Life-time characteristics of EPR cable insulation under electrical and thermal stresses

Cao, L.; Grzybowski, S.

doi:10.1109/icsd.2013.6619873

“…The space charge distribution was usually obtained by pulsed electro-acoustic (PEA) method [7][8][9], pressure wave propagation (PWP) method [10] or thermal step method (TSM) [11]. Considering the different applications of EPR such as HVDC joints and HV cable, the ageing condition were commonly set as a single factor [10,12,13] or a multifactor [14,15]. The specific research work mainly includes the following parts.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal ageing on space charge in ethylene propylene rubber at DC voltage

Men

¹

,

Lei

²

,

Song

³

et al. 2019

IEEE Trans. Dielect. Electr. Insul.

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To understand the space charge characteristics of ethylene propylene rubber (EPR) used in MV/HV power cables under thermal stress, the space charge profile is measured by the pulsed electro-acoustic method under 20 kV/mm at 120 and 160 °C. The complex permittivity and physicochemical properties at the different ageing stages are measured and analyzed for an understanding of the effects of thermal ageing on space charge characteristics. The trap properties of EPR during thermal ageing is calculated and analyzed based on the space charge decay model. The results show that both the ageing time and temperature can affect the space charge characteristics of EPR. The space charge characteristics of EPR can be ascribed to the trapping sites caused by the complex chemical and physical structures during thermal ageing. Under the thermal oxygen process, the polar groups and ions increase because of the EPR molecular chain breakages, and the charge injection from the electrodes increases. Based on the decay model of space charge and isothermal decay current theory, the distribution of trap levels in EPR at different ageing stages is obtained. The trap distribution under different ageing process can be explained by the theory of trap filling.

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“…The space charge distribution was usually obtained by pulsed electro-acoustic (PEA) method [7][8][9], pressure wave propagation (PWP) method [10] or thermal step method (TSM) [11]. Considering the different applications of EPR such as HVDC joints and HV cable, the ageing condition were commonly set as a single factor [10,12,13] or a multifactor [14,15]. The specific research work mainly includes the following parts.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal ageing on space charge in ethylene propylene rubber at DC voltage

Men

¹

,

Lei

²

,

Song

³

et al. 2019

IEEE Trans. Dielect. Electr. Insul.

View full text Add to dashboard Cite

To understand the space charge characteristics of ethylene propylene rubber (EPR) used in MV/HV power cables under thermal stress, the space charge profile is measured by the pulsed electro-acoustic method under 20 kV/mm at 120 and 160 °C. The complex permittivity and physicochemical properties at the different ageing stages are measured and analyzed for an understanding of the effects of thermal ageing on space charge characteristics. The trap properties of EPR during thermal ageing is calculated and analyzed based on the space charge decay model. The results show that both the ageing time and temperature can affect the space charge characteristics of EPR. The space charge characteristics of EPR can be ascribed to the trapping sites caused by the complex chemical and physical structures during thermal ageing. Under the thermal oxygen process, the polar groups and ions increase because of the EPR molecular chain breakages, and the charge injection from the electrodes increases. Based on the decay model of space charge and isothermal decay current theory, the distribution of trap levels in EPR at different ageing stages is obtained. The trap distribution under different ageing process can be explained by the theory of trap filling.

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“…The analysis study was conducted on EPR and XLPE insulation of cables by using load cycling, thermal transients, and electro-thermal stress due to applied voltage and load cycles on the cable to identify the life estimation model while they are in service [6]. The analysis study of the dielectric properties of MV EPR cable insulation is using an experiment of applying electrical and thermal stresses on the cable that is designed for 15kV and 105° C. This determines the life time of the cable insulation and identified that the breakdown strength probability of cable insulation is 63.2 % with 15 minutes applied rated voltage from 70° C to 190° C and the time failed within 630 to 420 seconds [7]. Also the authors conducted a study in 2015 on 15kV XLPE cable insulation included EPR to identifying the age of the cable insulation by applying switching impulses to the cable and determining that at 10,000 switching impulses the cable insulation failed [8].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Analysis of the Remaining Useful Life of MV XLPE Cable: Case study of Oman Oil and Gas Power Grid

Qatan

¹

,

Farrag

²

,

Alkali

³

et al. 2018

2018 53rd International Universities Power Engineering Conference (UPEC)

3

0

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Cables are one of the main assets in the power grid particularly for distribution network where the loads are widely spaced, this is a vital issue in oil and gas power grid. Monitoring cables on-line is an impossible task due to the cost and the excessive number of distributed cables. In most of oil and gas production countries the ambient temperature hits 56 degree Celsius that adds to the failures of power cables and shorten the cables lifecycle and the hour to hour capacity. This paper presents the results of estimating the maximum operating temperature of the cable during different operating load and under different ambient temperature, it is anticipating its impacts on the cables lifecycle. This is compared to the cable manufacturer design specification associated with the normal operating temperature. The results identify the factors contribute significantly to the degradation of the physical insulation property of the cables. In this paper the response time in the thermal transient model is used to identify the remaining useful life (RUL) of the cable. The model is used as a diagnostic procedure to detect the degree of aging, the results show that RUL of underground cables is7.5 years and for overhead cables is13.3 years under ambient temperature of 47°C and maximum load current.

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Life-time characteristics of EPR cable insulation under electrical and thermal stresses

Cited by 9 publications

References 8 publications

Effect of thermal ageing on space charge in ethylene propylene rubber at DC voltage

Effect of thermal ageing on space charge in ethylene propylene rubber at DC voltage

Effect of thermal ageing on space charge in ethylene propylene rubber at DC voltage

Modeling and Analysis of the Remaining Useful Life of MV XLPE Cable: Case study of Oman Oil and Gas Power Grid

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