In recent years

buffer layer ablative failure occurs frequently in high-voltage cables with corrugated aluminum sheathed structure

which seriously affects the safe and stable operation of cables. The mechanism

detection technology and solution of buffer layer ablation have been widely concerned in the field of power cable. On the basis of describing the structure and function of buffer layer

combined with the disintegration analysis results of actual cables

the typical characteristics of ablative faults are systematically summarized from the angles of aluminum sheath

buffer layer

insulation shield layer

and main insulation layer. The mechanism of buffer layer ablation under dry and wet conditions is summarized. Under dry conditions

ablation failure is mainly caused by local current concentration caused by uneven cable force. Under humid conditions

in addition to the above mechanism

the high-resistance white powder generated by the electrochemical corrosion reaction further aggravates the current concentration phenomenon

and the Joule heat continues to accumulate

eventually causing damage to the cable structure. Based on ablative characteristics and mechanism

the applicability of various ablative defect detection techniques is discussed

including detection methods based on changes of physical signal

cable structure during ablative process and ablative products. In addition

this paper discusses the solution of buffer layer ablative failure. For the stock cable

the repair technology can be adopted to repair the fault buffer layer before the ablative damage does not hurt the insulation shield. For incremental cables

it is recommended to strictly control the composition and content of impurity ions in the buffer layer

ensure good electrical contact between the insulation shield and the aluminum sheath

or replace the existing corrugated aluminum sheath structure with a smooth aluminum sheath structure to fundamentally prevent the occurrence of ablation failures.