Comparative evaluation by laboratory aging of 15 and 35 kV extruded dielectric cables

Katz, C.; Walker, Miles; Dyndul, J.

doi:10.1109/61.53088

Cited by 16 publications

(2 citation statements)

References 6 publications

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“…EPR miniature cable exhibits a higher and steady value for tan 6. A lower breakdown strength with a better retention by EPR miniature cables when compared to XLPE cables is in favourable agreement with the results published in the literature [5]. Of all the cables tested, filled XLPE cables had the best retention of breakdown strength after aging.…”

Section: Resultssupporting

confidence: 87%

Accelerated water tree tests on three layer miniature cables

Haridoss¹,

Shaikevitch²,

Bamji³

et al.

Conference Record of the 1992 IEEE International Symposium on Electrical Insulation

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AB 8 TRACTMiniature cables were extruded on a true triple extrusion line using conventional conductor shield, insulation shield and different insulation materials. As they were extruded the cables underwent continuous vulcarisation using steam at pressures 2 4 kg/cm . Suitable termination procedures were developed and used to subject these miniature cables to accelerated water tree growth tests. All tests were carried out at room temperature by immersing the cables in 0.1M NaCl solution and aging them at an average electrical stress of 6 kV/mm, at both 60 Hz and 1 kHz. Samples of the cables aged at 60 Hz test frequency were removed after a preset time and characterised by measuring the dielectric loss and ac breakdown strength. Aged cables were also sectioned after the breakdown test and examined for water trees.The 1 kHz test cables were allowed to age till breakdown.The ac breakdown strength of conventional crosslinked polyethylene (XLPE) insulated 15 kV cables were measured after accelerated water tree tests and compared to the results on miniature cables. For engineering purposes miniature cable tests at room temperature can predict the results for full-size cables under AEIC test methodology at a significantly lower cost. The miniature cables have been shown to be useful in comparing the dielectric performance of different insulation and semiconductive compounds for power cables.Accelerated aging tests on any insulating material used for power cables yield often conflicting results because of unrealistic test conditions and test sample.Test conditions closer to real service aging should, in theory, allow a more reliable approximation of the accelerated test results. Test samples closer to the geometry of the real size cables are also more desirable and expected to add to the validity of different accelerated test methodologies. This paper describes a true triple extrusion technique developed to produce miniature cables as a more desirable test sample for accelerated aging. The obvious benefits of a three layer extrusion system were retained along with an objective of following a system approach to develop materials for power cables.Miniature cables with thin overlays of the insulation alone have been shown to be useful 0-7803-0649-X/92 $3.00 0 1992 IEEE for research purposes [l] as well as for screening effectively the performance of new materials [ 2 -4 1 .A correlation between miniature and full-size cable testing based on extensive accelerated aging tests has also been established [ 3 ] .

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Section: Resultssupporting

confidence: 87%

Accelerated water tree tests on three layer miniature cables

Haridoss¹,

Shaikevitch²,

Bamji³

et al.

Conference Record of the 1992 IEEE International Symposium on Electrical Insulation

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“…[ 1,2,3,4,5] With one exception [6], involving a single service-aged EP cable, no similar studies have been made for ethylene propylene (EP) insulated cables. Even though the degradation of EP cables has been studied for many years in the laboratory, [7,8,9,10] no comparisons have been available with cables aged under actual service conditions. This report is an analysis of the present condition of 15 and 35 kV EPR insulated feeder cables that have been in service in the Houston Lighting & Power Company's ( € € U P ) system for up to 22 years.…”

Section: Introductionmentioning

confidence: 99%

An assessment of field aged 15 and 35 kV ethylene propylene rubber insulated cables

Katz

Walker²

1995

IEEE Trans. Power Delivery

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Data are provided from laboratory evaluations performed on ten 15kV and five 35kV ethylenepropylene copolymer rubber (EPR) feeder cables, made by one manufacturer and ranging in service age from 2 to 22 years.The evaluations consisted of visual examination of cable components, including the presence of water trees in the insulation and physical and electrical tests to establish changes which may have occurred in service. The data are used to establish an in-service rate of degradation for cables, up to 13 years in service, made with one type of EPR formulation. Based on an extrapolation of the breakdown voltage test results, it is expected that this type of cable will have a service life in excess of 30 years.

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Effect of water on aging of XLPE cable insulation

Nikolajevic

Drca

2001

Electric Power Systems Research

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Comparative evaluation by laboratory aging of 15 and 35 kV extruded dielectric cables

Cited by 16 publications

References 6 publications

Accelerated water tree tests on three layer miniature cables

Accelerated water tree tests on three layer miniature cables

An assessment of field aged 15 and 35 kV ethylene propylene rubber insulated cables

Effect of water on aging of XLPE cable insulation

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