高压直流输电直流系统保护设备现场检验方法探索

Study on on-site test method for DC protection equipment of HVDC

由于缺乏简单便捷又有效可行的检验方法与装置,投运后的高压直流输电直流系统保护设备一直未开展定期检验工作。这将对电网的安全稳定造成严重隐患。文章提出了一种高压直流输电直流系统保护设备现场检验方法,该方法的优点在于无需拆卸保护设备、无需解析光电转换协议、不会对电网造成不良影响、安全风险小、成本较低。研制了具备光电式电流互感器、零磁通电流互感器加量能力的高压直流保护现场检验装置。采用所提方法与装置在投运已超过十年的±500 k V江城直流鹅城换流站开展了现场试点检验,验证了所提方法可行。

The on-site regular test of DC protection equipment of HVDC after putting into operation has not been implemented due to lack of convenient and feasible test method and device,which will cause serious problem for security and stability of the power grid. This paper proposed a novel on-site test method of DC protection equipment of HVDC.The advantages of the method are follows as those no need to remove the equipment,explain and analyze the photoelectric conversion agreement,which eliminate the bad influence to the grid,and it has small security risk,and lower cost. The on-site test device for DC protection equipment of HVDC has been developed with adding quantity of optical current transformer and zero flux current transformers. Its validity was verified by on-site testing of DC protection equipment in Echeng convert station of Jiangling-Echeng ± 500 k V HVDC transmission project which is in operation for more than ten years.