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《Electric Power Automation Equipment》 2007-11
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Implementation of GPS synchronization system in 220 kV substation

LEI Ting,LI Bin,HUANG Tai-gui(Dispatching & Communication Center,Hefei 230022,China)  
The key techniques in the implementation of 220 kV substation GPS(Global Positioning System) synchronization system are summarized,mainly in design,monitoring,verification and error analysis.A typical architecture of time synchronization system for substation devices is presented,as well as three configurations of GPS clocks:single,double and multiple.The synchronization error is calculated based on the on-line analysis of PPH(Pulse Per Hour) SOE(Sequence Of Events) for synchronization monitoring.Time accuracy verification is carried out with GPS verification instrument.Its working principle and verification method are presented and its main influencing factors are introduced.The causes of synchronization error are summarized and the countermeasures are proposed.A quantitative analytical method of synchronization error is presented for software-hardware coordinating synchronization.
【CateGory Index】: TM73
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