6Dawai Gao. A novel thyristor assisted diverter switch for on load transformer tap changer[C]. Transmission and Distribution Conference and Exhibition 2002: Asia Pacific. [s.l.], 2002:297-300.
7Li Xiaoming, Liao Qingfen, Yin Xianggen, et al. A new on-load tap changing system with power electronic elements for power transformers[C]. PowerCon 2002. 2002 International Conference on Power System Technology Proceedings. [s.l.],2002,1:556-559.
8Heinemann L, Mauthe G. The universal power electronics based distribution transformer, an unified approach[C]. Power Electronics Specialists Conference, PESC, 2001 IEEE 32nd Annual. [s.l.], 2001, 2: 504-509.