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Time synchronization based on GPS clock

ZOU Hong-yan,ZHENG Jian-yong(Southeast University,Nanjing 210096,China)  
The GPS(Global Positioning System) is widely used in substation automation system. The structure and function of GPS synchronous clock device are introduced. Based on the synch accuracy analysis and comparison between serial communication mode and pulse signal mode,an integrative scheme is presented. SOE(Sequence Of Events) is realized in substation automation system by applying a millisecond timer and GPS synchronous clock. Both software sync and hardware sync are introduced.
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