主变压器差动保护越级动作分析及技改措施——以柬埔寨达岱水电站为例

Analysis and Treatment for the Overstep Tripping of Differential Protection of the Main Transformer in Tatay Hydropower Station of Cambodia

分析了柬埔寨达岱水电站主变压器差动保护越级动作的原因,针对存在的问题提出了将厂高变高压侧电流接入主变差动保护、调整厂用10 k V馈线保护定值和厂高变过流保护定值的完整技改措施,对有同类安全隐患的电站有很好的参考价值。

In the Tatay Hydropower Station of Cambodia, overstep tripping of the differential protection in the main transformer is observed.Possible reasons of this fault is analyzed.Corresponding treatment measures are then proposed, such as the connection of the high-voltage current of the station high-voltage transformer to the differential protection of the main transformer, and the setting adjustment of the 10 kV feeder line protection and the over-current protection of the station high-voltage transformer.It could be a useful reference for hydropower stations with similar problems.