1. Ge, B., Wang, X., Su, P.: Excitation Inrush current criterion and its development direction for power transformers. Power Syst. Autom. 27(22), 1–5 (2003). (in Chinese)
2. Zhao, X., Chai, J., Su, P.: Identifying transformer excitation inrush current using magnetic flux trajectory features. Relay 32(2), 1–5 (2004). (in Chinese)
3. Kasztenny, B., Kezunovic, M.: Digital relays improve protection of large transformers. IEEE Comput. Appl. Power 80, 673–683 (1992). (in Chinese)
4. Li, Z., He, A., Wang, H.: Analysis of differential protection misoperation of 330 kV transformer caused by excitation inrush current. Distrib. Energy 2, 8–14 (2020). (in Chinese)
5. Jiao, Z., Song, G.: Transformer protection principle based on comprehensive impedance of fault components. Proc. CSEE 34, 94–100 (2008). (in Chinese)