NDLI: Thermal and mechanical properties analysis for EHV XLPE cables with different operating years

Content Provider	IEEE Xplore Digital Library
Author	Pan Luo Yang Xu Xiao Gu Yanqun Liao Jiangjing Cui Zhihua Lu Zhigang Ren
Copyright Year	2013
Description	Author affiliation: Zhuhai Power Supply Bur., Zhuhai, China (Yanqun Liao; Jiangjing Cui; Zhihua Lu) \|\| Beijing Electr. Power Res. Inst., Beijing, China (Zhigang Ren) \|\| State Key Lab. of Electr. Insulation & Power Equip., Xi'an Jiaotong Univ., Xi'an, China (Pan Luo; Yang Xu; Xiao Gu)
Abstract	Analysis of the properties of cable materials operated for different years is beneficial for more accurate modeling of life-expectancy and asset management. The aggregation state, thermal stability, and mechanical properties of insulation materials were researched for 110 kV and 220 kV cross-link polyethylene (XLPE) cables out of service in China. The slices cut from the cable were analyzed through the Differential scanning calorimetry (DSC), Thermogravimetry (TG), Fourier transform infrared spectrum (FTIR), and mechanical property analysis. Compared with new cable, the initial melting temperature of melting peak for cables operated for more than 10 years were shifted by approximately 10 °C to the lower temperature direction as obtained from the DSC results. The crystallinity, crystal size and its distribution have changed. The crystallization rate of the operated samples increased with operation year, which means that some bonds of the crosslink points were broken. From the thermal stability analysis by TG and FTIR, only some samples presented a certain extent of thermal oxidation aging. The elasticity modulus and fracture energy showed a slight decrease of the operated cables. However, the other mechanical parameters such as elongation at break, yield strength and fracture strength showed no evident difference between the new and the operated cables.
Sponsorship	IEEE Dielectr. Electr. Insul. Soc.
Starting Page	47
Ending Page	51
File Size	207656
Page Count	5
File Format	PDF
ISBN	9781479925971
DOI	10.1109/CEIDP.2013.6748249
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-10-20
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power cables Power cable insulation Crystallization Aging
Content Type	Text
Resource Type	Article

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