Capacitive Nondestructive Evaluation of Aged Cross-Linked Polyethylene (XLPE) Cable Insulation Material

2017 ◽  
pp. 87-97
Author(s):  
Z. H. Shao ◽  
N. Bowler
Keyword(s):  
Nondestructive Evaluation ◽  
Insulation Material ◽  
Cable Insulation ◽  
Xlpe Cable

Dielectric Response of Cross-Linked Polyethylene (XLPE) Cable Insulation Material to Radiation and Thermal Aging

2018 ◽  
Author(s):  
Zhihui Shao ◽  
Michael I. Byler ◽  
Shuaishuai Liu ◽  
Nicola Bowler ◽  
Leonard S. Fifield ◽  
...  
Keyword(s):  
Thermal Aging ◽  
Dielectric Response ◽  
Insulation Material ◽  
Cable Insulation ◽  
Xlpe Cable

Dielectric Response of Cross-Linked Polyethylene (XLPE) Cable Insulation Material to Radiation and Thermal Aging

2018 ◽  
Author(s):  
Zhihui Shao ◽  
Michael I. Byler ◽  
Shuaishuai Liu ◽  
Nicola Bowler ◽  
Leonard S. Fifield ◽  
...  
Keyword(s):  
Thermal Aging ◽  
Dielectric Response ◽  
Insulation Material ◽  
Cable Insulation ◽  
Xlpe Cable

scholarly journals Research on Mechanical, Physicochemical and Electrical Properties of XLPE-Insulated Cables under Electrical-Thermal Aging

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Dongxin He ◽  
Tao Zhang ◽  
Meng Ma ◽  
Wenjie Gong ◽  
Wei Wang ◽  
...  
Keyword(s):  
Power Systems ◽  
Aging Time ◽  
Degradation Mechanism ◽  
Dielectric Strength ◽  
Breakdown Field ◽  
Insulation Material ◽  
Oxidation Induction Time ◽  
Cable Insulation ◽  
Characteristic Index ◽  
Xlpe Cable

The stabilization of cross-linked polyethylene (XLPE) cables is crucial to the safe working of power systems. In order to investigate the aging characteristics of cable insulation in the process of operation, 10 kV XLPE cables were electrically-thermally aged at an AC voltage of 26.1 kV and three temperatures: 103°C, 114°C, and 135°C. Cable samples at five aging stages were cut into slices and tested to determine their mechanical, physicochemical properties and dielectric strength. The changes in these properties were analyzed in terms of aging time. The mechanical strength and oxidation induction time have the same changing trend of decrease, because the chemical bonds of the cable insulation material are fractured when the XLPE cable is aged. The AC space charge presented a trend of gradual accumulation with aging time. The breakdown field strength after AC voltage application decreases monotonically with aging time, which could be a characteristic index to evaluate the degradation degree of the cable insulation. This research contributes to the comprehension of degradation mechanism and discovery of aging assessment criteria, which is of great significance in assessments of insulation properties and fault detection on power cables.

Ageing Assessment of XLPE Cable Insulation by Residual Antioxidant Content

2020 ◽  
Vol 27 (6) ◽  
pp. 1795-1802
Author(s):  
Yuanyuan Zhang ◽  
Shengtao Li ◽  
Jian Gao ◽  
Shihang Wang ◽  
Kangning Wu ◽  
...  
Keyword(s):  
Cable Insulation ◽  
Xlpe Cable ◽  
Antioxidant Content

Effect of Electrical Aging on the Trap Parameter of HVAC XLPE Cable Insulation

2014 ◽  
Vol 672-674 ◽  
pp. 769-772
Author(s):  
Wei Wei Li ◽  
Qiang Shi ◽  
Chi Wu
Keyword(s):  
Crystallization Process ◽  
Melt Crystallization ◽  
Depolarization Current ◽  
Cable Insulation ◽  
Trap Charge ◽  
Xlpe Cable ◽  
Trap Parameter ◽  
Start Up ◽  
Electrical Aging ◽  
Two Peaks

The effect of electrical aging on the trap parameter of HVAC XLPE cable insulation was investigated in this work. Thermally Stimulated Current (TSC) was used to measure depolarization current. The variation of trap parameter was calculated by means of start-up method based on the Gaussian fitting curve of TSC data. It was found that, the activation energy and the amount of trap charge obtained from TSC peak at 243K and 348K were increased after electrical aging, which may be benefit to characterize the degree of aging. The amount of trap charge in the two peaks increases as the increase of oxide dipole after electrical aging. And charge trapped described by the TSC peak at melting temperature increased after aging. It is considered that the increase of charge in the TSC peak can be attributed to the release of trap charge in the melt crystallization process, which corresponds to the α relaxation process in XLPE insulation.

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