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Transient heating of buried cables

Transient heating of buried cables

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The paper develops exact methods of computing the thermal performance of buried cables, based on a solution of the relevant differential equations given by Jaeger in 1956.The approach differs from that of other workers, who have used approximate methods of calculation. It is shown that the integrals occurring in the exact solution only require a small amount of computation, and if there is very great demand for this information, it could easily be codified by one of the national computing organizations.The results obtained by the exact method are compared with those of other workers, particularly Whitehead and Hutchings (1938), and it is shown that, although their methods are generally satisfactory, they can lead to large discrepancies in particular cases, especially for small heating times. Calculations are made for a particular cable to show the application of the method.

References

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      • J.C. Jaeger . Conduction of Heat in an Infinite Region Bounded Internally by a Circular Cylinder of a Perfect Conductor. Australian Journal of Physics
    2. 2)
      • E. Bullard . The Flow of Heat through the Floor of the Atlantic Ocean. Proceedings of the Royal Society A
    3. 3)
      • H.S. Carslaw , J.C. Jaeger . (1947) Conduction of Heat in Solids.
    4. 4)
      • C.J. Tranter . Heat Flow in an Infinite Medium Heated by a Cylinder. Philosophical Magazine
    5. 5)
      • S. Whitehead . An Approximate Method for Calculating Heat Flow in an Infinite Medium Heated by a Cylinder. Proceedings of the Physical Society
    6. 6)
      • S. Whitehead , E.E. Hutchings . Current Rating of Cables for Transmission and Distribution. Journal I.E.E.
    7. 7)
      • G. Grünberg , M. Sontz . The Calculation of Short-Circuit Heating of H. V. Cables. Journal of Physics of the the U.S.S.R.
    8. 8)
      • G. Grünberg . Short-Circuit Heating of H.V. Cables. Journal of Physics of the the U.S.S.R.
    9. 9)
      • E. Jahnke , F. Emde . (1945) Tables of Functions.
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