FA9B17D4d01 - IEEE Transactions on Power Delivery Vol 12 No...

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IEEE Transactions on Power Delivery, Vol. 12, No. 1, January 1997 15 A Comparison belween XLPE and EPR as Insulating Materials for HV Cables G. Mazzanti, Member, IEEE G. C. Montanari, Senior Member, IEEE Diparthento di Ingegneria Elettrica, University of Bologna, Viale Risorgimento 2,40 136 Bologna, Italy Abstract-The performances of XLPE and EPR as materials candidate for insulation of high voltage power cables are investigated. Data obtained from laboratory tests performed on cable models aged under single thermal and electrical stresses, as well as under the combination of the two stresses, are considered. The drawing of eleci rical, thermal and multi-stress life lines provides a synthetic and exhaustive description of the behavior of the tested materials, :and allows the determination of endurance indices, useful for electrical, thermal and multi-stress characterization. I. INTRODiUCTION Cross-linked Polyethylene (XLPE) is likely the most popular polymeric material among high voltage (HV) cable manufacturers and electrical utilities all over the world. It is commonly used as the insulation for power cables operating up to the highest levels of service voltage. The recent developments in manufacturing of XLPE-insulated cables, e.g. triple extrusion, dry curing and extra-clean manufacturing, has led to the design and operation of 500 kV XLPE insulated cables [l], and gives XLPE the chance of competing with the oil-paper insulation. On the other hand, the improvements in cable- manufacturing techniques and in production of polymer compounds and additives has considerably raised the performances of other materiads suitable for application in high voltage systems, parl icularly Ethylene-Propylene Rubber (EPR). This material is standardized as insulation for medium-voltage distribution cables in many countries [2-41, and is widely employed in some of them (e.g. in Italy), showing good electrical, thermal, mechanical and environmental behavior [5-81. However, in order to compete with XLPE in the HV field (up to 130 kV), EPR must feature large values of design electrical field and current rating, besides, of course, acceptable losses. 96 WM 216-2 PWRD A paper recommended and approved by the IEEE Insulated Conductors Committee of thi: IEEE Power Engineering Society for presentation at the 1996 IEEEPES Winter Meeting, January 21-25, 1996, Baltimore, MD. Manuscript submitted July 26, 1995; made available for printing January 15, 1996. A comparison between XLPE and EPR from the viewpoint of their use in HV cables requires accurate knowledge of their endurance characteristics under the expected service stresses, among which electric field and temperature (as well as the combination of the two), are the most challenging ones. Electro-thermal endurance characterization is based on a large number of short and long-term life tests, that must be realized according to suitable procedures. The relevant data must be processed by means of appropriate statistical tools, and life models, valid for single and multiple stresses, are
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This note was uploaded on 06/08/2011 for the course ELECTRICAL 124 taught by Professor Ghjk during the Spring '11 term at Institute of Technology.

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FA9B17D4d01 - IEEE Transactions on Power Delivery Vol 12 No...

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