| 引用本文: | 王丙东,蔡蕾,董旭,等.中性点不接地系统非对称短路故障分析[J].电力系统保护与控制,2017,45(3):149-153. |
| WANG Bingdong,CAI Lei,DONG Xu,et al.A comprehensive analysis for asymmetrical short-circuit fault of electric power system with neutral-point unground[J].Power System Protection and Control,2017,45(3):149-153 |
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| 中性点不接地系统非对称短路故障分析 |
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王丙东1,蔡 蕾2,董 旭1,李贺桥1,王浩轩1,刘 灿1,张好勇1,王龙宇3
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(1.廊坊供电公司，河北 廊坊065000;2.国网天津市武清分公司，天津 301700; 3.冀北电力有限公司检修分公司, 北京102488)
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| 摘要: |
| 为提高分布式电源接入配电网的可靠性，以对称分量法为基础，重点分析了中性点不接地系统各种短路故障特性。给出了单相接地短路、两相相间短路、两相接地短路以及各种经过渡阻抗短路时故障点系统电压、电流的变化特性。得出中性点不接地系统两相相间短路与中性点接地系统一致，且不发生中性点漂移。而中性点不接地系统两相接地短路与中性点接地系统两相相间短路一致，但发生中性点漂移。所得结论能够为分布式电源接入配电网后的短路故障分析以及继电保护整定提供理论参考。 |
| 关键词: 中性点不接地 配电网 短路 电容 漂移 |
| DOI：10.7667/PSPC160115 |
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| A comprehensive analysis for asymmetrical short-circuit fault of electric power system with neutral-point unground |
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WANG Bingdong1,CAI Lei2,DONG Xu1,LI Heqiao1,WANG Haoxuan1,LIU Can1,ZHANG Haoyong1,WANG Longyu3
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(1. Langfang Power Supply Company, Langfang 065000, China;2. State Grid Wuqing Power Supply Branch, Tianjin 301700, China;3. Maintenace Branch, Jibei Electric Power Corporation, Beijing 102488, China)
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| Abstract: |
| In order to improve reliability about distributed generation access into power system, this paper provides an intensive analysis for fault characteristics of neutral-point unground based on method of symmetrical components. It presents the variation feature of voltage and current for single phase to earth, phase to phase short circuit and two-phase grounding together with transition impedance. The result is that phase to phase short circuit of neutral-point unground is the same as neutral-point grounding with neutral-point undrift. However, two-phase grounding is the same as phase to phase short circuit of neutral-point grounding with neutral-point drift. The conclusions could be applied in contingency analysis and protection setting in real distribution system within distributed generation. |
| Key words: neutral-point unground distribution system short-circuit capacitance drift |
