Abstract
Experiments were conducted to measure the space charge profiles in LDPE and XLPE dielectrics containing A.O (anti-oxidant) and surfactant. Only homocharge is detected in LDPE even when the material contains A.O. or surfactant. It is discovered that positive charge profile in the vicinity of positive electrode is greatly influenced by the density of LDPE, which suggests that the diffusion of positive charge injected from the positive electrode is dependent upon the crystallinity of LDPE. Negative heterocharge is detected in the vicinity of positive electrode in XLPE dielectrics containing PDP (peroxide decomposition products). The profile of the positive charge in XLPE was discovered to be dependent upon the containing A.O., which suggest generation of charged carriers due to the synergetic effect between PDP and the A.O.. The surfactant is also discovered to be influential to the space charge profile in LDPE.
