Abstract
The article addresses problems faced in designing medium voltage fire resistant power cables. These cables must operate reliably during 30–40 years under the influence of relatively strong electric field, long-term heating up to 90 оC, and short-term heating up to 130 оC. These cables must also retain serviceability for a limited period of time when subjected to a flame source with a temperature of (830±40) оC. The article presents the key state-of-the-art electrical characteristics of these cables (dielectric strength, dielectric loss angle tangent in the delivery state, etc.), the thermal ageing resistance test procedure, the results of studies of long-term electrical strength (life curves) of fire-resistant cable models, and the fire resistance proper of results test. The article also proposes a mathematical model of the processes that take place in performing fire-resistance tests of medium voltage cables. The obtained modeling results are in qualitative agreement with the experimental data.
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