Observation of Space Charge Distribution in Layered Different Insulating Material used for DC Transmission Cable under DC High Electric Field

Abstract

We investigated the space charge accumulation characteristics under a DC high electric field including a polarity reversal in double-layered samples in which LDPE (or modified LDPE) and EPR were laminated simulating a joint of DC power transmission cable. It was found that a large amount of space charge accumulated at the interface between LDPE and EPR while it was not observed at the interface between the modified LDPE and EPR.