Abstract: A long-distance high-voltage cable fault degree detection method. A cable fault positioning curve is obtained by using a frequency-domain reflection method, and a cable fault positioning compensation curve is determined by means of theoretical calculation in combination with the parameters of a frequency-domain incident signal, cable structure parameters, and characteristic parameters of each layer of materials of the field test; furthermore, a cable fault diagnosis curve is determined on the basis of the cable fault positioning curve and the cable fault positioning compensation curve, the severity of the fault is determined by means of the amplitude of a peak point of the cable fault diagnosis curve, and the accuracy of long-distance high-voltage cable fault degree diagnosis is effectively improved.

Abstract: A method for detecting a storage life of a pre-crosslinked material is provided. Tableting is performed on an unaged pre-crosslinked material to obtain crosslinked polyethylene. A crosslinking degree and a mechanical property of the crosslinked polyethylene are measured to obtain reference data. The pre-crosslinked material is heated to obtain a fast-aged pre-crosslinked material. The crosslinking degree and mechanical property of crosslinked polyethylene obtained from the fast-aged pre-crosslinked material are measured to obtain measurement results, which are compared with the reference data. If comparison results all fall within corresponding ranges, the time period of heating is increased by a step to repeat the above steps until the comparison results do not all fall within the corresponding ranges. A result obtained by subtracting the step from the time period of heating is converted into a time period of storage at the room temperature.