Methodology for Real-Time Calculation of Temperature Rise and Dynamic Ratings for Distribution System Duct Banks

Ben-Yaacov, G.; Bohn, J. G.

doi:10.1109/tpas.1982.317316

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…These parameters include the layer distribution of the model (γ ) and the number of layers (N ). The depth of the model (d m ) has a direct impact on the steady-state results, therefore to have an accurate model in both steady state and transient, the depth is fixed to the value determined by (13).…”

Section: Optimum-order Modelmentioning

confidence: 99%

“…The model calculated here has five layers and γ = 1.32. The radius of the cable for this example is r c = 0.053 m and the burial depth is L = 1 m. Then, using (13) one can calculate d m = 1.999 m. The next step is the calculation of the boundary positions of the soil discretization using (11). The results are listed in the first row of Table 3.…”

Section: Numerical Examplementioning

confidence: 99%

“…It is becoming increasingly necessary to perform accurate dynamic thermal calculations for emergency and real-time ratings [6]- [13]. The majority of these approaches follow the guidelines of the IEC standards to model transients IEEE Power and Energy Technology Systems Journal in underground cables.…”

Section: Introductionmentioning

confidence: 99%

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Ladder-Type Soil Model for Dynamic Thermal Rating of Underground Power Cables

Diaz‐Aguiló

León

Jazebi

et al. 2014

IEEE Power Energy Technol. Syst. J.

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This paper presents an optimal RC ladder-type equivalent circuit for the representation of the soil for dynamic thermal rating of underground cable installations. This is useful and necessary for their optimal and accurate real-time operation. The model stems from a nonuniform discretization of the soil into layers. The resistive and capacitive circuit elements are computed from the dimensions and physical parameters of the layers. The model is perfectly compatible with the International Electrotechnical Commission thermal-electric analog circuits for cables. The optimum model order is determined, for fast and slow thermal transients, from a comprehensive parametric study. It is shown that an exponential distribution of the soil layers leads to accurate results with differences of less than 0.5 • C with respect to transient finiteelement simulations. An optimal model with only five layers that delivers accurate results for all practical installations and for all time scenarios is presented. The model of this paper is a simple-to-use and accurate tool to design and analyze transient operation of underground cables. It represents a relevant improvement to the available operation and monitoring tools. For illustration purposes, a step-by-step model construction example is given. The model has been validated against numerous dynamic finite-element simulations.INDEX TERMS Ampacity, cable thermal rating, dynamic ratings, soil modeling, transient ratings, underground cable installations. NOMENCLATURE

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Section: Optimum-order Modelmentioning

confidence: 99%

Section: Numerical Examplementioning

confidence: 99%