零线电流大于相线电流的充要条件

THE SUFFICIENT AND NECESSARY CONDITIONS OF THE ZERO LINE CURRUENT BEING BIGGER THAN THE PHASE LINE CURRUENT

通过矢量运算，证明在三相四线制供电线路中，零线电流可能大于相线电流，并给出出现此种情况的充分必要条件．

This paper proves that the zero line curment may be bigger than thephase line curment with vector computation in the charging line of three phasefour-wire system,and also gives the sufficient and necessary conditions of thiscase.