Method and device for detecting ablation fault of XLPE cable buffer layer

The invention discloses an XLPE cable buffer layer ablation fault detection method and device, and the method comprises the steps: filling a gap of a buffer layer at one end of an XLPE cable with gas according to a specified flow velocity; meanwhile, a gas outlet at the other end of the XLPE cable is used for detecting a characteristic quantity which is used for representing that after the XLPE cable absorbs moisture and is ablated, white powder is generated between the inner side of the trough of the aluminum sheath and the buffer layer, so that the gas flow area in the gap of the buffer layer is changed, and whether the XLPE cable has a buffer layer ablation fault or not is judged according to the characteristic quantity. The invention aims to provide the XLPE cable buffer layer ablation fault detection scheme which is not influenced by field electromagnetic interference, simple and convenient in field operation, convenient in detection, low in equipment cost, short in detection time, high in safety, simple