【摘要】 介绍了河北南部电网（以下简称南网）保护复用通道的应用情况，结合实际分析了通道传输时间和返回时间与保护装置的配合关系，总结了通道时间与保护装置失配的原因，给出了通道时间的测试方法。更多还原

【Abstract】 This paper introduces the application of protection shared channel in Southern Hebei Network.Based on practice,it analyzes the coordination relationship among the channel transmission,dropout time and the protection devices,finds out why the channel time and protection devices are mismatched,and gives out the way to measure the channel time.更多还原