| 引用本文: | 王艳,刘美岑,陈旭,刘俊德,焦彦军.中性点不同接地方式下混压部分同塔双回线路故障分析[J].电力自动化设备,2018,(10): |
| WANG Yan,LIU Meicen,CHEN Xu,LIU Junde,JIAO Yanjun.Fault analysis of mixed voltage double-circuit lines partly on same tower under different grounding modes of neutral point[J].Electric Power Automation Equipment,2018,(10): |
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| 摘要: |
| 在序分量法的基础上，对变电站近区出现的中性点直接接地和非直接接地混压部分同塔双回线路跨线故障进行分析。消除混压同塔线路间的零序互感，将系统解耦为综合正、负、零序网；根据三绕组变压器接线方式对综合正、负、零序网的公共阻抗部分进行幅值与相角的校正，得到中性点不同接地方式下混压部分同塔双回线路的独立六序网；根据故障类型列出故障点边界条件，通过复合序网及求解方程组得到故障点短路电流。通过PSCAD软件对一中性点不同接地方式混压部分同塔双回线系统(220 kV/110 kV/35 kV)各种故障进行仿真验证，结果表明所提故障计算方法的精确性及实用性。 |
| 关键词: 中性点接地方式 混压部分同塔双回线 三绕组变压器 六序网 跨线故障 |
| DOI：10.16081/j.issn.1006-6047.2018.10.025 |
| 分类号:TM76 |
| 基金项目:中央高校基本科研业务费专项资金资助项目(2016 MS90) |
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| Fault analysis of mixed voltage double-circuit lines partly on same tower under different grounding modes of neutral point |
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WANG Yan1, LIU Meicen1, CHEN Xu1, LIU Junde2, JIAO Yanjun1
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1.Department of Electrical Engineering, North China Electric Power University, Baoding 071003, China;2.State Grid Anshan Power Supply Company, Anshan 114001, China
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| Abstract: |
| Based on the sequential component method, the inter-line fault of mixed-voltage double-circuit lines partly on the same tower in neutral point directly grounding and indirectly grounding systems near substations is studied. Firstly, the zero-sequence mutual inductance between mixed-voltage double-circuit lines partly on same tower is eliminated, and the system is decoupled into comprehensive positive ，negative-and zero-sequence networks. According to wiring mode of three-winding transformers, the amplitude and phase angle of common impedance parts of the comprehensive positive-,negative-and zerosequence networks are corrected, and the independent six-sequence network of mixed-voltage double-circuit lines partly on the same tower under different grounding modes of neutral points is obtained. The boundary condition of fault point is listed according to the fault types, and the short circuit current at fault point is obtained by the composite sequence network and its solution equations. Different types of faults in mixed-voltage(220 kV/110 kV/35 kV) double-circuit lines partly on same tower in neutral point directly grounded and indirectly grounded systems are simulated with PSCAD software, and the simulative results verify the accuracy and practicability of the proposed method. |
| Key words: neutral grounding modes mixed-voltage double-circuit lines partly on the same tower three-winding transformer six-sequence network correction inter-line fault |
