A Study on Microvoids and Their Filling I Crosslinked Polyethylene Insulated Cables

Namiki, Yuka; Shimanuki, H.; Aida, Fumio; Morita, Machiko

doi:10.1109/tei.1980.298276

Cited by 17 publications

(5 citation statements)

References 4 publications

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“…The results were fitted by using Eq. (22) in order to extract K D . Consequently, trapping rate constant, K T , and trap density in the bulk of an insulation, N T , can be acquired by substituting the extracted values into Eq.…”

Section: Resultsmentioning

confidence: 99%

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The electro-mechanical effect from charge dynamics on polymeric insulation lifetime

2015

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For polymeric material used as electrical insulation, the presence of space charges could be the consequence of material degradations that are thermally activated but increased by the application of an electric field. The dynamics of space charge, therefore, can be potentially used to characterize the material. In this direction, a new aging model in which parameters have clear physical meanings has been developed and applied to the material to extrapolate the lifetime. The kinetic equation has been established based on charge trapping and detrapping of the injected charge from the electrodes. The local electromechanical energy stored in the region surrounding the trap is able to reduce the trap-depth with a value related to the electric field. At a level where the internal electric field exceeds the detrapping field in the material, an electron can be efficiently detrapped and the released energy from detrapping process can cause a weak bond or chain scission i.e. material degradation. The model has been applied to the electro-thermally aged low density polyethylene film samples, showing well fitted result, as well as interesting relationships between parameter estimates and insulation morphology.

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Section: Resultsmentioning

confidence: 99%

“…This can be explained by using the electrostriction coefficient (α), 22 which is approximately equal to ε 0 ε r . The electromechanical stress is given as:…”

Section: B Model In the Presence Of Electro-thermal Stressmentioning

confidence: 99%

The electro-mechanical effect from charge dynamics on polymeric insulation lifetime

2015

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“…Also, the rhombus represents data obtained from a combined analysis method. (14) From the experimental results of the XLPE lifetime under electrical field stresses at specific temperatures in Fig. 6, an inflection point was found at a certain electrical field stress (E d ).…”

Section: Methodsmentioning

confidence: 94%

“…In the experiment, the XLPE lifetime was investigated in accordance with the previous literature. (13,14) The influence of electrical field stress at temperatures of 20, 60, and 90 °C was examined since the maximum operating temperature of the XLPE cables is approximately 90 °C. The cross-sectional dimensions of a cable with 20 cm length are shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

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Engineering Lifetime Model of Crosslinked Polyethylene under Electrical and Thermal Stresses

Pramualsingha¹,

Yutthagowith²

2021

Sensors and Materials

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This paper presents an effective engineering lifetime model of crosslinked polyethylene (XLPE), which was subjected to electrical field stresses in the range of 7 to 90 kV/mm and temperatures of 20 to 90 °C. The inversed power model (IPM) is widely used for estimating the lifetime of XLPE under the influence of high electrical field stress at a constant operating temperature or under an accelerating aging test. However, it was previously found that the IPM is not appropriate when XLPE is subjected to both low electrical and thermal stresses, which is similar to the actual conditions of power cables installed in electrical power transmission systems. From the experimental results of the lifetime of XLPE under electrical field stresses at specific temperatures, an inflection point was found at a certain electrical field stress (E d ). From this observation and based on a physical interpretation, an engineering lifetime model was derived by separation of the lifetime curve into two parts, i.e., for electrical field stresses of lower than E d and higher than E d . Nonlinear and linear least-squares methods were applied to fit the developed model with the experimental data, and the parameters of the developed engineering lifetime model were determined. With the developed model, the maximum electrical field stress at the maximum operating temperature can be determined, and it was utilized as a criterion in the design of power cables as an example in this study.

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Failure Mechanisms in XLPE Cables

Notingher

Stancu

Pleșa

2021

Crosslinkable Polyethylene

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A Study on Microvoids and Their Filling I Crosslinked Polyethylene Insulated Cables

Cited by 17 publications

References 4 publications

The electro-mechanical effect from charge dynamics on polymeric insulation lifetime

The electro-mechanical effect from charge dynamics on polymeric insulation lifetime

Engineering Lifetime Model of Crosslinked Polyethylene under Electrical and Thermal Stresses

Failure Mechanisms in XLPE Cables

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