On the mechanism of electrical aging of polymer insulation materials

Kerimli, Genber

doi:10.3103/s1068375514060052

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…Owing to many interfaces exist in multi-layer insulation, the process of charge transport becomes more complicated [ 4 , 5 , 6 ], especially under the operating conditions of high temperature or temperature gradient, the insulation material will undergo thermal aging, and the interface is more likely to cause insulation defects, resulting in deterioration and failure of electrical and mechanical properties [ 7 , 8 ]. Therefore, it is necessary to comprehensively study the differences in thermal mechanical, and electrical properties between single-layer and multi-layer insulation structures considering thermal aging and summarize the critical indicators for the aging evaluation [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Space Charge Behavior of Thermally Aged Polyethylene Insulation of Track Cables

Qiao

Wang³

et al. 2022

Polymers

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The interface of multi-layer insulation is a relatively weak point in the cable system during the long-term high-temperature service. Space charge is prone to continuously accumulate in the interface area, leading to the deterioration of electrical properties and even insulation failure in advance. The knowledge about thermal oxidation of polyethylene (PE) materials at the molecular level is still urgent to explore. Herein, single-layer and double-layer PE insulation, representing the typical insulation structure of frequency-shift pulse voltage track cables, were prepared and thermally aged in the oven for up to 360 h. Thermal, mechanical, electrical, and space charge characterizations were systematically carried out. Thermogravimetric analyzer and oxidation induced temperature (OIT) measurements confirmed that LDPE’s thermal-oxidative aging temperature range was the lowest among the three PE groups in the O2 atmosphere. After 360 h thermal aging, the tensile property of HDPE material kept relatively stable, while the elongation at break of the other two groups was lower than 50%. Unaged HDPE exhibits apparent charge injection and migration, leading to the severe electric field distortion of 20%. Noticeable charge accumulation can be observed at the unaged double-layer sample interface due to the mismatching of DC conductivity, which play a significant role in the aged double-layer samples. This work utilizes precise thermal analysis to provide new information about the resistance ability of thermal oxidation of LDPE, FPE, and HDPE, and its influence on space charge behaviors, which is helpful for the insulation design and evaluation in cable applications.

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Section: Introductionmentioning

confidence: 99%

Space Charge Behavior of Thermally Aged Polyethylene Insulation of Track Cables

Qiao

Wang³

et al. 2022

Polymers

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Lifetime Assessment of Electrical Insulation

Feilat¹

2018

Electric Field

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In this chapter, a review of the Weibull probability distribution, probability ranking, and the Weibull graphical estimation technique is presented. A review of single-stress and multiple-stress life models of electrical insulation is also introduced. The chapter also describes the graphical, linear and multiple linear regression techniques used in estimating the parameters of the aging models. The application of maximum likelihood estimation technique for estimating the parameters of combined life models of electrical insulation is illustrated.

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On the mechanism of electrical aging of polymer insulation materials

Cited by 2 publications

References 4 publications

Space Charge Behavior of Thermally Aged Polyethylene Insulation of Track Cables

Space Charge Behavior of Thermally Aged Polyethylene Insulation of Track Cables

Lifetime Assessment of Electrical Insulation

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