Performance and ageing of polymeric insulators

Sorqvist, T.; Vlastós, A.E.

doi:10.1109/61.634187

Cited by 71 publications

(24 citation statements)

References 9 publications

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“…After aging in environmental stress, the surface layer of SR materials degrades [3,4]. Consequently, the hydrophobicity decreases.…”

Section: Resultsmentioning

confidence: 99%

“…However, environmental stress and contamination could exert a large degradation effect on the outdoor composite insulators so that the surface of insulator could degrade, hydrophobicity could decrease, the contaminant properties could be cut down, and tracking and discharge could occur to lead to failure, breakdown or flashover of insulation [1][2]. A lot of literature have reported the degradation of outdoor polymer insulating materials aged in artificial environmental stress and in field service [4][5].…”

Section: Introductionmentioning

confidence: 99%

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Evaluating Silicone Rubber Materials and Fillers for Outdoor Insulator Housings and Sheds in Accelerating Aging of Environmental Stress

1999

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SUMMARYThe comparison tests between two types of silicone rubber (SR) materials such as a high temperature vulcanized silicone rubber (HTVSR) and a modified silicone rubber (MSR) by ethylene-vinyl-acetate (EVA), and two fillers such as alumina trihydrate (ATH) and magnesia hydrate (MH) are made in the accelerating aging of artificial environment stress, i. e. high temperature, ultraviolet (UV) ray exposure, corona, acid rain, and water-absorbing. The surface appearance, hydrophobicity, and tracking resistance of samples before and after aging are assessed. The degradation characteristics of base rubber materials and the effect of fillers are discussed furthermore. Research results show that in the designed environmental stress, HTVSR performs better than MSR, and that the sample with ATH filler performs better than that with MH filler. Acid rain and water-absorbing have little effect on the tracking resistance of SR. The degradation effect of UV-ray exposure is largest among the environmental stresses. The hydrophobicity and tracking resistance of HTVSR are not affected in thermal stress. The EVA composition in MSR makes it weaker to resist environmental stress. This research may provide a reference for the further modification of SR to meet the needs of application in more severe outdoor environment and contamination.

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“…After aging in environmental stress, the surface layer of SR materials degrades [3,4]. Consequently, the hydrophobicity decreases.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluating Silicone Rubber Materials and Fillers for Outdoor Insulator Housings and Sheds in Accelerating Aging of Environmental Stress

1999

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“…The intense absorption at around 1000-1100 cm -1 can be assigned to the Si-0-Si stretching, which shows no significant alteration, indicating that the samples can recover their hydrophobicity easier, than the new samples [18] . In the case of aged SR in salt spray and in the field, there was a great reduction in absorbance intensity of bands originated from Si-CH 3 and CH 3 vibration compared with new samples spectrum [19] .…”

Section: Dscmentioning

confidence: 99%

Effect of artificial aging on polymeric surge arresters and polymer insulators for electricity distribution networks

et al. 2011

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Abstract:A study was conducted to evaluate new and laboratory-aged samples of surge arresters and anchorage polymeric insulators, for 12 and 24 kV networks, which are used by the Rio Grande Energia (RGE). Power Utility Polymeric compounds were analyzed by Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TG), Dynamic-Mechanic Analysis (DMA), Fourier Transformed Infrared Spectroscopy (FTIR) and Scanning Electronic Microscopy (SEM) to verify changes in the insulator properties due to degradation occurred during the experiments. The analyses were carried out before and after 6 months of aging in laboratory devices (weatherometer, 120 °C, salt spray, immersion in water). After the aging experiments, high-voltage electrical tests were also conducted: a radio interference voltage test and, simultaneously, the total and the internal leakage currents were measured to verify the surface degradation of the polymeric material used in the housing. The impulse current test was applied with current values close to 5, 10 and 30 kA, in order to force an internal degradation. Results showed that only surface degradation is detected at the polymer. The main properties of the parts were not affected by the aging. It confirms that polymer insulator and surge arrestor are appropriate for use in electricity distribution networks.

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“…The environmental contamination could exert a large degradation effects on the outdoor composite insulators so that the contamination properties of insulator could degrade, and tracking and discharge could occur to lead to breakdown or flashover of insulation [1,2]. The degradation effect of acid rain on the contamination performances of outdoor polymer insulating materials has called attention of power engineers.…”

Section: Introductionmentioning

confidence: 99%

“…It is said that only the severe acid can initiate the degradation of silicone rubber materials [9]. An increase of the conductive contaminants on the energized insulator surface can cause a large increase of the surface leakage current and the discharge heat in dry band arcing [1,2], so that the influence of conductivity of acid rain should be taken into account. Although there have been some studies on the effects of artificial acid rain on the silicon rubber materials [9,10], the mechanism and extent of influence of ion concentration, pH, and conductivity of acid rain are not yet known, and the relation between the aging effect of the artificial acid rain and that of the actual acid rain in field needs to be studied.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Aging Effects of Ion Concentration, pH and Conductivity of Acid Rain on Contamination Performances of Silicone Rubber Insulator

1999

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Acid rain is the precipitation of pH lower than 5.6, of which the main features are ion concentration, acidity pH, and conductivity. As there exit a considerable variety of acid rains originated from different sources, the characteristics of acid rain are different in various industry areas. Although there have been some studies on the erosion effects of artificial acid rain on the insulating materials, the mechanism and extent of influences of ion concentration, pH, and conductivity of varied acid rain remain to be resolved. In this paper, the degradation effect of acid rain on the high temperature vulcanizing silicone rubber (HTVSR) insulator is investigated by the accelerated aging of artificial acid rain. The influences of ion concentration, pH, and conductivity of acid rain on the material structure, hydrophobicity, and surface discharge current of insulator are respectively studied.Experimental results reported here show that conductivity of acid rain mainly induces the tracking and discharge on the energized insulator surface, and the acidity pH affects the inorganic filler in silicone rubber. The erosion effect of acid rain on the energized insulator is more severe than that on the insulator without applying voltage.Variation of conductivity hardly has influence on the insulator without applying voltage. Although the insulator surface degrades with the increasing of ingredient concentration, when the ion concentration is too high, the degradation of insulator has a trend toward saturation. The ingredient concentration of actual acid rain exerts an insignificant effect on the degradation of silicone rubber insulator. Owing that the atom bond structure of Si-O bond in silicone rubber has a high band energy, silicone rubber insulator presents a large resistance to the varied acid rain.

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Performance and ageing of polymeric insulators

Cited by 71 publications

References 9 publications

Evaluating Silicone Rubber Materials and Fillers for Outdoor Insulator Housings and Sheds in Accelerating Aging of Environmental Stress

Evaluating Silicone Rubber Materials and Fillers for Outdoor Insulator Housings and Sheds in Accelerating Aging of Environmental Stress

Effect of artificial aging on polymeric surge arresters and polymer insulators for electricity distribution networks

Assessing the Aging Effects of Ion Concentration, pH and Conductivity of Acid Rain on Contamination Performances of Silicone Rubber Insulator

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