When the commissioning of No. l Generating Unit at Dachaoshan hydropower station, both 500 kV facilities and the No. 2 Dakun transmission line were energized with no-load operation for about 2 days.

• 当大朝山电站1~%23发电机投入试运行时,大昆2~%23线及500 kv系统已空载稳定运行了近两天,调试CAT时,突然因接地故障保护装置动作,断路器分闸。