5Wu Zhenghua. Study on selection of transformer capacity and conduction cross-section related to 20kV network in high voltage distribution network[C].//2010 China International Conference on Electricity Distribution: 2010, 1 -6.
6Jardini J A, V.tahan C M, et al. Selection of distribution transformer based on economic criteria[C]//14^th International Conference and exhibition on Electricity Distribution: 1997, 14/1-14/5.