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Crossing quantities: How to compare electrical strength performances of insulation compounds for power cables

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  • Marzinotto, M.
  • Mazzanti, G.
  • Mazzetti, C.

Abstract

An innovative theory—derived from the “enlargement law”—about how to compare the breakdown performances of power cable insulation compounds is illustrated and applied herein. This theory enables the selection between two different compounds candidate for the insulation of power cables via dielectric strength tests performed on cable models. In particular, compound performances are investigated vs. cable length looking for the so-called crossing length, i.e. a crossover point between the performances of the two compounds, such that one of the two performs better above this length, and conversely the other below it. The application of this theory consists in a comparison between two EPR compounds, based on lightning impulse breakdown tests realized on mini-cables, and shows that the crossing length depends strongly on cable size and voltage rating. Therefore, the practical selection of the best compound must consider the typical installation lengths of real cables.

Suggested Citation

  • Marzinotto, M. & Mazzanti, G. & Mazzetti, C., 2009. "Crossing quantities: How to compare electrical strength performances of insulation compounds for power cables," Energy, Elsevier, vol. 34(3), pages 245-253.
    • Handle: RePEc:eee:energy:v:34:y:2009:i:3:p:245-253
    DOI: 10.1016/j.energy.2008.07.011
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    References listed on IDEAS

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    1. M. Cacciari & G. Mazzanti & G. C. Montanari & J. Jacquelin, 2002. "A robust technique for the estimation of the two-parameter Weibull function for complete data sets," Metron - International Journal of Statistics, Dipartimento di Statistica, Probabilità e Statistiche Applicate - University of Rome, vol. 0(3-4), pages 64-92.
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