| 一起220kV变压器短路事故分析 |
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| 引用本文： | 李爽,赵义松,张巍,刘志勇.一起220kV变压器短路事故分析[J].东北电力技术,2012,33(9):32-34. |
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| 作者姓名： | 李爽 赵义松 张巍 刘志勇 |
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| 作者单位： | 1. 辽宁省电力有限公司电力科学研究院,辽宁 沈阳,110006
2. 抚顺市电力设计院,辽宁 抚顺,113008 |
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| 摘 要： | 针对辽宁电网一起220 kV变压器短路事故,根据系统短路故障情况,利用序网络法建立系统三序网络模型,从而求出变压器二次绕组的短路零序电流。计算表明,变压器二次绕组零序电流过大是造成此次事故的主要原因,零序阻抗小于正序阻抗将使单相短路电流大于三相短路电流,给设备带来更大的损坏,并根据此次短路事故提出了反事故措施。
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| 关 键 词： | 单相短路 变压器 序网络 零序电流 二次绕组 |
Calculation and Analysis on a Short Circuit Fault in 220 kV Transformer |
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| LI Shuang
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ZHAO Yi-song
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ZHANG Wei
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LIU Zhi-yong.Calculation and Analysis on a Short Circuit Fault in 220 kV Transformer[J].Northeast Electric Power Technology,2012,33(9):32-34. |
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| Authors: | LI Shuang ZHAO Yi-song ZHANG Wei LIU Zhi-yong |
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| Affiliation: | 1.Electric Power Research Institute of Liaoning Electric Power Co.,Ltd.,Shenyang,Liaoning 110006,China; 2.Fushun Electric Power Design Institute,Fushun,Liaoning 113008,China) |
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| Abstract: | For a short circuit fault of 220 kV transformer in Liaoning power system,three sequence networks are modeled by means of sequence network method according to the short circuit fault.Then,the zero-sequence current in the secondary windings of the transformer is gained.The calculation results indicated that the main cause to this fault is due to zero-sequence current in the secondary of the transformer which is much larger than the rated value.The transformer is inclined to be damaged if zero-sequence impedance smaller than positive-sequence impedance.Finally,some measures to prevent the fault are proposed based on this short circuit fault. |
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| Keywords: | Single phase short circuit Transformer Sequence network Zero-sequence current Secondary winding |
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