Electric field and space charge measurements in thick powerr cable isulation - [Feature Article]

摘要

Quantitative evaluation of the state of power cable insulation is still a challenge, involving much academic and industrial work. Build-up of space charge within the insulation under both ac and dc conditions is one of the aging indicators used by the electrical engineering community. However, well-proven and sensitive techniques are required to obtain accurate and reproducible results. This paper deals with measurement of space charge profiles in power cable insulation under high-voltage ac (HVAC) and dc (HVDC) electrical stress (Figure 1).