由于定子绕组为整数槽分布，出现只有一匝的匝间短路，此故障的分析计算表明，各种主保护方案均将拒动，文中特别注意发电机不完全纵差保护中性点侧电流互感器接入方式问题，结论是多分支大型水轮发电机的不完全纵差保护，不能每相中性点侧仅接入一个分支的电流互感器 As the stator winding is distributed in integer slots, there is only one turn of turn-to-turn short circuit. The analysis and calculation of this fault shows that all kinds of main protection schemes will not move. In this paper, special attention is paid to the generator neutral- Access problems, the conclusion is that the multi-branch large hydrogenerator imperfect longitudinal protection, can not access each phase of the neutral point only a branch of the current transformer