During the operation of 35 kV single-core cable line

the metal shielding layer will produce induced electromotive force. If both ends of the cable are grounded

it will create a grounding circular current. Excessive grounding circulation will destroy the insulation performance of cable and easily cause cable single-phase grounding short circuit. Based on the case of grounding short circuit accident of 35 kV single-core cable in a domestic wind power plant

the main cause of the accident is that the cable metal shielding layer did not meet the national quality standard by means of field survey and laboratory test. The other cause of the accident is that the construction technology is not standard

leaving hidden quality trouble. For the exposed problems

it is proposed to replace the unqualified cables in the same batch

immediately rectify the non-standard construction technology

and strengthen the daily operation and maintenance management of the cable line.