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变电站时间同步系统常规是由主站GPS通过网络广播对时,对网络通道具有较强的依赖性,对时响应慢、间隔时间长,并且存在地域性毫秒级误差。这对继电保护及二次设备,尤其是跨地域地区联网线路的保护装置的影响较大,可能会导致两侧保护的不同步。河南省郑州市区及周边地市级现新建综自变电站及智能数字化变电站对时系统将原有的GPS单套主站网络广播对时系统变更为GPS和“北斗”双对时点对点系统。一方面减弱了对GPS系统的依赖性,为“北斗”系统的上线运行奠定了物质基础;另一方面,降低了对网络通道的依赖性,使各个变电站各自具有对时功能,并且快速点对点传输缩短了对时的时间响应。提高时间同步的可靠性,从而消除地域性毫秒级的误差,保证了跨地区互联线路保护及测控装置的同步性。
Substation time synchronization system is usually broadcast by the main GPS network through the network, has a strong dependence on the network channel, the response time is slow, long time interval, and there are regional millisecond error. This has a major impact on the protection of relays and secondary devices, especially those across the geographically dispersed network lines, which may cause the protection of both sides to be out of sync. Zhengzhou City, Henan Province and the surrounding municipalities and autonomous regions are now new integrated substation and intelligent digital substation on time system will be the original GPS single set of master network broadcast time system changed to GPS and “Beidou ” double-time point-to-point system . On the one hand, the dependence on the GPS system is weakened, laying a material foundation for the operation of the Beidou system. On the other hand, the dependency on the network channel is reduced, so that each substation has its own time-sharing function and is fast Peer-to-peer transmission shortens the time response to time. Improve the reliability of time synchronization, thus eliminating the regional millisecond error, to ensure inter-regional interconnection line protection and synchronization of measurement and control devices.