The Transient Temperature Rise of Buried Cable Systems

Neher, Jack

doi:10.1109/tpas.1964.4765976

Cited by 42 publications

(7 citation statements)

References 8 publications

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“…The model presented in this paper (hereafter referred to as the analytical solution) has been validated with hundreds of finite element model (FEM) simulations. There is in the literature substantial experimental verification of the IEC standard calculations for underground cables [16][17][18] and FEM simulations [19,20]. Our FEM calculations match very well with those experiments.…”

Section: Introductionsupporting

confidence: 72%

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Calculation of cable thermal rating considering non‐isothermal earth surface

Purushothaman

León²,

Terracciano³

2014

IET Generation, Transmission & Distribution

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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.

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Section: Introductionsupporting

confidence: 72%

“…The heat source location is corrected by distance x such that the cable core surface is an isotherm. By using (17) to evaluate and equate the top and bottom temperatures of the cable core, T top and T bot , we obtain…”

Section: Point Source Correctionmentioning

confidence: 99%

Calculation of cable thermal rating considering non‐isothermal earth surface

Purushothaman

León²,

Terracciano³

2014

IET Generation, Transmission & Distribution

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“…To extend his former publications, in 1964, Neher presented a mathematical solution for a two-loop network representing the equivalent thermal network of a cable in duct [41]. In this thermal network, the thermal capacitance of the insulation is redistributed between the conductor and the sheath using the improved method of [33].…”

Section: Autogrounddesignmentioning

confidence: 99%

Power Cable Rating Calculations - A Historical Perspective [History]

Holyk¹,

Anders²

2015

IEEE Ind. Appl. Mag.

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“…The backfill volumetric heat capacity is calculated through an empirical formula (10), initially proposed by Neher [16]. ) and ρ soil is the soil mass density (kg.m -3 ).…”

Section: A Model Parametersmentioning

confidence: 99%

Numerical thermo-mechanical stress analysis for HVDC cables

Huang

Pilgrim

Lewin

et al. 2014

2014 IEEE Electrical Insulation Conference (EIC)

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-Calculating the current rating of paper insulated HVDC cables under low ambient temperatures can require additional mechanical considerations. Under rapid cable heating or cooling processes, an extremely high mechanical stress or a rapid pressure drop can develop due to the strong impregnant thermal expansion or contraction respectively. This may cause plastic deformation of the sheath or the creation of voids. This paper demonstrates the importance of this thermo-mechanical constraint through the application of finite element modelling techniques which permit a coupling of the thermal and mechanical properties within the cable. The results show that the FEA technique can be fully applied to analyze the internal thermo-mechanical stress distribution of the cable and calculate the resulting mechanical stress-limited rating, which provides an alternative to an analytical method previously developed by the same author.

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The Transient Temperature Rise of Buried Cable Systems

Cited by 42 publications

References 8 publications

Calculation of cable thermal rating considering non‐isothermal earth surface

Calculation of cable thermal rating considering non‐isothermal earth surface

Power Cable Rating Calculations - A Historical Perspective [History]

Numerical thermo-mechanical stress analysis for HVDC cables

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