Nonlinear-Coupled Electric-Thermal Modeling of Underground Cable Systems

Kovač, Nikša; Sarajčev, Ivan; Poljak, Dragan

doi:10.1109/tpwrd.2005.852272

Cited by 35 publications

(25 citation statements)

References 35 publications

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“…A mesh-current method is applied in order to determine the unknown conductor filament currents in (3), e.g., [12,16,17,18]. Each mesh is represented by a loop consisting of: 1) the associated phase conductor or shield filament; 2) the associated voltage and the load impedance of the phase, if the loop contains the phase conductor filament and 3) the ground return path.…”

Section: Current Distributionmentioning

confidence: 99%

“…Above mentioned self and mutual impedances (including the ground return path) for the loops involving filaments of the phase conductors and shields, as well as the various mutual impedances involved, are computed on the basis of the well-known Carson theory (simple closedform approximations for the overhead wires in the lowfrequency range are used), see e.g., [12,16,18,19,20,21,22]. It should be mentioned that the resistance of each of the filaments involved is taken as a function of the operating temperature; phase conductors and shields will have different operating temperatures (although they might be of the same material).…”

Section: Current Distributionmentioning

confidence: 99%

“…Additionally, inclusion of the terminal conditions on the so-called generating and the load sides of the high-current busduct (or GIL system) have been explained in detail in [12,16,18,22] and, thus, will not be repeated here. It could be stated that they allow for different operating conditions of the high-current bus duct (or GIL) system to be simulated, from normal symmetrical operation to unbalanced loads, to various possible short circuit events.…”

Section: Current Distributionmentioning

confidence: 99%

“…These equations were in-fact derived by the application of the well-known Stefan-Boltzman formula for the radiative heat transfer, where various constants have been experimentally obtained, see [25] for additional information and necessary explanations. The system of the two obtained non-linear equations, given by (15) and (16) for the phase L1, are numerically solved for the temperatures of the phase conductors and shields; along with the associated non-linear equations for the other two phases (giving 3x2=6 non-linear equations in total). This is here carried-out by the modified Powell hybrid algorithm and a finite-difference approximation to the associated Jacobian matrix, which has been implemented in the developed computer program by the appropriate subroutines of the IMSL library [27].…”

Section: Power Losses and Temperature Increasementioning

confidence: 99%

See 3 more Smart Citations

Coupled Electromagnetic and Thermal Analysis of Single-Phase Insulated High-Current Busducts and GIL Systems

Sarajčev¹,

Martinac²,

Radic³

2013

AJEEE

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This paper presents a mathematical model for the coupled electromagnetic and thermal analysis of the single-phase insulated high-current busducts of circular cross-section geometry and of gas-insulated transmission lines (GIL). The mathematical model, accompanied by a numerical solution procedure, features an exact current distribution in phase conductors and shields of the busduct or GIL system, accounting for the skin and proximity effects, and including the complete electromagnetic coupling between phase conductors and shields. The current distribution is based on the conductor filament method in combination with the mesh-current method. The mathematical model further couples the analysis of current distribution with the computation of (Joule) power losses and subsequent temperature increase in the high-current busducts or GIL systems, accounting for the material properties (electrical conductivity, thermal emission and convection coefficients) as well as for the surrounding ambient properties (ambient temperature, wind and solar radiation influences).

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Section: Current Distributionmentioning

confidence: 99%

Section: Current Distributionmentioning

confidence: 99%

Section: Current Distributionmentioning

confidence: 99%

Section: Power Losses and Temperature Increasementioning

confidence: 99%

See 2 more Smart Citations

Coupled Electromagnetic and Thermal Analysis of Single-Phase Insulated High-Current Busducts and GIL Systems

Sarajčev¹,

Martinac²,

Radic³

2013

AJEEE

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“…This method has been already successfully applied to high voltage cables in [18,19] and to a high-current busduct of rectangular cross-section geometry in [12]. The method itself is well documented and explained in [12] and will not be repeated here.…”

Section: Figurementioning

confidence: 99%

Numerical Analysis of the Magnetic Field of High-Current Busducts and GIL Systems

Sarajčev

2011

Energies

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This paper presents a numerical computation method for determining the magnetic field of high-current busducts of circular cross-section geometry, based on the subdivision of the busduct phase conductors and screens into the conductor filaments and the subsequent application of the mesh-current method, with the aid of the geometric mean distance method. The mathematical model takes into account the skin effect and the proximity effects, as well as the complete electromagnetic coupling between phase conductors and metal enclosures (i.e., screens) of the single-phase isolated busduct system (of circular cross-section geometry). This model could be readily applied to the computation of the magnetic field of the Gas Insulated Transmission Lines (GIL) as well.

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Losses distribution in sheathed power cables under non‐sinusoidal currents using numerical method

Rasoulpoor

Mirzaie

Mirimani

2016

Comp Applic In Engineering

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This paper presents losses distribution in power cables conductors and metallic sheaths. Losses are computed in sinusoidal and non‐sinusoidal currents with considering all sequences harmonics. Two numerical methods as finite element and integral method are used to determine the distributions and also total harmonic losses. Thus skin and proximity effects of all metallic parts of cables are considered accurately. Integral method is utilized for losses calculation by considering of earth return path and eliminating it. Furthermore, IEC formulations are used for losses computations. Numerical results suggest inserting the earth return path effect on cable losses in some harmonic frequencies of currents. Power cables are assumed to be single core medium voltage type. Lead sheaths of cables are bonding together and grounded at both ends for calculation of circulating current losses. Also the effects of different distances between cables in losses calculations are assessed. For validation of integral method, finite element simulation, as proven method in accurate power cable losses computations is used. These methods are completely described in this paper. Accuracy of integral method for harmonic losses computations of conductor and sheaths is verified by finite element simulation results. Also it is shown that proximity and skin effects are considered very well by integral method even in metallic sheaths. © 2016 Wiley Periodicals, Inc. Comput Appl Eng Educ 24:692–705, 2016; View this article online at http://www.wileyonlinelibrary.com/journal/cae; DOI

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Nonlinear-Coupled Electric-Thermal Modeling of Underground Cable Systems

Cited by 35 publications

References 35 publications

Coupled Electromagnetic and Thermal Analysis of Single-Phase Insulated High-Current Busducts and GIL Systems

Coupled Electromagnetic and Thermal Analysis of Single-Phase Insulated High-Current Busducts and GIL Systems

Numerical Analysis of the Magnetic Field of High-Current Busducts and GIL Systems

Losses distribution in sheathed power cables under non‐sinusoidal currents using numerical method

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