. This method can also be applied in hybrid lines with different proportions since the propagation constants are not influenced.
Li Jiaming,Xu Long,Deng Junbo等. Analysis of Reclosing Overvoltage in Cable-Overhead Line Hybrid Line Based on Return Circuit Theory in Modal Domain[J]. Transactions of China Electrotechnical Society, 2020, 35(8): 1754-1763.
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2020, Vol. 35 
