| 110kV变压器中性点过电压的计算及其保护策略 |
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| 引用本文： | 于化鹏,陈水明,余宏桥,杨鹏程,印华,吴高林.110kV变压器中性点过电压的计算及其保护策略[J].电网技术,2011(3):152-158. |
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| 作者姓名： | 于化鹏 陈水明 余宏桥 杨鹏程 印华 吴高林 |
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| 作者单位： | 电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系);重庆电力科学试验研究院; |
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| 摘 要： | 为了限制短路电流和满足继电保护整定的需要,110 kV系统采用的是部分变压器中性点接地方式,这种接地方式会使不接地变压器的中性点产生过电压。为此使用PSCAD/EMTDC软件计算了重庆电网一个110 kV系统中不接地主变中性点的过电压。计算结果表明:不接地变压器中性点的工频暂态过电压最高可达到125.8 kV;不接地系统下发生单相接地故障时,变压器中性点电压会上升到相电压;非全相运行时空载变压器中性点可能会产生铁磁谐振过电压,峰值可达到261.2 kV,严重威胁中性点和线端设备的安全;雷电过电压也会损坏中性点的绝缘,也需加以限制。最后给出了适用于110 kV变压器中性点的保护配置方案,并指出当采用间隙和避雷器并联保护时,需考虑避雷器对中性点工频暂态过电压的限制作用。
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| 关 键 词： | 中性点 变压器 避雷器 间隙 工频过电压 雷电过电压 |
Calculation of Overvoltage on Neutral Point of 110 kV Power Transformers and Corresponding Protection Strategy |
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| YU Huapeng,CHEN Shuiming,YU Hongqiao,YANG Pengcheng,YIN Hua,WU Gaolin,Haidian District,Beijing ,China,.Chongqing Electric Power Research Institute,Yubei District,Chongqing ,China.Calculation of Overvoltage on Neutral Point of 110 kV Power Transformers and Corresponding Protection Strategy[J].Power System Technology,2011(3):152-158. |
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| Authors: | YU Huapeng CHEN Shuiming YU Hongqiao YANG Pengcheng YIN Hua WU Gaolin Haidian District Beijing China Chongqing Electric Power Research Institute Yubei District Chongqing China |
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| Affiliation: | YU Huapeng1,CHEN Shuiming1,YU Hongqiao1,YANG Pengcheng1,YIN Hua2,WU Gaolin2(1.State Key Lab of Control and Simulation of Power Systems and Generation Equipments(Dept.of Electrical Engineering,Tsinghua University),Haidian District,Beijing 100084,China,2.Chongqing Electric Power Research Institute,Yubei District,Chongqing 401123,China) |
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| Abstract: | To limit short-circuit current and meet the requirement of setting of relay protection equipments,the partial neutral grounding of power transformers is adopted in 110 kV power systems in China,and this kind of grounding mode will result in overvoltage on the ungrounded neutral of power transformer.The overvoltage on ungrounded neutral of power transformer of an 110kV system in Chongqing power grid is calculated by PSCAD/EMTDC software.Calculation result shows that the maximum power frequency transient over... |
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| Keywords: | neutral power transformer arrester air-gap power frequency overvoltage lightning overvoltage |
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