Study of Transformer’s Harmonic Characteristic in DC Magnetic Bias
This Paper selects one 500 kV mono-phase type transformer as the test object. Its no-load current includes dc component and even harmonics obviously in dc magnetic bias. With the increasing of the neutral dc current, the lower the harmonic order is, the more rapidly the harmonic current increases and the larger its percent on the basic-frequency component is. The dc component keeps 70％ of the neutral dc current whether under undervoltage or overvoltage. When the neutral dc current is 4 A, dc magnetic bias comes into being in the transformer even under undervoltage. The research results can be used in the capacitor banks relay protection in 500 kV substations. The capacitor banks will be shut off once their 2nd harmonic current or the neutral dc current is over some setting value and time.
dc magnetic bias even harmonic capacitor
Guihua Mei Yancun Liu Mansheng Guo
Guangdong Electric Power Research Institute No.73,Meihua Road,Guangzhou,510600,Guangdong,China Baoding Tianwei Baobian Electric Co.,Ltd No.2222 Tianwei West Road,Baoding,071056,Hebei,China
国际会议
2008 China International Conference on Electricity Distribution (CICED 2008)(2008中国国际供电会议)
广州
英文
1-4
2008-12-10（万方平台首次上网日期，不代表论文的发表时间）