Thermo-mechanical analysis of solid interfaces in HVAC cable joints

Hamdan, Mohammad, Anan, Pilgrim, James and Lewin, Paul (2019) Thermo-mechanical analysis of solid interfaces in HVAC cable joints. IEEE Transactions on Dielectrics & Electrical Insulation, 26 (6), 1779-1787. (doi:10.1109/TDEI.2019.008152).

Record type: Article

Abstract

Mechanical stresses affect the electrical performance of solid-solid interfaces in highvoltage cable joints. This paper assesses the influence of insulation material mechanical properties and temperature on interface pressure. Based on a hyper-elastic model, the mechanical stresses inside silicone rubber joint tube were determined. Circumferential stresses can reach 50% of the silicone rubber tensile strength at normal pre-operation expansion ratios. An analytical method to determine the thermally induced mechanical stress during operation is presented and its accuracy is confirmed using finite element method. This method is modified to account for the variation of the mechanical properties with temperature. This paper shows that circumferential stresses at the interface increase as temperature drops, which may have a significant impact on the
electrical performance of the interface during operation.

Text

8152 proofed# - Accepted Manuscript

Available under License University of Southampton Accepted Manuscript Licence.

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