With the investigation and analysis of a fault, this paper explains the operation of optical fiber permissive relaying protection and the course of sending permissive signal.
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。
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.
通过对现有自动闭塞区间通过信号机容许信号点灯电路存在问题的分析，根据相关规范，提出解决办法。
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