Reliability Evaluation of Improved Sampling Method for Mechanical Test of Cable Insulation

Seung-Won Lee (), Jin-Wook Choe, Ik-Su Kwon, Jin-Seok Lim, Byung-Bae Park and Hae-Jong Kim
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Seung-Won Lee: Power Cable Research Center, Korea Electrotechnology Research Institute, Changwon-si 51543, Republic of Korea
Jin-Wook Choe: Power Cable Research Center, Korea Electrotechnology Research Institute, Changwon-si 51543, Republic of Korea
Ik-Su Kwon: Power Cable Research Center, Korea Electrotechnology Research Institute, Changwon-si 51543, Republic of Korea
Jin-Seok Lim: Power Cable Research Center, Korea Electrotechnology Research Institute, Changwon-si 51543, Republic of Korea
Byung-Bae Park: Power Cable Research Center, Korea Electrotechnology Research Institute, Changwon-si 51543, Republic of Korea
Hae-Jong Kim: Power Cable Research Center, Korea Electrotechnology Research Institute, Changwon-si 51543, Republic of Korea

Energies, 2025, vol. 18, issue 4, 1-15

Abstract: Underground and submarine power cables are subjected to mechanical stress during installation and operation, which degrades the cable insulation and reduces the reliability of power transmission. Therefore, tests that can evaluate the mechanical properties of power cable insulation are very important. The purpose of this paper is to introduce an improved sampling method for the test sample, the peeling, for mechanical testing of power cable insulation and to evaluate the reliability of the method. The influence of the sampling method of the test sample on the mechanical property values was analyzed. The tensile strength and elongation of XLPE (cross-linked polyethylene) and PP (polypropylene) insulation prepared by the slice method and the peeling method were measured, and the surface of the test samples according to the sampling methods was photographed by SEM. The results show that the mechanical property of the cable insulation increased by more than 10% when the improved peeling method was used, and the precision of the peeling method was relatively better. The SEM analysis showed that the surface of the sliced test sample was rougher than the peeled test sample and was physically damaged. Therefore, the high reliability of the peeling method for mechanical testing of cable insulators was demonstrated.

Keywords: power cable; XLPE; PP; SEM; insulation; tensile strength; elongation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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