Cross-Voltage Short-Circuit Calculation of Mixed-Voltage Double-Circuit Lines Partly on the Same Tower
Zheng Tao1, Zhang Jiaqin1, Wu Dan2, Huang Shaofeng1, Wang Xiaoli3
1. State Key Laboratory of New Energy Power System North China Electric Power University Beijing 102206 China; 2. Nari Technology Development Limited Company Nanjing 211106 China; 3. Ningxia Electric Power Company Yinchuan 750001 China
Abstract：Mixed-voltage multi-circuit transmission lines can be classified into two types：totally on the same tower and partly on the same tower. Due to its special construction form, cross-voltage fault occurs from time to time. In terms of the latter, an improved method of short circuit calculation of cross-voltage faults on mixed-voltage double-circuit transmission lines is proposed in this paper based on the theory of multiple fault analysis, and the first type can be regarded as a special case. First, consider the cross-voltage fault as the multiple faults of the system. The equivalent two ports network of each sequence can be obtained through the simplification. Second, the fault reference phase is selected and the boundary conditions which are decomposed into symmetrical sequence components of fault reference phase are analyzed for different cross-voltage faults. Furthermore, according to the difference between fault phase and reference phase, the composite sequence network is drawn by using ideal transformer to connect the two ports network of each sequence. And, the fault current can be obtained based on the composite sequence network. Finally, fault model of 500 kV/220 kV mixed-voltage double-circuit lines is constructed in PSCAD. Simulation results verifies the accuracy of this method.
郑涛, 张嘉琴, 吴丹, 黄少锋, 王小立. 混压部分同塔双回线跨电压故障短路计算[J]. 电工技术学报, 2018, 33(11): 2496-2507.
Zheng Tao, Zhang Jiaqin, Wu Dan, Huang Shaofeng, Wang Xiaoli. Cross-Voltage Short-Circuit Calculation of Mixed-Voltage Double-Circuit Lines Partly on the Same Tower. Transactions of China Electrotechnical Society, 2018, 33(11): 2496-2507.
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2018, Vol. 33 
