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Time synchronization with IRIG-B code in substation IED

ZHOU Bin1,2,HUANG Guo-fang 2,WANG Yao-xin 3,ZHANG He2(1.Southeast University,Nanjing 210096,China;2.NARI Technology Development Limited Company, Nanjing 210003,China;3.North China Power Dispatching Bureau,Beijing 100053,China)  
The time code standards for synchronization issued by IRIG are introduced,in which the IRIG-B code is the most popular.The synchronization principle of IRIG-B code is analyzed.When applying IRIG-B code in substation IED,neither communication messages of fieldbus nor multiple pulse signals of GPS are needed.An interface circuit and corresponding software program flow of IRIG-B code synchronization are presented.Site practice shows it effective.
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