Agustin, Fernando (2021) The Investigation of Tree-Retardant Ethylene Propylene Rubber Insulated Medium Voltage Cable as an Alternative Underground Cable for Victorian Power Distribution Network. PhD thesis, Victoria University.

Abstract

Cross-linked Polyethylene (XLPE) underground cables are widely used in Victorian power distribution networks due to its lower Dielectric Dissipation Factor (DDF) over Ethylene Propylene Rubber (EPR) cable. Advancement in compounding technology led to the reduction of DDF in some EPR proprietary material. This research investigated the viability of silane-cured low-DDF Tree-Retardant EPR (TR-EPR) cable as an alternative over standard XLPE cable in Victoria. The thermal ageing behaviour of TR-EPR was studied by means of laboratory-based experimentation using accelerated ageing test to observe the time variation of its mechanical properties: tensile strength and elongation at break. Measurements of Partial Discharge (PD) were also conducted prior and after cable heating at service temperature. The results of the thermal ageing test and PD measurements were visually presented through graphs and plots. For the thermal ageing, a theoretical life model was used with the parameters determined using Least Square Regression Method (LSRM). Data from the TR- EPR thermal ageing test were mathematically extrapolated to service temperature through the Arrhenius law to determine the extent of validity of the results. The economic viability of the TR- EPR was also analysed. The results obtained can be utilised by network operators and large industrial companies when designing their underground cable system and taking into consideration the reliability and economy of the power system.

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