Discussion on the construction of time-synchronization network in electric power system

Based on the detailed investigation on the construction of time-synchronization system in several large power plants,transformer substations, dispatching and control centers in China Southern Power Grid,this paper summarizes the demand of power automation system for time accuracy as well as the key technologies,timing mode,timing processes and the construction degree etc.It analyzes the existing problems during the construction of time-synchronization system and explains the system configuration,performance and unified timing mode.It is brought forward the idea that a sub-time-synchronization network in each power plant or substation should be built before the provincial time-synchronization network is constructed.Some construction plans of the time-synchronization system in power substations are also put forward by the paper.