Study on DC Bias Magnetic Properties of Transformer with Different Structures

Abstract:

When the HVDC works in mono-polar operation or bipolar unbalanced operation, DC flows through the neutral point and causes DC bias magnetic of transformer around HVDC grounding electrode, which influences the operation security of transformers. Beside highly saturated core, it also causes the distortion of exciting current, increasing harmonics and leakage magnetic flux, and thus the losses, which in turn results in the structures of transformer overheating and insulation aging. Based on the principle of transformer DC bias magnetic and UMEC of transformer in PSCAD/EMTDC, electromagnetic transient simulation platform of transformer DC bias magnetic is built. Considering the effect of DC bias magnetic on different structure of transformer, three kinds of typical transformer that has been widely applied are selected including three-phase three-limb transformer, three-phase five-limb transformer, three-phase bank transformer. After comparing the differences between these three kinds of transformer, related parameters are set such as the core structure and mode of winding connection and so on.

• Periodical: Applied Mechanics and Materials (Volumes 672-674)
• Pages: 793-798
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.672-674.793
• Online since: October 2014
• Authors: Yue Hua Huang, Qing Xie*, Ming Gao, Zhe Heng Zhou, Xu Liu
• Keywords: Dc Magnetic Bias, PSCAD/EMTDC, Simulation, Transformer

References

[1] Hongliang Wang: Research on Grounding Current of HVDC Mono-polar Operation[D]. Chengdu: Southwest Jiaotong University. 2007(in Chinese).

[2] Wanjun Zhao: HVDC Engineering Technology[M]. Beijing: China Electric Power Press, 2004: 1-30(in Chinese).

[3] Xuefeng Wang, XiaofeiYu, Junyu Zhou: Study on the DC Current of Neutral Point of Transformer in AC and DC Mixed Power System[J]. Power System Technology, 2008, 2(12): 96-98(in Chinese).

[4] Mansheng Guo, zhiguang Cheng, junjie Zhang: Single-Phase Three-Column Power Transformer Dimensional Magnetic Field Analysis under DC Bias Condition[J]. Transformer, 2007, 44(4): 31-35(in Chinese).

[5] Ping Jian, Xing Pan: the Reasons Analysis of Abnormal Noise and Vibration for 500KV Transformer[J]. Zhejiang Electric Power. 2006. 34(3): 6-10(in Chinese).

[6] Fucheng Huang, Jiangjun Ruan, Yu Zhang, et al. DC Magnetic Bias Induced Current Effects on Transformer and Restricting Methods[J]. High Voltage Engineering, 2006, 32(9): 117-120(in Chinese).

[7] Daochun Huang, Yuanhang Wei, Lianhong Zhong, et al. Discussion on Several Problems of Developing UHVDC Transmission in China[J]. Power System Technology, 2007, 31(8): 6-12(in Chinese).

[8] Hua Xiao: Research on Transformer DC magnetic Bias Problems caused by UHVDC[D]. Chengdu: Southwest Jiaotong University. 2010(in Chinese).

[9] Xiaoping Li, Xishan Wen: DC Bias Computation Study on Three-Phase Five Limbs Transformer[J]. Proceedings of the CSEE, 2010, 30(1): 127-131(in Chinese).

[10] Hongzhi Li, Xiang Cui, Tiebing Lu, et al. Electric Circuit and Magnetic Circuit Combined Model of DC Biased Power Transformer[J]. Proceedings of the CSEE, 2009, 29(27): 119-125(in Chinese).

[11] Lin Cao, Jinliang He, Bo Zhang: Dynamic Hysteresis Loss Model of Power Transformer under DC Biasing and Its Verification[J]. Proceedings of the CSEE, 2008, 28(24): 141-146(in Chinese).

[12] Zhigang Zhao, Fugui Liu, Junjie Zhang, et al. Measurement and Analysis of Magnetizing Current in DC-Biased Transformers[J]. Transactions of China Electrotechnical Society, 2010, 25(4): 71-76(in Chinese).

DOI: 10.1109/tasc.2010.2041211

[13] Ke Dang, Xiaoyu Zhang, Feng Zhang, et al. Simulative Study on Power Transformer with DC Magnetic Biasing[J]. Power System Technology, 2009, 33(20): 189-192(in Chinese).

[14] Xiaoping Li, Xishan Wen, Lei Lan, et al. Test and Simulation for Single-Phase Transformer under DC Bias[J]. Proceedings of the CSEE. 2007, 27(9): 33-40(in Chinese).

DOI: 10.1109/emczur.2006.214911

[15] Xiaoping Li, Xishan Wen, Cixuan Cheng: Simulating Analysis of Exciting Current of Single Phase Transformer on DC Bias[J]. High Voltage Engineering, 2005, 31(9): 8-10(in Chinese).