Abstract：When transformers are energized under no-load or lightly loaded condition, the inrush current may occur on the primary circuit of the transformers. The magnetizing inrush current is inevitable when the transformer core enters into saturation state or even deep saturation state due to the many factors such as inception angles, residual flux and so on. The magnetizing inrush current has adverse effect both on the transformer itself and the power quality in the power system. A new technique to remove the inrush currents is proposed when the transformers are switched on. Incorporating the “inrush current suppresser(ICS)”, it makes use of the tertiary winding of the three-winding transformer to allow the voltage on the tertiary winding climb gradually, and ensures that the voltages on both sides have the same phase, but different magnitudes. In this case, the inrush current can be eliminated successfully. The simulation results show the correctness and effectiveness of the proposed method.
何越, 林湘宁, 黄景光. 一种直接消除变压器合闸励磁涌流的方法[J]. 电工技术学报, 2011, 26(11): 141-149.
He Yue, Lin Xiangning, Huang Jingguang. A Method to Eliminate the Magnetizing Inrush Current of Energized Transformers. Transactions of China Electrotechnical Society, 2011, 26(11): 141-149.
[1] (英) 马丁J• 希思科特. 变压器实用技术大全[M]. 12版. 王晓莺等译. 北京：机械工业出版社, 2004. [2] Khalifah Al A K, Saadany El E F. Investigation of magnetizing inrush current in a single-phase transformer[C]. Proceedings of the Large Engineering Systems Conference on Power Engineering, 2006: 165-171. [3] Basu K P, Morris Stella. Reduction of magnetizing inrush current in traction transformer[C]. Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies, 2008: 2302-2305. [4] Bronzeado H S, Pinto S O, Jonsson P, et al. Transformer controlled switching to eliminate inrush current—partⅡ: field tests on a 100MVA three-phase transformer[C]. Proceedings of the IEEE PES Transmission & Distribution Conference and Exposition: Latin America, 2006: 1-7. [5] 朱坷, 徐文远, 田立军, 等. 利用中性点电阻削弱变压器励磁涌流[J]. 电力系统自动化, 2006, 30(11): 61-66. Zhu Ke, Xu Wenyuan, Tian Lijun, et al. New method for mitigating magnetic inrush current of transformer by neutral grounding resistor[J]. Automation of Electric Power System, 2006, 30(11): 61-66. [6] 李琥, 周海洋. 断路器合闸电阻对变压器励磁涌流的影响[J]. 高压电器, 2003, 39(1): 16-18, 21. Li Hu, Zhou Haiyang. Effect of closing resistor inside circuit breaker on inrush current of transformer[J]. High Voltage Apparatus, 2003, 39(1): 16-18, 21. [7] 林湘宁, 刘沛, 刘世明, 等. 变压器有载合闸的超饱和现象及对变压器差动保护的影响[J]. 中国电机工程学报, 2002, 22(3): 6-11. Lin Xiangning, Liu Pei, Liu Shiming, et al. Ultra- saturation state during transformer switch-in with load and its influence to transformer differential protection[J]. Proceedings of the CSEE, 2002, 22(3): 6-11. [8] 王增平, 徐岩, 王雪, 等. 基于变压器模型的新型变压器保护原理的研究[J]. 中国电机工程学报, 2003, 23(12): 54-58. Wang Zengping, Xu Yan, Wang Xue, et al. Study on the novel transformer protection principle based on the transformer model[J]. Proceedings of the CSEE, 2003, 23(12): 54-58. [9] 郝治国, 张保会, 褚云龙, 等. 基于等值回路平衡方程的变压器保护原理的研究[J]. 中国电机工程学报 2006, 26(5): 67-72. [10] 熊小伏, 邓祥力, 游波. 基于参数辨识的变压器微机保护[J]. 电力系统自动化, 1999, 23(11): 18-21. Xiong Xiaofu, Deng Xiangli, You Bo. Transformer protection using parameter identification method[J]. Automation of Electric Power Systems, 1999, 23(11): 18-21. [11] Youssef O A S. Applications of fuzzy-logic-wavelet- based techniques for transformers inrush currents identification and power systems faults classifica- tion[C]. IEEE PES Power Systems Conference and Exposition, 2004, 1: 553-559. [12] 宗洪良, 金华烽, 朱振飞, 等. 基于励磁阻抗变化的变压器励磁涌流判别方法[J]. 中国电机工程学报, 2001, 21(7): 91-94. Zong Hongliang, Jin Huafeng, Zhu Zhenfei, et al. Transformer inrush detected by the variation of magnetizing impedance[J]. Proceedings of the CSEE, 2001, 21(7)：91-94. [13] 吕志娟, 刘万顺, 肖仕武, 等. 一种快速识别变压器励磁涌流和内部故障的新方法[J]. 中国电机工程学报, 2006, 26(2): 47-51. Lü Zhijuan, Liu Wanshun, Xiao Shiwu, et al. A new scheme to fast discriminate inrush current from internal fault of power transformer[J]. Proceedings of the CSEE, 2006, 26(2): 47-51. [14] 张保会, 尹项根. 电力系统继电保护[M]. 北京：中国电力出版社, 2005. [15] 李钷, 乌云高娃, 刘涤尘, 等. Preisach模型剩磁计算与抑制励磁涌流合闸角控制规律[J]. 电力系统自动化, 2006, 30(19)：19: 37-40. Li Po, Wuyun Gaowa, Liu Dichen, et al. Calculation of residual flux based on preisach model and entering phase control of transformer to eliminate inrush current[J]. Automation of Electric Power System 2006, 30(19): 37-40.
2011, Vol. 26 
