Abstract
Abstract High-voltage direct current (HVDC) transmission is known as green-energy transfer technology and has recently become an attractive alternative of high-voltage alternating current (HVAC) due to its high-power transmission capability and lower power loss. Use of composite insulators on direct current (DC) transmission lines experienced rapid growth in recent years due to their high hydrophobicity and better performance in contaminated environment than conventional ceramic insulators. During their service operation on DC lines, insulators are prone to more accumulation of contaminants due to unidirectional electric field. The contaminants under wet conditions allow leakage current to flow on the insulator surface. Being organic in nature, polymeric insulators have a tendency to age under the combined effects of electrical and environmental stresses. To fully understand the long-term aging performance of DC composite insulators, a detailed survey was considered necessary. Towards that end, this paper critically summarizes worldwide experience of aging performance of composite insulators in the field as well as in laboratory conditions.
Highlights
Nowadays, High-voltage direct current (HVDC) technology is an energy-efficient and economical solution for transmission and distribution of bulk power over a large distance
This paper presents a worldwide survey of the field as well as the laboratory aging performance of the HVDC composite insulators and room-temperature vulcanized silicone rubber (RTV-SiR) coated insulators
An attempt has been made to review the long-term aging performance of DC composite insulators exposed to various stresses in the field as well as in laboratory multi-stressed conditions
Summary
HVDC technology is an energy-efficient and economical solution for transmission and distribution of bulk power over a large distance. The ATH filler (Al2O3·3H2O) enhances the resistance to tracking as well as erosion while silica imparts mechanical strength to the SiR [16] Both the HVDC technology and SiR insulators present many advantages for reliable operation of a power system. The accumulation of pollution is more in case of DC which reduces the flashover voltage of DC insulators [19] It is, necessary to conduct research and investigate the performance of DC composite insulators. This work is licensed under the Creative Commons due to different types of stresses (Ultraviolet (UV) radiations, heat, contamination etc) The performance of these insulators in service is strongly affected by the contamination accumulated on the surface as well as due to material aging. This paper presents a worldwide survey of the field as well as the laboratory aging performance of the HVDC composite insulators and room-temperature vulcanized silicone rubber (RTV-SiR) coated insulators
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