变压器三相涌流波形特征分析及判别方法研究 |
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引用本文: | 卓元志,李康,赵斌,韩斌,赵雪沉璎.变压器三相涌流波形特征分析及判别方法研究[J].电网与水力发电进展,2012,28(6):44-48. |
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作者姓名: | 卓元志 李康 赵斌 韩斌 赵雪沉璎 |
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作者单位: | 1. 西安铁路局安康供电段,陕西 安康,725000 2. 西安供电局,陕西 西安,710016 3. 中国水利电力物资西安公司,陕西 西安,710004 |
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基金项目: | 国家自然科学基金项目(51077109) |
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摘 要: | 在揭示变压器励磁涌流两大波形特征的基础上,充分利用波形特征,提出一种利用波形特征区分变压器励磁涌流和内部故障电流的方法,该方法基于涌流波形呈现出尖顶波的凹弧特征,而故障电流基本保持正弦波形特征,在半波周期内找到采样值的极值点及频率,构造出与之对应的虚拟正弦波形,通过判断合闸电流与构造波形在半波周期内的相似程度来区分励磁涌流和故障电流。仿真结果表明,该方法能够有效、快速切除变压器内部故障,并且不受电流非周期分量的影响。
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关 键 词: | 变压器 励磁涌流 故障电流 凹弧特征 虚拟正弦波形 |
Analysis and Assessment Methods of Waveform Characteristics of Three-Phase Transformer Inrush Current |
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Authors: | ZHUO Yuan-zhi LI Kang ZHAO Bin HAN Bin and ZHAO Xue-chen-ying |
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Affiliation: | ZHUO Yuan-zhi1,LI Kang1,ZHAO Bin2,HAN Bin1,ZHAO Xue-chen-ying3 (1.Ankang Power Supply Section,Xi’an Railway Bureau,Ankang 725200,Shaanxi,China;2.Xi’an Electric Power Supply Bureau,Xi’an 710016,Shaanxi,China;3.Xi’an Branch of China National Water Resouces & Elec.Power Materials & Equipment CO.,Xi’an 710004,Shaanxi,China) |
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Abstract: | With two big waveform characteristics of the transformer excitation inrush current revealed,this paper makes full use of the waveform characteristics,and then proposes a method of distinguishing the transformer excitation inrush current and internal fault current.This method is based on the assumption that the inrush current waveform presents the spire concave arc characteristics and fault current presents the sine waveform characteristics,and in half a cycle samples values can find the extreme value point,frequency,forming the corresponding virtual sine wave.Judging the similarity between the closing current and the tectonic waveform in half-wave cycle can distinguish between the excitation inrush current and fault current.The simulation results show that this method can effectively and quickly remove the internal faults of the transformer,and is not influenced by the aperiodic current components. |
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Keywords: | transformer magnetizing inrush current fault current concave arc features virtual sine waveform |
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