Time synchronization with IRIG-B code in substation IED

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.