Improved physical model of electrical lifetime estimation for crosslinked polyethylene AC cable

Bian, Haoran; Yang, Lijun; Ma, Zhipeng; Deng, Bangming; Zhang, Haibing; Wu, Zhaoguo

doi:10.1109/tdei.2019.008351

Cited by 16 publications

(6 citation statements)

References 18 publications

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“…It is considered that XLPE aging is caused by electrons accelerated by electrical field stress through sub-microvoids (SMVs), resulting in damage to the polymer chains. (11,12) The SMV size will suddenly increase when XLPE cables are subjected to high electrical field stress (E > E d ). In this case, ∆W is proportional to temperature as follows:…”

Section: Physical Meaning Of the Vecmentioning

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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Section: Physical Meaning Of the Vecmentioning

confidence: 99%

“…The lifetime of XLPE can be obtained by a combined stress model (CSM), as previously reported. (4,(10)(11)(12)(13)(14)(15) This model was derived from the physical meaning of each parameter and has high accuracy. However, both the IPM and CSM require a large amount of experimental data for predicting the lifetime.…”

Section: Introductionmentioning

confidence: 99%

Engineering Lifetime Model of Crosslinked Polyethylene under Electrical and Thermal Stresses

Pramualsingha¹,

Yutthagowith²

2021

Sensors and Materials

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“…n is related to the voltage endurance characteristics of the material, so n is physically related to R′. According to the Eyring equation, Bian et al [20] expressed the relation between R′ and n as (7), where R 0 is the reaction rate constant when E = 1 kV/mm.…”

Section: Physical Function Of Nmentioning

confidence: 99%

“…The ageing process described by IPM is essentially that the materials obtain energy from the electric field, produce a series of the local reactions. The local reaction and reaction rate follow the transition state theory describing the reaction path of the chemical reactions [20]. Thus, IPM can also be explained by transition state theory.…”

Section: Understanding the Decrease In The Value Of N Under Thermal Ageingmentioning

confidence: 99%

“…According to the Eyring equation, Bian et al . [20] expressed the relation between R ′ and n as (7), where R 0 is the reaction rate constant when E = 1 kV/mm.

R^{normal′} = R_{0} E^{n}

Thus, on the basis of (5) R 0 can be written as

R_{0} = \frac{k_{normalb} T}{h} e^{- ((Δ G - Δ W |_{E = 1}) / k_{b} T)}

Substituting (6) and (8) into (7) results in the following:

n = \frac{normalΔ W - normalΔ W (|, _{E = 1})}{k_{normalb} T \cdot \ln E}

Under 1 kV/mm, the reaction rate of XLPE ageing is extremely low. Therefore, ΔW| E= 1 is negligible.…”

Section: Understanding the Decrease In The Value Of N Under Thermal Ageingmentioning

confidence: 99%

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Understanding and predicting the DC voltage endurance coefficient of cross-linked polyethylene insulation under thermal ageing

Bian

Yang

Zhang

et al. 2020

IET Science, Measurement &Amp; Technology

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Voltage endurance coefficient (VEC) is a parameter used in the design of withstand test and insulation thickness of cross-linked polyethylene (XLPE) cables. Thermal ageing is inevitable in operation of cable, but the thermal ageing effect on the VEC is rarely considered. In this study, the trend of VEC of XLPE films under DC voltage during thermal ageing is investigated by 120 and 135°C thermal ageing experiments. The results show that, after 14 days of 120 and 135°C thermal ageing, the VEC decreases from 20.74 to 7.05 and 3.93, respectively. To understand the effect of thermal ageing on the VEC, the VEC is described as a function of the free energy increment which is proportional to the degree of polymerisation (DP) and the electric field. A simulation calculating the free energy increment of several molecular chains is conducted to confirm the proportional relationship between the free energy increment and the DP, the electric field. Based on the function of the VEC, a predicting method for the VEC under thermal ageing is developed. The experimental results of 120 and 135°C thermal ageing are used to confirm the preciseness of the proposed predicting method.

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Partial discharge diagnosis and remaining useful lifetime in XLPE extruded power cables under DC voltage: a review

Fikri

Abdul‐Malek

2023

Electr Eng

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Improved physical model of electrical lifetime estimation for crosslinked polyethylene AC cable

Cited by 16 publications

References 18 publications

Engineering Lifetime Model of Crosslinked Polyethylene under Electrical and Thermal Stresses

Engineering Lifetime Model of Crosslinked Polyethylene under Electrical and Thermal Stresses

Understanding and predicting the DC voltage endurance coefficient of cross-linked polyethylene insulation under thermal ageing

Partial discharge diagnosis and remaining useful lifetime in XLPE extruded power cables under DC voltage: a review

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