Accelerated aging and flashover tests on 138 kV nonceramic line post insulators

Schneider, H.; Guidi, W.W.; Burnham, J.T.; Gorur, R.S.; Hall, J.F.

doi:10.1109/61.180353

Cited by 111 publications

(19 citation statements)

References 4 publications

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“…It can be expected that the flashover strength of insulators when there is no time for hydrophobicity recovery will be inferior to those when some recovery has occurred. Aging is known to make the surfaces of insulators less hydrophobic [5]. Hence the results shown in Table 2 can be assumed to represent worst case conditions.…”

Section: Evaluation Proceduresmentioning

confidence: 99%

“…But this is not to say that the surface has never lost its original hydrophobicity. Transition from a hydrophobic to a hydrophilic state in service and recovery of the temporarily lost hydrophobicity, have been reported in the literature, along with the relevant mechanisms responsible for these transitions [5,17].…”

Section: Hydrophobicity Recovery and Surface Resistancementioning

confidence: 99%

“…Another factor that motivated this study was the fact that there have been flashovers of some types of nonceramic insulators in service, which did not flashover at even higher levels of contamination in the IEC clean fog test [5,6]. This suggests that perhaps there are certain limitations in the standard tests, and possibly differences in the flashover process that can occur in service, when compared to that causing flashover in the clean fog test.…”

Section: Introductionmentioning

confidence: 99%

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Flashover of contaminated nonceramic outdoor insulators in a wet atmosphere

Gorur

1998

IEEE Trans. Dielect. Electr. Insul.

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This paper deals with the flashover mechanism and performance of contaminated nonceramic (also known as composite and polymeric) outdoor insulators under wet conditions. Two types of wetting that occur in service, namely fog and rain, were considered. Different profiles of line insulators having weathersheds made from material families such as, high temperature vulcanizing (HTV) silicone rubber (SRI and ethylene propylene (EP) diene monomer rubber, were evaluated. The results demonstrate that the performance, and hence the relative ranking of nonceramic line insulators is influenced by the wetting mode and insulator geometry; that flashover of contaminated insulators can occur with rain at a much lower contamination severity than with fog; and that the mechanism of Contamination flashover under rain is significantly different from that under fog condensation. New insulator profiles have been identified and tested to show that they can provide improved flashover performance, when compared to existing designs. This work proves that a comprehensive evaluation of outdoor insulator performance can be obtained by performing flashover tests that include more than one form of wetting, and hence illustrates the limitations of current standard contamination tests that employ only one form of insulator wetting.

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Section: Evaluation Proceduresmentioning

confidence: 99%

Section: Hydrophobicity Recovery and Surface Resistancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flashover of contaminated nonceramic outdoor insulators in a wet atmosphere

Gorur

1998

IEEE Trans. Dielect. Electr. Insul.

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“…The use of non-ceramic insulators increased significantly in last five decades. Polymeric insulators both in service [5] and high voltage laboratory tests [6] demonstrated better performance than ceramic insulators in contaminated environmental conditions. Initially, non-ceramic insulators prevent water filming on the surface due to their hydrophobic properties, but this resistance gradually decreases due to physical and chemical changes in the polymeric materials which can lead to dry band arcing and surface discharges [7,8].…”

Section: Introductionmentioning

confidence: 99%

Risk Assessment of Failure of Outdoor High Voltage Polluted Insulators under Combined Stresses Near Shoreline

et al. 2017

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Abstract:The aim of this paper is to investigate the various effects of climate conditions on outdoor insulators in coastal areas as a result of saline contamination under acidic and normal cold fog, determining significant electrical and physico-chemical changes on the insulator surface and considering the effect of discharge current, electric field distribution and surface roughness. To replicate similar conditions near the shoreline, experimental investigations have been carried out on insulation materials with the combined application of saline contamination and acidic or normal cold fog. The test samples included silicone rubber (SiR), ethylene propylene diene monomer (EPDM) and high-density polyethylene (HDPE), which were used as reference. The materials are of the same composition as those used in real-life outdoor high voltage insulators. All samples were aged separately in an environmental chamber for 150 h for various saline contaminations combined with acidic and normal cold fog, and were generated by means of the adopted experimental setup. This analysis represented conditions similar to those existing near the shoreline exposed to saline and acid spray during winter and early spring. Electric field and discharge current along polymeric samples were examined under acidic and normal cold fog. Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopic (SEM) were used to probe the physico-chemical changes on the samples surface and investigate the hydrophobicity recovery property after aging tests. Finally, a comparative study was carried out on polymeric samples before and after being exposed to the acidic and normal cold fog based on the results obtained from the experiment. Research data may provide references for the better prediction of surface degradation as well as for the better material coating and design of external insulation.

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“…Figure 2 shows the results of a survey done by CIGRE to investigate the global distribution of composite insulators at voltage levels above 69 kV, indicated that GCC is one of the regions where composite insulators are gaining ground [5,6] . Polymeric materials are badly affected by environmental stresses like UV-radiations, heat, contaminations and moisture [2,7,9] . The weather conditions in the Middle East including Saudi Arabia are significantly harsh and changing from the daytime to the night.…”

Section: Introductionmentioning

confidence: 99%

Degradation of High Voltage Polymeric Insulators in Arid Desert's Simulated Environmental Conditions

Khan¹

2009

American J. of Engineering and Applied Sciences

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Problem statement: High Voltage (HV) polymeric insulators are replacing ceramic insulator commonly used for HV outdoor networks due to their ease of handling, reliability and cost. However, their long term performance and reliability are major concerns to power utilities. Approach: To investigate their performance in arid desert's conditions, two types of HV composite insulators were aged as per International Electrochemical Commission (IEC) standard-61109. Additional test samples were subjected to accelerated aging conditions simulating the actual Ultraviolet (UV) radiation intensity and temperature in the inland desert. Results: This study described the experimental results of the effects of thermo electric stress and UV radiations on the polymeric insulators aged under two conditions i.e., as per IEC standard and modified IEC standard that simulates the inland arid desert. The tests results after the artificial accelerated aging indicated that the dielectric response of thermoplastic insulators under the tested thermo-electric cum UV-irradiations outperforms Silicone rubber insulators. Conclusion: From the obtained results it will be easy to assess the performance and suitability of composite insulators for their applications in arid desert environments.

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Accelerated aging and flashover tests on 138 kV nonceramic line post insulators

Cited by 111 publications

References 4 publications

Flashover of contaminated nonceramic outdoor insulators in a wet atmosphere

Flashover of contaminated nonceramic outdoor insulators in a wet atmosphere

Risk Assessment of Failure of Outdoor High Voltage Polluted Insulators under Combined Stresses Near Shoreline

Degradation of High Voltage Polymeric Insulators in Arid Desert's Simulated Environmental Conditions

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