Can the operating conditions of the cable system effect the data of the field PD testing?

Two approaches are available to detect PD from cables, on-line and off-line detection system. During off-line testing, the cable system is normally tested under no-load conditions while the system loading during on-line testing varies depend on the time of testing. For some insulation defects, PD intensity is load dependent. In some other, PD occurs only at certain load conditions. The types of defect that is affected by the cable loading are presented in this paper. Laboratory and field PD data of testing cables at different loading conditions are also presented