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

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變壓器直流偏磁產(chǎn)生機(jī)理及偏磁電流實測研究

來源:電工電氣發(fā)布時間:2016-04-06 15:06 瀏覽次數(shù):19

變壓器直流偏磁產(chǎn)生機(jī)理及偏磁電流實測研究 

劉康,溫定筠,胡春江,張秀斌,何巍 
國網(wǎng)甘肅省電力公司電力科學(xué)研究院,甘肅 蘭州 730050 
 

摘 要:闡述了變壓器直流偏磁產(chǎn)生的原因,介紹了由地磁擾動引起的地磁感應(yīng)電流和直流輸電產(chǎn)生的地中直流,研究了直流偏磁對變壓器的影響,并通過對酒泉地區(qū)變壓器偏磁電流、振動以及噪聲進(jìn)行測試和分析,證實了變壓器直流偏磁的嚴(yán)重程度受偏磁電流大小的影響。依據(jù)實測結(jié)果,比較了兩種中性點(diǎn)直流電流測量方法,認(rèn)為電阻法適合測量中性點(diǎn)單點(diǎn)接地的變壓器,而傳感器法適合測量中性點(diǎn)有多個接地點(diǎn)的變壓器。
關(guān)鍵詞:變壓器;直流偏磁;中性點(diǎn);直流電流測量
中圖分類號:TM401+.1 文獻(xiàn)標(biāo)識碼:A 文章編號: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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