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

Sarajčev, Petar

doi:10.3390/en4122196

Cited by 15 publications

(22 citation statements)

References 10 publications

(21 reference statements)

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“…Moreover, governing equations are formulated using the additional assumptions: elbows (if exist) of the busduct or GIL system are neglected and the transmission line is longitudinally homogenous. Following assumptions are additionally introduced [12,18]: i) the current flows only longitudinally in the filament; ii) the material conductivity and permeability are uniform within each filament and independent of current (but may differ from those of other filaments); iii) material conductivity is temperature dependent and iv) all filaments are parallel. By this approach, the skin and proximity effects are directly incorporated within the presented method.…”

Section: Current Distributionmentioning

confidence: 99%

“…The system of equations given by (3), in case of the busduct or GIL system shields being grounded on both ends and mutually bonded, could be transformed into the following [18]: …”

Section: Current Distributionmentioning

confidence: 99%

“…The matrix of self and mutual impedances of the filament loops in Equation (4) consists of several submatrices; their description is as follows [18]:…”

Section: Current Distributionmentioning

confidence: 99%

“…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%

See 4 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%

“…The system of equations given by (3), in case of the busduct or GIL system shields being grounded on both ends and mutually bonded, could be transformed into the following [18]: …”

Section: Current Distributionmentioning

confidence: 99%

“…The matrix of self and mutual impedances of the filament loops in Equation (4) consists of several submatrices; their description is as follows [18]:…”

Section: Current Distributionmentioning

confidence: 99%

Section: Current Distributionmentioning

confidence: 99%

Section: Current Distributionmentioning

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

Self Cite

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Analysis of Electromagnetic Influences Concerning Two Adjacent Parallel High-current Bus Ducts

Sarajčev

2012

Electric Power Components and Systems

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Due to the medium-voltage level of generator terminals and very high current output, generator connection to the step-up transformer is often accomplished by means of high-current air-insulated bus duct systems. These high currents during normal generator operation produce accompanying power losses, which could result in excessive heating of the bus duct system. Additionally, the associated electromagnetic fields could have adverse effects on the performance of the neighboring equipment. Problems are further exacerbated by the fact that there are often two parallel adjacent systems, often equal in cross-sectional geometry, which interact through the electromagnetic coupling. The starting point for the analysis of the aforementioned problems involves a determination of current distribution in phase conductors and in the shields of the metal-enclosed bus duct systems. This article presents a computation model for the mentioned analysis, which is based on the mesh-current method, with the application of the geometric mean distance method in combination with the conductor filament method. It takes into account both skin effect and proximity effects, as well as the complete electromagnetic coupling between phase conductors and metal enclosures of two mutually parallel and adjacent high-current bus duct systems having equal cross-sectional geometry.

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Recent progresses in bus-ducts design

Faiz

Ehya

Takbash

et al. 2016

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose – Electrical energy distribution systems must be low losses systems in order to enhance the system efficiency. Therefore, it is preferred to distribute electrical energy by bus-ducts in the place of cables over all energy levels and decrease the losses. The purpose of this paper is to focus on a comprehensive survey of various aspects of bus-ducts design including electromagnetic, mechanical and thermal. Advantages and disadvantages of different available design techniques are reviewed. Design/methodology/approach – Different works on various bus-based power transmission and distribution systems are reviewed. Generally these are done in three categories including systems modeling methods, heat transfer in the systems, short circuit and electromagnetic force. The attempt is made to provide geometrical and materials specifications in order to present the analyzed system well. Findings – Different types of bus-ducts from used materials, voltage level and insulation types are reviewed. Bus-duct modeling techniques are introduced which can be easily applied for bus-ducts design. Electromagnetic field distribution, thermal pattern inside and outside of the bus-duct in normal and short circuit modes and finally mechanical considerations are dominant factors which must be taken into account in the bus-ducts design. This leads to an optimal design of bus-ducts which prolong the life span of the bus-ducts fixed in the installations. Originality/value – This paper for the first time systematically reviews the latest state of arts in the design of bus-ducts for efficient electrical energy distribution. It summarizes a variety of design techniques applicable to bus-ducts design.

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

Cited by 15 publications

References 10 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

Analysis of Electromagnetic Influences Concerning Two Adjacent Parallel High-current Bus Ducts

Recent progresses in bus-ducts design

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