DC ELECTRICAL TREEING PHENOMENA AND SPACE-CHARGE

Influence of space charge on de tree propagation is studied using many insulating polymer materials under divergent fields. The inception vo ltage and the propagation of dc treeing are affected strongly by space charge. Space charge formation in polymers was observed directly by u sing thermally stimulated current (TSC) techniques under divergent fie ld. These results of the space charge effect on de treeing phenomena a re consistent with those obtained by the TSC method. From these result s, the origin of space charge in polymers and the suppression techniqu es for space charge formation were discussed.