The Methodology of Detection for Power Cable Insulation Defects Based on AC Voltage Withstand Test

This chapter presents a new method of insulation defects detection for power cable based on AC withstand voltage test. This method considers transient voltage and current generated during boost process as signal sources to construct discriminant function related to the transient harmonic voltage and current. Then extreme value distribution of the discriminant function and frequency characteristic of total insulation resistance of cable insulation is calculated. Finally, the diagnosis of cable insulation defects and the assessment whether AC voltage test itself causes insulation damage or not are achieved. The proposed method makes full use of the valuable information provided by AC voltage withstand test. It improves the efficiency of AC voltage withstand test of power cable and is beneficial for the development of power cable detection technology.