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Experimental Determination of Load Current of Cables with Impregnated–Paper Insulation in the Steady-State Thermal Mode

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Abstract

An experimental study of heating of cables with impregnated- paper insulation and aluminum-alloy cores with a cross section of 70, 95, and 120 mm2 was performed. A scheme for supplying and measuring electric current using a laboratory autotransformer and a current transformer is described. The scheme of temperature measurement on various parts of the cable structure is described. The load currents at which the temperature of the cable core reaches values of 90 and 95°С are determined. For these stationary modes, temperatures were measured on the surfaces of cores, metal sheaths, and cables. The resistances of the conductive cores for cable segments were determined, and the resistances were recalculated for a temperature of 20°С and a cable length of 1 km in order to compare with the data specified in the national standard. The power of heat losses in conductive veins during the flow of a given electric current is calculated. The thermal resistances of insulation and air for the considered load conditions, as well as the specific thermal resistance and the specific thermal conductivity of the insulation, are calculated using the thermal replacement circuit of the cable. A mathematical model of heat- and mass-transfer processes during one of the stages of the experiment is constructed. To verify that the model is adequate, the difference between the temperature of the cable core obtained using the numerical method and determined experimentally is determined.

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Authors and Affiliations

  1. Perm National Research Polytechnic University, 614990, Perm, Russia

    I. B. Kukharchuk, A. E. Terlych & N. M. Trufanova

Authors
  1. I. B. Kukharchuk
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  2. A. E. Terlych
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  3. N. M. Trufanova
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Correspondence to I. B. Kukharchuk.

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Translated by K. Gumerov

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Kukharchuk, I.B., Terlych, A.E. & Trufanova, N.M. Experimental Determination of Load Current of Cables with Impregnated–Paper Insulation in the Steady-State Thermal Mode. Russ. Electr. Engin. 92, 654–658 (2021). https://doi.org/10.3103/S1068371221110080

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  • DOI: https://doi.org/10.3103/S1068371221110080

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