Space charge and solid insulating materials: In pursuit of space charge control by molecular design

It is essential to understand the nature of charge trapping sites to control space charge for developing better insulation materials and insulation design. Recent developments in space charge probing techniques have enabled the direct and quantitative observation of space charge distribution and dynamics. This paper briefly describes the knowledge that was available by conventional techniques and what has become possible by the recent diagnostic developments. It stresses how these advances have led to the pursuit of space charge control by molecular design.