With the investigation and analysis of a fault, this paper explains the operation of optical fiber permissive relaying protection and the course of sending permissivesignal.
通过一起保护动作的分析，对于允许式光纤保护的联动条件、允许信号的产生过程进行了细致的分析。
2
The paper gives solutions to the problems with lighting circuit of permissive aspect of block signal of existing automatic block section according to relevant specifications.