Abstract

In this paper, we studied the mechanical and thermal properties on slice XLPE sheet from 22 kV and 154 kV power cables. Interface structures are XLPE/semiconductor and XLPE/water/semiconductor. We evaluated mechanical property, thermal analysis, moisture analysis. Based on mechanical and thermal properties of the 22 kV XLPE sheet, elongation, mechanical strength, and melting point were evaluated to be 485.48 %, 1.74 kgf/$\textrm{mm}^2$ and $102.48^{\circ}C$, respectively. It was also evaluated from the mechanical and thermal properties of 154 kV XLPE sheet that elongation, mechanical strength, and melting point are 507.81 %, 1.8 kgf/$\textrm{mm}^2$, $106.9^{\circ}C$, respectively. A region shows a rapid increase in tension strength, and B region only shows increase in elongation under 1.0 kgf/$\textrm{mm}^2$, C region shows increase in both elongation and tension strength. Difference of melting point came from the chain of XLPE polymer and the difference of crystallization. Moisture density of semiconductor showed 800 ∼ 1200 ppm before extrude, 14000 ∼24000 ppm after extrude. These values were higher than the moisture density of XLPE (300∼560) ppm.

Keywords

• XLPE sheet;
• Semiconductor;
• Elongation;
• Mechanical and thermal properties

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References

1. CIGRE v.2 Reliability and Develop towards High Voltage of Synthetic Insulated Cables Devauw,A.;Oudib,J.M.;Rerolle,Y.;Jocteur, R. Noirclerc;A.Osty
2. Handbook of Electrical and Electronic Insulating Materials W. Tiller Shugg
3. IEEE Trans. Power Appr. Syst. v.94 no.3 High voltage Cables with extruded insulation and statistical controls and reliability evaluation Metra, P.;Occhini, E.;Portinari, G. https://doi.org/10.1109/T-PAS.1975.31930
4. IEEJ. Space Charge Effect on Electrical Breakdown In Polypropylene Film M. Fukuma;M. Nagao;M. Kosaki
5. IEEE Trans. Elec. Insul. v.4 no.6 Aging of polymeric insulation material in power cable C. Mayoux https://doi.org/10.1109/94.654573
6. IEEE Trans. Elec. Insul. v.24 no.5 Surface flashover of insulators H. Craig Miller https://doi.org/10.1109/14.42158
7. ICPADM 92 Breakdown Strength Affected by the Interface Roughness at the Semiconducting Layer in XLPE Poser Cables T. Okamoto
8. IEEE Electrical Insulation Magazine v.15 no.4 Dealing with interface problems in polymer cable termination Robert Ross https://doi.org/10.1109/57.776938
9. 3rd ICPADAM Technical Aspects of Interfacial Phenomena in Solid Insulating System H. C. Kaerner;M. Ieda
10. J. of KIEEME v.12 no.3 Dependency on temperature, electric field, pressure and dielectric properties of XLPE/EPDM D. H. Park;D. S. Kim;S. O. Han
11. J. of KIEEME v.17 no.3 The Thermal analysis of pole mount mold transformer with one-body molding by duct condition H. G. Cho;U. H. Lee;K. D. Park