Simulation model of an air gapped current transformer

Muthumuni, Dharshana; McLaren, P.G.; Chandrasena, W.; Parker, A.D.

doi:10.1109/pesw.2001.916940

Cited by 13 publications

(8 citation statements)

References 4 publications

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“…An air gap in the CT core decreases the remnant magnetic flux and, consequently, K REM . Having a small gap, K REM ≈1 (Muthumuni et al , 2001). A decrease in K REM requires a decrease in the size of the CT. Another effect of having an air gap is that increases the phase error, which must be taken into account in the design (IEC60044‐6 (1992‐2003); Lesniewska and Jalmuzny, 2008).…”

Section: Magnetization Characteristicsmentioning

confidence: 99%

See 1 more Smart Citation

A novel PSO‐based technique for optimal design of protective current transformers

Rashtchi¹,

Bagheri²,

Shabani³

et al. 2011

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

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PurposeThe purpose of this paper is to present a new approach for the optimal design of protective current transformers (CTs). The proposed technique is applied to the design of typical CTs and results are compared with traditional CT design method and genetic algorithm optimization algorithm.Design/methodology/approachThe aim of CT design is to make current measurements more accurately, particularly for the high fault currents which arise in short circuits, and more efficient CT in terms of both size and cost. The present work formulates these objectives as an optimization problem to be solved by particle swarm optimization.FindingsSimulation results demonstrate the effectiveness of this technique in optimizing the CT design parameters. The designed CTs have smaller measurement errors compared to standard values and respond well to high fault currents. Manufacturing costs have also been reduced.Originality/valueIn addition to improved efficiency, the benefits of this method are its treatment of CT design in terms of an equivalent circuit and design parameters. The proposed algorithm also extends the linear operation area of the CT and guarantees its good response to high fault currents that may occur in power systems.

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Section: Magnetization Characteristicsmentioning

confidence: 99%

“…On the other hand, μ gap is the permeability of air, i.e. 4 π ×10 −7 (Muthumuni et al , 2001; Kang et al , 2008). As can be seen from Figure 5, the air gap widens the linear area of magnetization curve and avoids the CT from saturating for a larger range of short‐circuit currents.…”

Section: Magnetization Characteristicsmentioning

confidence: 99%

A novel PSO‐based technique for optimal design of protective current transformers

Rashtchi¹,

Bagheri²,

Shabani³

et al. 2011

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

View full text Add to dashboard Cite

show abstract

“…To date, several models have been proposed in the scientific literature to represent the performance of air‐gapped CTs . In Ref.…”

Section: Introductionmentioning

confidence: 99%

“…In Ref. , an air‐gapped CT model is presented based on the Jiles‐Atherton (J‐A) Theory. Although the proposed model can accurately simulate the excitation characteristics of CTs, the parameters such as regional coupling coefficient, thermal coefficient, regional flexibility, and direction coefficient, are basically difficult to be obtained and can only be approximated.…”

Section: Introductionmentioning

confidence: 99%

Design and simulation of a new model for air‐gapped current transformers

Dong

Mirsaeidi

2018

IEEJ Transactions Elec Engng

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Current transformers (CTs) with air gaps in their iron cores are mainly applied in power systems to prevent saturation-caused malfunctions of current-based relays. However, performing reliable power system studies necessitates accurate modeling of airgapped CTs. This paper presents a new model for air-gapped CTs based on the Preisach Theory, which has the ability to represent the role of air gaps of different lengths in the performance of a CT. The salient feature of this study in comparison with other published works is that it does not require measuring the magnetization curves of the air-gapped core, which is often difficult. In order to validate the effectiveness of the proposed method, several simulations have been performed using PSCAD/EMTDC and MATLAB software packages. Simulation results indicate that the proposed model can accurately represent the characteristics of saturation as well as remanence of air-gapped CTs.

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“…This model can simulate the saturation characteristics of air-gapped CT, but the simulation of the core is not accurate enough. In [3], the air-gapped CT model is established based on Jiles-Atherton (JA) Theory. This model can accurately simulate the effect of air gap on the magnetization process.…”

Section: Introductionmentioning

confidence: 99%

Modeling and simulation of air-gapped current transformer based on Preisach Theory

Dong

Mirsaeidi

2017

Prot Control Mod Power Syst

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Current Transformer (CT) modeling, by which CT's characteristics can be studied has a significant importance in CT selection and design. In spite of numerous studies about closed-core CT model, only a few works have been conducted on air-gapped ones with the following problems: models of which required data is easily-accessible, have poor simulations of magnetization process; on the contrary, models which have satisfactory simulations, are hard to be established because of the hard-to-get required data. Therefore, based on Preisach Theory, a novel air-gapped CT model is deduced from the closed core CT model. The proposed model is accurate and can be established easily. The saturation and remanence properties of closed-core CT and air-gapped CT are simulated and compared.

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Simulation model of an air gapped current transformer

Cited by 13 publications

References 4 publications

A novel PSO‐based technique for optimal design of protective current transformers

A novel PSO‐based technique for optimal design of protective current transformers

Design and simulation of a new model for air‐gapped current transformers

Modeling and simulation of air-gapped current transformer based on Preisach Theory

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