Suzhou Electric Appliance Research Institute
期刊号: CN32-1800/TM| ISSN1007-3175

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变压器直流偏磁产生机理及偏磁电流实测研究

来源:电工电气发布时间:2016-04-06 15:06 浏览次数:1

变压器直流偏磁产生机理及偏磁电流实测研究 

刘康,温定筠,胡春江,张秀斌,何巍 
国网甘肃省电力公司电力科学研究院,甘肃 兰州 730050 
 

摘 要:阐述了变压器直流偏磁产生的原因,介绍了由地磁扰动引起的地磁感应电流和直流输电产生的地中直流,研究了直流偏磁对变压器的影响,并通过对酒泉地区变压器偏磁电流、振动以及噪声进行测试和分析,证实了变压器直流偏磁的严重程度受偏磁电流大小的影响。依据实测结果,比较了两种中性点直流电流测量方法,认为电阻法适合测量中性点单点接地的变压器,而传感器法适合测量中性点有多个接地点的变压器。
关键词:变压器;直流偏磁;中性点;直流电流测量
中图分类号:TM401+.1 文献标识码:A 文章编号:1007-3175(2014)12-0026-05


Study on Mechanism of Transformer DC Magnetic Bias and Its Current Measurement 

LIU Kang, WEN Ding-jun, HU Chun-jiang, ZHANG Xiu-bin, HE Wei 
Electric Power Research Institute of Gansu Electric Power Corporation, Lanzhou 730050, China 
 

Abstract:Description was made on the causes of transformer DC magnetic bias generation and introduction was made to grounding magnetic induction current caused by grounding magnetic disturbance and grounding current caused by DC transmission. This paper studied impact of DC magnetic bias on transformer and carried out measurements and analysis for Jiuquan area transformer magnetic bias current, vibration and noises, which proved that the severity degree of transformer DC magnetic bias was depended on the magnetic bias current value. According to actual measurement result, this paper compared two kinds of neutral point grounding DC current measurements methods. It is considered that resistance method is better for transformer with neutral point single grounding and sensor method is better for neutral point with multiple grounding transformers.
          Key words: transformer; DC magnetic bias; neutral point; DC current measurement


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