Experimental investigation and signal processing techniques for degradation assessment of XLPE and PVC/B materials under thermal aging

Kemari, Y.; Mekhaldi, A.; Teguar, M.

doi:10.1109/tdei.2017.006399

Cited by 24 publications

(17 citation statements)

References 23 publications

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“…One particularly issue of interest is that to establish an accurate relationship between the LC and pollution severity while the insulator is in service. Authors in [22]- [24] have predicted the pollution severity by analysing the statistical values of the LC such as the mean, maximum and the standard deviation (STD). Using these parameters, the dimensions and severity of the pollution layer is estimated.…”

Section: Introductionmentioning

confidence: 99%

Risk Assessment of Polluted Glass Insulator Using Leakage Current Index Under Different Operating Conditions

et al. 2020

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In this paper, an innovative approach to assess the risk of uniform/non-uniform pollution and wet high voltage glass insulator is proposed. The assessment is based on a new index, named as R hi , which is derived from the 3 rd , 5 th and 7 th harmonics of the leakage current. Two 33 kV strings of cap and pin glass insulators having three units with different profiles are employed to evaluate the risk level, based on measured critical voltage gradient (Ec). Critical voltage stress tests are executed on the contaminated insulators under different ratios of lower to upper surface (J) and wetting rates. Furthermore, the effects of ratio of soluble deposit density (ESDD) to non-soluble deposit density (NSDD) on the flashover occurrence are analyzed. It was found that the insulator profile has significant influences on the likelihood of flashover which is estimated as 38% and 24% for type A and B insulators, respectively. From the results, it can be concluded that the proposed R hi index is able to predict the risk level of the insulator and the probability of flashover occurrence more accurately than the 5th/3rd index, which is widely published in literature. INDEX TERMS Polluted insulators, Risk assessment, leakage current harmonics, Fast Fourier Transform, glass insulator.

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Section: Introductionmentioning

confidence: 99%

Risk Assessment of Polluted Glass Insulator Using Leakage Current Index Under Different Operating Conditions

et al. 2020

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“…Polymeric insulators have an active and important place in transmission and distribution of electricity. In this context, the significance of the aging phenomena that occur in the insulation materials used in the medium and high voltage cables and also the importance of the development of the insulation materials have emerged [1][2][3]. Crosslinked polyethylene (XLPE) has an important and influential role as a polymeric insulator material in medium and high voltage cable applications since it has good physical, chemical and electrical properties.…”

Section: Introductionmentioning

confidence: 99%

“…Crosslinked polyethylene (XLPE) has an important and influential role as a polymeric insulator material in medium and high voltage cable applications since it has good physical, chemical and electrical properties. XLPE insulated cables are widely used for electrical transmission and distribution networks [1,[4][5][6][7][8][9][10]. Although XLPE material is a good electrical insulator material, aging is inevitable after a certain period of time.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Electric Field and Potential Distribution of Experimental Setup for Initiating and Growing Vented Type Water Trees Using Finite Element Method

2020

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Water treeing phenomenon has an important and effective role in the service life of polymeric insulators used in the transmission and distribution of electricity. Water trees can be described as permanently localized degradations or damages that can occur in the presence of electric field and humidity. XLPE is widely used as a polymeric insulator material in medium and high voltage cable applications. An experimental setup was prepared to initiate and grow water trees artificially in a laboratory environment and the tests were performed in accordance with the actual values. The electrical and dielectric values of the test material were used for a detailed analysis with high accuracy. The magnitude of the electric field, which was defined by varying the distance between the water needles formed in the XLPE material and the aluminium plate electrode, has been analyzed for various conditions. After laboratory experiments, electric field and potential distribution were simulated and analyzed by FEM (Finite Element Method) using FEMM (Finite Element Method Magnetics) software package. Experiments revealed clearly, that even small changes in the shape of water needle can dramatically affect the electric field and hence the lifetime of the insulator. By using FEMM, both of these parameters (electric field and potential distribution) can be calculated rapidly with high accuracy. HVDC power cables play a significant role in electric power transmission, hence by using the previously described experimental setup, electric field and potential distribution were simulated and analyzed under DC voltage.

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“…Therefore, XLPE has become the focus of global attention in the cable industry . However, under the service conditions, XLPE insulations may undergo irreversible changes after their exposition to multiple effects of stressing factors such as temperature, pollution, humidity, and irradiation exposure to sunlight or ionizing rays . The stressing factors lead to the insulation properties degradation and a significant reduction in the effective operation life of the cables .…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet radiation aging impact on physicochemical properties of crosslinked polyethylene cable insulation

Hedir

Moudoud

Lamrous

et al. 2019

J of Applied Polymer Sci

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This article deals within the study of the effect of artificial radiations on physical and chemical properties of the crosslinked polyethylene (XLPE) material, widely used for manufacturing high-voltage cables. Within this framework, several experimental tests, using essential characterization techniques, were performed to study XLPE behavior under ultraviolet (UV) aging. Attenuated total reflection Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, X-ray diffraction, and scanning electron microscopy were thus carried out to identify the main structure changes of the material before and after exposure to UV. In addition, appearance changes and DC (Direct Current) volume resistivity were evaluated. The obtained results showed that UV radiation has a great effect on the physicochemical properties of XLPE cable insulation.

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Experimental investigation and signal processing techniques for degradation assessment of XLPE and PVC/B materials under thermal aging

Cited by 24 publications

References 23 publications

Risk Assessment of Polluted Glass Insulator Using Leakage Current Index Under Different Operating Conditions

Risk Assessment of Polluted Glass Insulator Using Leakage Current Index Under Different Operating Conditions

Analysis of Electric Field and Potential Distribution of Experimental Setup for Initiating and Growing Vented Type Water Trees Using Finite Element Method

Ultraviolet radiation aging impact on physicochemical properties of crosslinked polyethylene cable insulation

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