Ampacity Calculations for Deeply Installed Cables

Dorison, E.; Anders, G.J.; Lesur, Frédéric

doi:10.1109/tpwrd.2009.2033961

Cited by 13 publications

(8 citation statements)

References 3 publications

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“…At present an internationally recognized standard (IEC 60287 [4] [5]) presents a collection of analytical methods to predict the thermal rating of numerous typical onshore cable installations. In recent years many studies have presented new or updated methods to predict the thermal ratings of non-standard installation [6] [7] as well as obtaining a more accurate rating by considering a more complete set of physical processes [8] [9] and better representing the thermal impact of the surrounding medium [10] [11]. At present there is no standard method for rating the section of cable in the protective J-tube between the sea floor and the offshore platform.…”

Section: Introductionmentioning

confidence: 99%

Analytical Thermal Rating Method for Cables Installed in J-Tubes

Chippendale

Pilgrim

Goddard

et al. 2017

IEEE Trans. Power Delivery

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Abstract--One possible thermal pinch point along the route of a wind farm export circuit is a J tube, commonly used to provide mechanical protection to cable sections between the sea floor and the offshore platform. Current ratings for such cable sections are not covered by the scope of IEC 60287, while the existing publications covering such systems have limitations. This paper presents an updated 2D analytical method and a 3D extension for the rating of J tubes with short air section lengths. Continuous rating comparisons have been made against a 3D finite element model which shows a 4.5% variation in rating from the 2D analytical model for air section lengths greater than 10 m, rising to 13% for short air section lengths. With the addition of longitudinal heat transfer within the new 3D analytical approach this variation decreases by 2.5%. Both methods proposed can be solved readily using conventional spreadsheet tools and are broadly compliant with the IEC 60287 methodology.Index Terms-Power cable insulation, Power transmission, Wind energy integration, Wind farms, Modelling, offshore installations.

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Section: Introductionmentioning

confidence: 99%

Analytical Thermal Rating Method for Cables Installed in J-Tubes

Chippendale

Pilgrim

Goddard

et al. 2017

IEEE Trans. Power Delivery

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“…The parameters T A is used to express T α and Q A representing Q α to maintain the correct response of short duration. The parameters T B and Q B can be expressed as follows [18,19],…”

Section: Computation Of the Steady State And Transient Cable Ratingmentioning

confidence: 99%

Transient Thermal Performance of Power Cable Ascertained Using Finite Element Analysis

2021

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This paper presents the computation of the cable ampacity and the temperature distribution through long duration based on the equivalent thermal circuit based on IEC 60287 standard and the Finite element method using COMSOL (Multiphysics environment, version 5.5). This study investigated the cable ampacity and the temperature rise of the cable core and sheath at steady state and emergency conditions. The cable ampacity was investigated at different conditions such as the variation of cable depth, soil properties, and soil temperature. The results confirmed the adaptation between the thermal circuit results and the COMSOL results as well as the effectiveness of using the numerical method to compute the cable ampacity. Using the COMSOL-based thermal properties evaluations, the transient performance of the cable is ascertained. The transient study is performed for different cable loading currents and dry zone sizes.

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“…As it is known the losses of power cables produce heat increases the cable temperature. The thermal stability around the cable is necessary to keep the cable conductor and insulation temperatures within the allowable limits [1][2][3][4]. Because of the soil temperature increase, the surrounding back-fill soils around underground power cables lose their moisture content, forming dry areas [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Soil thermal resistivity is affected mainly by soil composition, degree of compaction, dry density, gradation, water content and temperature rise [1][2][3][4][5][6][7][8][9][10]. The problem of coupled heat and water flows around buried cables was investigated by several authors [11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%