Through the analysis of three phase prepayment control box use condition in Xiangfan district,the problems which are possible appearing during its operating process were pointed out.

• 对目前存在的配电网线损计算方法进行了详细分析,比较了各种方法的应用范围和局限性,并考虑了三相潮流不对称情况下的线损计算。