The conditions that fast reclosing must satisfy is analyzed.When the kinds of fault can be identified correctly,the reclosing time can be set respectively for instantaneous and permanent fault.

• 分析了实际系统中采用快速重合闸时应满足的系统条件，指出在能够判别瞬时与永久故障时合闸时间的整定应按最大送电方式分别整定计算。