Case study of "dead ground" fault in 20kV cross-li

    Line Name: XXX Transformer 226nm # 6 Line Outgoing Line

    Testing location: XXXX switching station

    Test date: January 13, 2021

    Cable type: YJV22-12/20kV-3 * 400

    Cable length: 2300m

    The cable duct laying of this line experienced a grounding fault during operation. After on-site inspection and investigation, it was found that a construction site had carried out drilling construction on the line, and it was suspected that the cable was damaged. However, due to the cable burial depth of more than 2 meters, the fault point cannot be directly determined.