Multi-stress aging investigations of HTV silicone rubber filled with Silica/ATH composites for HVAC and HVDC transmission

Akbar, M.S.; Ullah, Rahmat; Qazi, Ibrahim

doi:10.1016/j.engfailanal.2020.104449

Cited by 21 publications

(13 citation statements)

References 23 publications

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“…However, Leakage current same pattern was observed in SiR type insulators in [31]. However, if compared with 2000 h testing results of studies in [31,37,38], SiR sample insulators offered high resistance to leakage current.…”

Section: Results Discussionsupporting

confidence: 55%

Influence of load-shedding and night on SiR insulator environmental aging under AC test voltages

et al. 2021

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Insulators play a critical role in healthy transmission under the influence of operational stresses (OSs). OSs include environmental stresses (ultraviolet-radiations, seasonal heat and humidity variations, and pollution (inert and active), etc.) and electrical stresses (electric field distribution, corona, etc.). OSs can deteriorate insulators, jeopardizing the healthy transmission. In this experimental study, four silicon rubber (SiR) insulators with different concentrations of micro and nano-silica fillers are tested in a specially designed and fabricated compact environmental chamber for 1920 h under OSs, un-scheduled load shedding, and night factors for more realistic field insulators deterioration characteristics. Insulators' potential distribution, electrical field distribution, hydrophobicity, and leakage current characteristics are considered. Experimental results reveal OSs affected insulators' leakage current profile due to hydrophobicity loss and electric field distribution variations. Moreover, SiR insulators under OSs regained insulation characteristics due to heavier inner molecule replacement to the dissipated and degraded outer lower weight insulating molecules. This property provides a reusability opportunity for SiR insulators in power system networks, unlike traditional insulators.

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Section: Results Discussionsupporting

confidence: 55%

Influence of load-shedding and night on SiR insulator environmental aging under AC test voltages

et al. 2021

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“…This could be due to the different blends of the materials (fillers) that each manufacturer uses. It has been proven from previous research works that the shore A hardness measurements of the housing material of composite insulators are affected in a proportional way with the concentration of the ATH filler [20,21,27]. In this manner, it seems that B1, B2, D1, D2, E1 and F1 insulators might have higher ATH filler concentrations than A1, A2, C1 and C2 insulators.…”

Section: Shore a Hardness Measurementmentioning

confidence: 91%

“…Regarding the shore A hardness measurements on composite insulators, in Table 3 some results from other investigations [8,[20][21][22]27] are presented as well as the results of this paper. More specifically, Table 3 includes information about the range of shore A hardness measurement on new (unused-unaged) HTV silicone rubber with ATH filler, which is used as composite insulators' housing material.…”

Section: Shore a Hardness Measurementmentioning

confidence: 96%

“…More specifically, Table 3 includes information about the range of shore A hardness measurement on new (unused-unaged) HTV silicone rubber with ATH filler, which is used as composite insulators' housing material. A remarkable comment is that in some investigations, the type of test pieces used for the hardness measurement is not mentioned [27]. Hence, the results of these studies cannot be compared with the ones of other studies.…”

Section: Shore a Hardness Measurementmentioning

confidence: 99%

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A Proposal for the Evaluation of HTV Silicone Rubber Composite Insulators

2021

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This paper describes in detail a step-by-step methodology for obtaining specimens from the housing material (high temperature vulcanized (HTV) silicone rubber with aluminum trihydrate (ATH) filler) of composite insulators (finished products), for five well known and commonly used tests. The aim of the paper is to render practical clarifications and additions to the instructions for five tests on composite insulators provided by international standards. Additionally, the ranges of the results of these tests are presented. More specifically, shore A hardness measurement, tensile strength and elongation at break test, tear strength test, density measurement and inclined plane test were conducted on the housing material of ten, new, unaged medium voltage composite insulators made by six different manufacturers. The results of these tests are presented as a contribution to the existing knowledge and a comparative study of corresponding results of previous investigations is performed. The presented procedures for specimens’ preparation, as well as the results (arithmetical ranges), could be used as guidelines for future testing on the housing material (HTV silicone rubber with ATH filler) of composite insulators, either by researchers and manufacturers, during laboratory testing and material development processes, or by customers (distribution and transmission networks owners), during batch acceptance tests.

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“…Rahmat have done a lot of work to study the physical and chemical properties of polymer material. The hydrophobicity, mechanical test, leakage current test, Fourier infrared spectroscopy (FTIR) and scanning electron microscope (SEM) test are analyzed to study the influence of the multi-stress aging on high temperature vulcanized silicone rubber [ 14 – 16 ]. It is indicated that these analysis methods can be used to evaluate its performance and characterize the surface state.…”

Section: Introductionmentioning

confidence: 99%

Study on ageing characteristics and evaluation methods of RTV silicone rubber in high humidity area

et al. 2021

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Due to high humidity, the ageing of room temperature vulcanized silicone rubber (RTV) has been a serious problem in Southwestern China. In order to solve the problem of RTV life prediction, the aging classification method was established by analyzing the microtopography of RTV samples in this paper. Besides, the comprehensive analysis of RTV element content, partial element content ratio, and major chemical groups of RTV samples in each aging level were conducted. It is found that as the ageing level increases, the element contents of C, Si, O, Al change accordingly and the ratio of C:Si drops from 2.39 to 1.54, and absorption peaks of the chemical groups of Si-(CH3)2, Si-O-Si, Si-CH3 and C-H in CH3 decrease. This work can enrich the investigation of RTV, and may provide useful reference for performance evaluation and replacement of RTV in substations.

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Multi-stress aging investigations of HTV silicone rubber filled with Silica/ATH composites for HVAC and HVDC transmission

Cited by 21 publications

References 23 publications

Influence of load-shedding and night on SiR insulator environmental aging under AC test voltages

Influence of load-shedding and night on SiR insulator environmental aging under AC test voltages

A Proposal for the Evaluation of HTV Silicone Rubber Composite Insulators

Study on ageing characteristics and evaluation methods of RTV silicone rubber in high humidity area

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