Introducing Mutual Heating Effects in the Ladder-Type Soil Model for the Dynamic Thermal Rating of Underground Cables

Diaz‐Aguiló, Marc; León, Francisco de

doi:10.1109/tpwrd.2015.2390072

Cited by 27 publications

(21 citation statements)

References 22 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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“…In the classical lumped parameter thermal model, representative environment condition is used. Some researchers proposed different approaches to consider the varying environmental condition [7], [13], [22]- [23]. However, in this paper the focus is on the thermal modeling of cable insulation.…”

Section: Discussion On the Classical Lumped Parameter Thermal Modelmentioning

confidence: 99%

“…To increase the power flow of a cable while still maintain a satisfied safety margin, dynamic thermal rating methods are proposed [8]- [12]. These methods calculate the maximum conductor operating temperature on the basis of instantaneous cable loading and environment conditions [13]- [15].…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Thermal Analysis of High-Voltage Power Cable Insulation for Cable Dynamic Thermal Rating

Wang

Liu

et al. 2019

IEEE Access

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Since cable insulation with low thermal conductivity occupies a large proportion of highvoltage cable, an optimization analysis on dynamic thermal behavior of cable insulation can be very useful to improve the accuracy of cable dynamic thermal rating. In this paper, the dynamic thermal analysis of cable insulation is carried out by combining the theoretical method and finite-element analysis (FEA) method. Based on the analysis, it is proved that using IEC recommended transient thermal model of cable insulation will bring certain error to cable dynamic temperature evaluation, especially at the early stage of cable temperature rise. Moreover, in this paper, an implementable optimization method for transient thermal model of cable insulation is developed. The improvement of the optimized model compared with the IEC model on cable dynamic thermal rating is verified by the FEA method. The results confirm that the optimized model can better model the dynamic thermal behavior of cable than the IEC model and the improvement is more obvious for dynamic thermal rating of cable with high voltage level and under large load. The methodology developed in this paper can pave a way for electricity utilities to increase cable utilization while still ensuring cable reliability.INDEX TERMS Dynamic thermal analysis, ampacity, high voltage power cable, transient thermal model, optimization.

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“…To improve the real-time thermal rating of power cables, more accurate and sometimes approximate models for the transient temperature calculation are needed. Significant are the models proposed in [58] and [129], aimed at accurately calculating the transient temperature to enrich a DTS system used for real-time DCR. In particular, a representation of the soil is proposed [58], and the presence of other cables in proximity has been considered and modelled [129].…”

Section: Real Time Dcrmentioning

confidence: 99%

Concepts and Methods to Assess the Dynamic Thermal Rating of Underground Power Cables

et al. 2021

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With the increase in the electrical load and the progressive introduction of power generation from intermittent renewable energy sources, the power line operating conditions are approaching the thermal limits. The definition of thermal limits variable in time has been addressed under the concept of dynamic thermal rating (DTR), with which it is possible to provide a more detailed assessment of the line rating and exploit the electrical system more flexibly. Most of the literature on DTR has addressed overhead lines exposed to different weather conditions. The interest in the dynamic thermal rating of power cables is increasing, considering the evolution of computational methods and advanced systems for cable monitoring. This paper contains an overview of the concepts and methods referring to dynamic cable rating (DCR). Starting from the analytical formulations developed many years ago for determining the power cable rating in steady-state conditions, also reported in International Standards, this paper considers the improvements of these formulations proposed during the years. These improvements are leading to include more specific details in the models used for DCR analysis and the computational methods used to assess the power cable’s thermal conditions buried in soil. This paper is focused on highlighting the path from the initial theories and models to the latest literature contributions. Attention is paid to thermal modelling with different levels of detail, applications of 2D and 3D solvers and simplified models, and their validation based on experimental measurements. A salient point of the overview is considering the DCR impact on reliability aspects, risk estimation, real-time calculations, forecasting, and planning with different time horizons.

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Introducing Mutual Heating Effects in the Ladder-Type Soil Model for the Dynamic Thermal Rating of Underground Cables

Cited by 27 publications

References 22 publications

Analytical Thermal Rating Method for Cables Installed in J-Tubes

Analytical Thermal Rating Method for Cables Installed in J-Tubes

Dynamic Thermal Analysis of High-Voltage Power Cable Insulation for Cable Dynamic Thermal Rating

Concepts and Methods to Assess the Dynamic Thermal Rating of Underground Power Cables

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