Fabrication design and electrical evaluation of bulk-graded filled polymer post insulators

An investigation has been made of the feasibility of grading an electric field by means of electrically active particulate fillers in polymeric matrix materials. Concepts investigated included linear resistive, nonlinear resistive and capacitive grading. This paper describes the design, fabrication and electrical evaluation of bulk-graded filled polymer insulators. The design emphasized in the study was a capacitively graded 23 kV post insulator.