1. Hongquan J, Jian Z, Yansong Y, et al. Comment on performance of differential protection taking into account electronic current transducers. Power Syst Technol, Guangzhou. 2006;30(23):61–6, (in Chinese).
2. Yubo Y, Yuping L, Yang X, et al. The influence and countermeasure to transformer differential protection of CT partial transient saturation caused by external fault removal. Proc CSEE, Guangzhou. 2005;25(10):12–7, (in Chinese).
3. Luciano BA, De Albuquerque JMC, De Castro WB, et al. Nanocrystalline material in toroidal cores for CT analytical study and computational simulations. Mater Res, Washington. 2005;8(4):395–400.
4. Wei X, Hang L, Li L, et al. Distinguish CT’s extreme saturation by waveform discrimination of branch current. Electr Power Autom Equip, Nanjing. 2005;25(9):39–42, (in Chinese).
5. Yong L, Youyuan N. 3-D magnetic field analysis and mutual inductance computation of current transducer. Electr Power Autom Equip, Nanjing. 2011;31(1):27–30, (in Chinese).