Aging phenomena in non-crosslinked polyolefin blend cable insulation material: Electrical treeing and thermal aging
Non-crosslinked polyolefin blends have become a favorable alternative material to crosslinked polyethylene (XLPE) cable insulation owing to their low power consumption in the production process and good recyclability at the end of service life. Although studies on non-crosslinked materials have achi...
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Published in | Frontiers in chemistry Vol. 10; p. 903986 |
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Language | English |
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Abstract | Non-crosslinked polyolefin blends have become a favorable alternative material to crosslinked polyethylene (XLPE) cable insulation owing to their low power consumption in the production process and good recyclability at the end of service life. Although studies on non-crosslinked materials have achieved significant results, the electrical and thermal aging properties of these materials undeniably need extensive research attention and systematic exploration. Aging performance is directly related to the lifetime and reliability of cables. In this study, the electrical treeing and thermal aging phenomena of 70 wt.% linear low-density polyethylene (LLDPE) and 30 wt.% high-density polyethylene (HDPE) blends (abbreviated as 70L–30H) were studied and compared with those of XLPE by investigating the microstructural feature, electrical treeing behavior, and mechanical performance during thermal aging. Electrical treeing tests show that 70L–30H blends exhibited smaller treeing dimensions and lower electrical tree growth rates than those of XLPE. Thermal aging tests exhibit that the mechanical property degradation of 70L–30H blends is less than that of XLPE under the same aging time. Through differential scanning calorimetry analysis and microstructure observation, the 70L–30H blend shows higher melting temperature, thicker lamellae, and higher crystallinity with a uniform and fine spherulite structure, which are responsible for good anti-aging performance. This study indicates that the blends exhibit better electrical and thermal aging resistance than XLPE, which provides a performance guarantee for its further application in the non-crosslinked cable system. |
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AbstractList | Non-crosslinked polyolefin blends have become a favorable alternative material to crosslinked polyethylene (XLPE) cable insulation owing to their low power consumption in the production process and good recyclability at the end of service life. Although studies on non-crosslinked materials have achieved significant results, the electrical and thermal aging properties of these materials undeniably need extensive research attention and systematic exploration. Aging performance is directly related to the lifetime and reliability of cables. In this study, the electrical treeing and thermal aging phenomena of 70 wt.% linear low-density polyethylene (LLDPE) and 30 wt.% high-density polyethylene (HDPE) blends (abbreviated as 70L–30H) were studied and compared with those of XLPE by investigating the microstructural feature, electrical treeing behavior, and mechanical performance during thermal aging. Electrical treeing tests show that 70L–30H blends exhibited smaller treeing dimensions and lower electrical tree growth rates than those of XLPE. Thermal aging tests exhibit that the mechanical property degradation of 70L–30H blends is less than that of XLPE under the same aging time. Through differential scanning calorimetry analysis and microstructure observation, the 70L–30H blend shows higher melting temperature, thicker lamellae, and higher crystallinity with a uniform and fine spherulite structure, which are responsible for good anti-aging performance. This study indicates that the blends exhibit better electrical and thermal aging resistance than XLPE, which provides a performance guarantee for its further application in the non-crosslinked cable system. |
Author | Xiaohan, Zhao Lisheng, Zhong Kai, Zhang Lunzhi, Li Jinghui, Gao |
AuthorAffiliation | 2 State Key Laboratory of Electrical Insulation and Power Equipment , Xi’an Jiaotong University , Xi’an , China 1 School of Electronic and Control Engineering , Chang’an University , Xi’an , China |
AuthorAffiliation_xml | – name: 1 School of Electronic and Control Engineering , Chang’an University , Xi’an , China – name: 2 State Key Laboratory of Electrical Insulation and Power Equipment , Xi’an Jiaotong University , Xi’an , China |
Author_xml | – sequence: 1 givenname: Li surname: Lunzhi fullname: Lunzhi, Li – sequence: 2 givenname: Gao surname: Jinghui fullname: Jinghui, Gao – sequence: 3 givenname: Zhong surname: Lisheng fullname: Lisheng, Zhong – sequence: 4 givenname: Zhang surname: Kai fullname: Kai, Zhang – sequence: 5 givenname: Zhao surname: Xiaohan fullname: Xiaohan, Zhao |
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Cites_doi | 10.1063/1.333931 10.1023/a:1018617200285 10.1109/CEIDP.2002.1048950 10.3390/ma11101922 10.1002/1099-0488(20000901)38:17<2309:aid-polb110>3.0.co;2-7 10.1109/tdei.2019.8726021 10.1016/j.polymer.2010.12.008 10.3389/fmats.2020.00130 10.6028/jres.066a.003 10.1109/tdei.2019.008198 10.1002/pol.1966.110040504 10.1063/1.5053416 10.1002/polb.10228 10.3389/fmats.2019.00206 10.1109/tdei.2013.6451335 10.1002/app.27889 10.1109/tdei.2015.7076762 10.1246/bcsj.38.1881 10.1016/j.polymdegradstab.2009.04.025 10.1109/tdei.2015.7076758 10.1002/app.35177 |
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Notes | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Reviewed by: Francesco Paolo La Mantia, Consorzio Interuniversitario Nazionale Per La Scienza E Tecnologia Dei Materiali, Italy Xavier Colin, ParisTech École Nationale Supérieure d’Arts et Métiers, France Edited by: Alfonso Jiménez, University of Alicante, Spain This article was submitted to Polymer Chemistry, a section of the journal Frontiers in Chemistry |
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Title | Aging phenomena in non-crosslinked polyolefin blend cable insulation material: Electrical treeing and thermal aging |
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