A Review on the Need for Investigating Space Charge Behavior in Multi-Layered Polymeric Dielectrics
Journal Title: IOSR Journals (IOSR Journal of Electrical and Electronics Engineering) - Year 2017, Vol 12, Issue 2
Abstract
The benefit of using HVDC system is partially reduced due to space charge accumulation in the insulation as the space charge has capability of enhancing the local electric field in the dielectric. Research indicates that the space charge effect is more pronounced at interfaces – precisely the dielectric-dielectric interface because of their specific properties compared to those of the bulk material. Since, multiple dielectric interfaces are encountered in cable joints, they (joints) have been identified as the weakest components of polymeric DC cable system. The local field enhancement means that the dielectric experiences electric fields above its design value at some points which can result in its breakdown eventually. A 5 year survey conducted by Cigre shows that more than 50% of the failures in extruded DC cable joints (land) were due to internal causes which makes them worthy of greater attention and calls for optimizing the compatibility of properties like permittivity and conductivity of the cable and its joint insulation by careful investigation of space charge behaviour at multi-layered dielectric interfaces. This paper aims at emphasizing the importance of improving the dielectric performance of multi-layered dielectrics by briefly reviewing the DC cable joints and the effect space charge accumulation has at its interfaces.
Authors and Affiliations
M. H. Wani
Keywords
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- EP ID EP387103
- DOI 10.9790/1676-1202032730.
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