Study on Factors Affecting Residual Magnetism of Phase Selection of Extreme High Voltage Transformer and Its Calculation Method
Journal of Electrical and Electronic Engineering
Volume 7, Issue 2, April 2019, Pages: 57-63
Received: Apr. 20, 2019;
Published: Jun. 15, 2019
Views 46 Downloads 16
Teng Wentao, Power System Department, China Electric Power Research Institute, Beijing, China
Xiang Zutao, Power System Department, China Electric Power Research Institute, Beijing, China
Zheng Bin, Power System Department, China Electric Power Research Institute, Beijing, China
Song Xiuyou, School of Electrical Engineering, Beijing Jiaotong University, Beijing, China
Zhang Yuanyuan, Power System Department, China Electric Power Research Institute, Beijing, China
Li Kuan, Shandong Electric Power Research Institute, Jinan, China
Follow on us
As one of the core components in the extreme high voltage power grid, the extreme high voltage transformer has a large rated capacity, and the level of magnetizing inrush current generated by the air-to-air transformer is high. At the same time, a large amount of harmonics are injected into the power grid. In severe cases, a long duration and a slow decay can be generated. The voltage has an adverse effect on the near-area grid and equipment (especially power electronics). In order to further improve the safety and reliability of systems and equipment, effective measures need to be taken to suppress them. At present, the measures that can be used to limit the main transformer closing current include the circuit breaker installation closing resistor and the phase selection closing technology. However, since the closing resistance does not exceed 10 ms, it limits the main transformer closing excitation current, harmonics and over The effect of voltage is relatively limited, and the conventional phase-selection closing technology cannot consider the influence of transformer remanence, and its limiting effect is also not ideal. Foreign research and the use of phase-selection closing technology that takes residual magnetism in some ultra-high-pressure projects to solve the problem of air-to-air inrush current has gained some experience. In theory, this measure is expected to solve the extreme high voltage large-capacity transformer very ideally. Inrush current, harmonics, waveform distortion and overvoltage caused by closing. In this paper, the influencing factors of remanence of extreme high voltage transformers in phase-selective switching technology are studied. According to the research results, the specific scheme of voltage integral to measure residual magnetism is established.
Extreme High Voltage Transformer, Residual Magnetism, Option Switching, Voltage Integral Calculation Method
To cite this article
Study on Factors Affecting Residual Magnetism of Phase Selection of Extreme High Voltage Transformer and Its Calculation Method, Journal of Electrical and Electronic Engineering.
Vol. 7, No. 2,
2019, pp. 57-63.
Niu Shuaijie, Zhao Lihua, Chen Ling, et al. Research on Residual Magnetic Resonance Detection Method Based on Time-Current Curve [J]. Electric Measuring & Instrumentation, 2017 (07): 71-75+87.
Zhou Jianping, Luo Jian, ZHOU Jian-ping, et al. An Estimation Method for Residual Magnetism of Transformer Core [J]. Thermal Power Generation, 2010, 39 (3): 61-64.
Xing Yunmin, Luo Jian, Zhou Jianping, et al. Residual Magnet Estimation of Transformer Core [J]. Power System Technology, 2011 (2): 169-172.
He Yuan, Li Xin, Luo Jian. Research on Identification of Transformer Magnetizing Inductance Using Hysteresis Loop [J]. Power System Protection and Control, 2013 (14).
Zhang Xiaojie, Yang Bo, Chen Lei. Research on Calculation Method of Residual Magnetism of Transformer Based on Hysteresis Loop [J]. 1997, 52 (10): 11-13.
Yang Yuyan, Wang Bao. Transformer Model Considering Hysteresis Based on PSCAD V4.6 [J]. Guangdong Electric Power, 2017, 30 (6): 67-72.
Qi Guozheng. Research on Transformer Magnetizing Inrush Current Suppression Technology [D]. 2017.
Ge Wenqi, Wang Youhua, Chen Xueguang, et al. Measurement and weakening method of core remanence in power transformers [J]. Transactions of China Electrotechnical Society, 2015, 30 (16): 10-16.
Huang Jin, Liang Zhaoting. Selection and correlation technology based on residual magnetic measurement [J]. Electrical Apparatus and Energy Efficiency Management Technology, 2011 (9): 10-13.
Wang Yang. Research on Remanence Prediction of Transformer Core [D]. Shandong University, 2017.
Huang Jin. Research on the selection and correlation technology of no-load transformers [D]. 2010.
Ni Haimiao. Research on the method of suppressing the inrush current of the no-load transformer based on phase selection control [D]. 2016.