Open AccessCalculation of cable thermal rating considering non‐isothermal earth surface
Author(s) -
Purushothaman Sujit,
León Francisco,
Terracciano Matthew
Publication year - 2014
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2013.0721
Subject(s) - isothermal process , position (finance) , surface (topology) , fourier transform , heat transfer , thermal , computer science , power (physics) , simple (philosophy) , heat transfer coefficient , mathematics , mechanics , mathematical analysis , thermodynamics , physics , geometry , philosophy , finance , epistemology , economics
The study presents an algorithm to compute the heat transfer coefficient for thermal cable rating when modelling the non‐isothermal earth surface with the additional wall method. The position of the fictitious images is computed analytically by recognising that the complex geometrical arrangement can be converted into a much simpler one using the Fourier transform. This allows for the estimation of the heat transfer coefficient with simple formulas. The resulting equations are very easy to implement and are entirely compatible with the standardised methods (IEC and IEEE) for rating power cables. Hundreds of finite elements simulations have been performed to validate the proposed method which yielded results with typical differences of <5% for standard installations.