Keywords
cable line
emergency mode
temperature conditions
cable operation time under safe conditions кабелі зі зшито-полімерною ізоляцією,
кабельна лінія
аварійний режим
температурні режими
час роботи кабелю в безпечному режимі
How to Cite
Abstract
The paper proposes new knowledge in cable engineering by studying the operation of up-to-date high-voltage cable line under the non-nominal and emergency conditions to ensure its reliability and service life. The temperature conditions for operation of an underground 110 kV three-phase cable line with cross-link polymer insulated cables in the nominal and emergency modes of short circuit and short-term overload of cables are studied by computer finite-element method. A number of practically important problems that take place when designing such cable lines are solved. In particular, the computation of the three-phase short-circuit mode in the line are carried out taking into account its re-activation after a short circuit with a certain time delay (5, 10 and 15 s) and at different loads – 50% and 100% of the nominal current. The results obtained allow determining the permissible operating time for the line operation with the temperature of the cable cores not higher than the permissible limit value. The nature of the increase in the temperature of the cables within the time of different current overloads varying from 120% to 200% is investigated. The results give a possibility to determine the permissible operating time of the line when the temperature of the cable core does not exceed 1300С. In the case of the two-circuit cable line, the computational results for non-stationary thermal process under emergency condition of one circuit failure and the transmission of double power through the other circuit are presented. It is shown that the limiting core temperature of 1300C is reached after 1.3 hours of operation of such a line. The problems solved in the paper answer the questions regarding the thermal stability of the high-voltage cable line in emergency modes and are of interest to designers of such lines as well as organizations responsible for their safe operation and power companies for more efficient use of power cable lines. References 36, figures 5, tables 2.
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