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提出了一种既能方便解决单相电力系统中的稀疏矩阵的存取，又能方便解决三相电力系统计算中的稀疏矩阵存取问题的二维稀疏结构技术。该技术还方便地解决了单、三相计算中迭代方程组系数方程的存取及非零元素注入问题。使得处理稀疏矩阵象处理二维数组一样地简单。把二维稀疏结构作为一种基本数据结构来描述，这对形成电力系统计算类库具有实际意义。“,”To solve the problems on sensitivity of phase to phase backup protection on transformer’s power supply side, especially the problems on the backup protection on the conditions of a current limit reactor applied on the LV side, a sum current protection formed by CT on HV and MV sides on transformer is proposed. Its principle, construction and setting way are different from the traditional overcurrent protections. In the author’s view, the sum current protection would improve the sensitivity considerably and should make it be a standard arrangement. Its CT should be delta wired realized by microprocessor based device. Its setting should be done based on single transformer operation.