220kV海龙变GPS对时系统改造理论分析与实现

Theoretical analysis and realization of the GPS time synchronization system improvement in 220kV HaUong substation

结合220kV海龙变新安装的GPS对时装置，对全站综合自动化设备GPS对时系统改造进行了理论分析并最终得以实现。根据现状分析找出了全站GPS时钟失准的根本原因。

According to the new GPS time synchronization device in 220kV Hailong substation, the improvement of GPS time synchroni- zation system were analyzed theoretically for integrated automatic equipment in the total station, and ultimately was able to achieve. Based on the analysis of the present situation,the basic reason of inaccurate GPS clock for the total station found out.