Composite insulators and their aging: An overview

Amin, Muhammad; Akbar, M.S.; Salman, Muhammad

doi:10.1007/s11431-007-0053-x

Cited by 51 publications

(21 citation statements)

References 12 publications

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“…Silicone rubber used in high-voltage outdoor insulation can be divided into three main subcategories: high temperature vulcanized (HTV) silicon rubber, room temperature vulcanized (RTV) silicone rubber and liquid silicone rubber (LSR). HTV rubber cured at high temperature and pressure and catalyzed with peroxide or a noble metal, such as platinum, possesses an inherent hydrophobicity as well as superior electrical and mechanical properties [2,3]. Given that the accumulation of ice and pollution is responsible for numerous electrical and mechanical issues involving insulators exposed to these harsh environmental conditions, outdoor insulators should ideally have superhydrophobic and self-cleaning properties [2,4].…”

Section: Introductionmentioning

confidence: 99%

Direct replication of micro-nanostructures in the fabrication of superhydrophobic silicone rubber surfaces by compression molding

Maghsoudi

Momen

Jafari

et al. 2018

Applied Surface Science

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We describe a simple method for fabricating superhydrophobic high temperature vulcanized (HTV) silicone rubber surfaces by direct replication using a compression molding system. The resulting rubber samples possessed micro-nanostructures on the surface. This micro-and nanoscale roughness produced a water contact angle of >160º and a contact angle hysteresis of <3º. The roughness patterns on chemically etched aluminum surfaces, which served as templates, were successfully replicated on the rubber surfaces. An antistiction coating applied to the template surface ensured that the rubber was completely removed during demolding and that the replicated micro-nanostructures on the silicone surface were preserved. Surface roughness of the aluminum templates was optimized at HCl concentrations of 15 wt.%, with a lower roughness value observed at acid concentrations above and below this value. The developed HTV silicone rubber surfaces also demonstrated a freezing delay and a self-cleaning capacity.

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Section: Introductionmentioning

confidence: 99%

Direct replication of micro-nanostructures in the fabrication of superhydrophobic silicone rubber surfaces by compression molding

Maghsoudi

Momen

Jafari

et al. 2018

Applied Surface Science

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“…As a result, withstand capability of voltage reduces which can lead to flashover [11,12]. The surface properties of these materials are deteriorated by long-term exposure to these stresses, which adversely affect their service performance and also reduce the life expectancy of these insulators [13].…”

Section: Introductionmentioning

confidence: 99%

Global experience of HVDC composite insulators in outdoor and indoor environment

Akbar

Mehmood

2020

Reviews on Advanced Materials Science

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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.

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“…Several methods have been reported for assessing the aging status [5] of the sheds of composite insulators, such as direct observation method [6,7], water spray classification [8][9][10], leakage current method [11][12][13], contact angle method [14], thermally stimulated current method [15][16][17], etc. Direct observation method and water spray classification are easily influenced by the subjective judgment of maintenance personnel and therefore unstable.…”

Section: Introductionmentioning

confidence: 99%

Unilateral Mini NMR Sensor Used for Assessing the Aging Status of the Sheds of Composite Insulators

Xia¹,

Xu²,

Jian-hua³

et al. 2015

PIER M

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The number of composite insulators used in power transmission lines increases year by year. To detect and assess the aging status accurately concerns the security and stability of the power system. In order to achieve nondestructive testing of the sheds of composite insulators, a unilateral mini Nuclear Magnetic Resonance (NMR) sensor is proposed in this paper. The design of the magnet body and the optimization of the RF coil are presented. The Carr-Purcell-Meiboom-Gill (CPMG) sequence was employed to record the 1 H relaxation curves of the sheds of three composite insulators from 110 kv lines with different service years. The curves were fitted to both single exponential function and inverse Laplace transformation functions. The results demonstrate that an increase of service year of the insulator results in a decrease of the effective transverse relaxation time (T 2eff). It is indicated that the sensor has a potential to assess the aging status of the composite insulators.

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Composite insulators and their aging: An overview

Cited by 51 publications

References 12 publications

Direct replication of micro-nanostructures in the fabrication of superhydrophobic silicone rubber surfaces by compression molding

Direct replication of micro-nanostructures in the fabrication of superhydrophobic silicone rubber surfaces by compression molding

Global experience of HVDC composite insulators in outdoor and indoor environment

Unilateral Mini NMR Sensor Used for Assessing the Aging Status of the Sheds of Composite Insulators

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