... judge the short circuit fault indicator diagram As line 2# B phase 2,5,8 indicator and line 2# C phase 3 ... ,6,9 indicator turn red, but the 11,12 ... happen short circuit Used to judge the grounding fault indicator diagram: As line 2# C phase 3,6,9 ... indicator turn red,but the 12 indicator still show white, that judged the point ...