ZHANG Xiaoyu,ZHENG Chao,MO Pinhao,et al.Influence of DC Magnetic Bias on Transformer Protection and Improvement of DC Magnetic Bias Protection[J].Automation of Electric Power Systems,2021,45(4):148-154.
ZHANG Xiaoyu,ZHENG Chao,MO Pinhao,et al.Influence of DC Magnetic Bias on Transformer Protection and Improvement of DC Magnetic Bias Protection[J].Automation of Electric Power Systems,2021,45(4):148-154. DOI: 10.7500/AEPS20200224001.
Influence of DC Magnetic Bias on Transformer Protection and Improvement of DC Magnetic Bias Protection
With the construction of high voltage direct current (HVDC) transmission projects
the influence of DC systems on the surrounding power equipment has been gradually concerned. When the DC system operates with monopole ground return mode or the DC control system is abnormal
arge DC current may be generated and injected into the adjacent transformers. At this time
the transformer may produce DC magnetic bias. Through the comparison of several magnetic saturation characteristics of transformer
the particularity of DC magnetic bias is pointed out. Combined with the characteristics of field waveform
the influence of DC magnetic bias and common magnetic bias suppression devices on the protection equipment is analyzed. The problems of existing DC magnetic bias protection criteria are pointed out. Based on the scenarios of DC magnetic bias and the characteristics of waveforms
several improvement suggestions on the existing magnetic bias protection are proposed. The simulation and test results show that the improved criterion can effectively improve the reliability of DC magnetic bias protection.
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