Three dimensional finite element modeling of a current transformer and analyzing its operation under normal condition

Givi, Hadi; Moghani, Javad Shokrollahi; Vakilian, Z. M. A.; Noroozi, Mohammad Ali

doi:10.1109/iraniancee.2013.6599715

Cited by 3 publications

(5 citation statements)

References 4 publications

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“…Equation (15) shows that the imaginary part of the interfering flux is bilaterally symmetric. Based on this symmetry, a multi-segment testing coil configuration is designed, as presented in Fig.4.…”

Section: Two-segment Testing Coil Configurationmentioning

confidence: 99%

“…To make the coil leakage flux equivalent to the real interfering flux, equation (19) should be close to (15). Since the first few Fourier series play the dominant role in both equations, the aim of the design will be to make the first few series in the equations equal to each other.…”

Section: Two-segment Testing Coil Configurationmentioning

confidence: 99%

“…Previous works are mostly based on finite-element analysis (FEA) or experiments [4][5]15], which are accurate enough, but not efficient enough for such optimization-oriented analysis. In [11], an equivalent circuit method is used to determine the parameters of the testing coils, but the highly-simplified model is insufficient to certify a full-range magnetic equivalence in the core.…”

Section: Introductionmentioning

confidence: 99%

“…Note that in real situations, bus-bars have finite length with turnings or cascading assemblies at the end of the conductors, which will lead to an extra interfering field similar to those produced by adjacent bus-bars [3,15]. This paper only deals with the cases where the turning of bus-bars are relatively far away from HCT, so that the effect of turning can be neglected.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Design of equivalent coils for anti- interference testing of heavy current transformers

Gao

Zhao

Qu³

et al. 2018

JAE

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Section: Two-segment Testing Coil Configurationmentioning

confidence: 99%

Section: Two-segment Testing Coil Configurationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of equivalent coils for anti- interference testing of heavy current transformers

Gao

Zhao

Qu³

et al. 2018

JAE

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“…However, so far, quantified studies on the performance of shielding coils are limited in number and scope. Due to the lack of analytical models, existing studies on the stray flux and the leakage flux of shielding coils are mainly based on physical experiments [ 1 , 4 , 10 , 13 , 14 , 15 ] or numerical calculations [ 9 , 11 , 13 , 14 , 16 , 17 , 18 ], both of which take a lot of time to process [ 19 ]. This problem is especially pronounced in the optimization of shielding coils, where thousands of cases are to be inspected [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Modelling and Optimization of Four-Segment Shielding Coils of Current Transformers

Gao

Zhao

Wang

et al. 2017

Sensors

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Applying shielding coils is a practical way to protect current transformers (CTs) for large-capacity generators from the intensive magnetic interference produced by adjacent bus-bars. The aim of this study is to build a simple analytical model for the shielding coils, from which the optimization of the shielding coils can be calculated effectively. Based on an existing stray flux model, a new analytical model for the leakage flux of partial coils is presented, and finite element method-based simulations are carried out to develop empirical equations for the core-pickup factors of the models. Using the flux models, a model of the common four-segment shielding coils is derived. Furthermore, a theoretical analysis is carried out on the optimal performance of the four-segment shielding coils in a typical six-bus-bars scenario. It turns out that the “all parallel” shielding coils with a 45° starting position have the best shielding performance, whereas the “separated loop” shielding coils with a 0° starting position feature the lowest heating value. Physical experiments were performed, which verified all the models and the conclusions proposed in the paper. In addition, for shielding coils with other than the four-segment configuration, the analysis process will generally be the same.

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CT eccentricity error evaluation model based on the actual magnetization curve

Zhang

Huang

Xiao

et al. 2018

2018 International Applied Computational Electromagnetics Society Symposium (ACES)

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Three dimensional finite element modeling of a current transformer and analyzing its operation under normal condition

Cited by 3 publications

References 4 publications

Design of equivalent coils for anti- interference testing of heavy current transformers

Design of equivalent coils for anti- interference testing of heavy current transformers

Modelling and Optimization of Four-Segment Shielding Coils of Current Transformers

CT eccentricity error evaluation model based on the actual magnetization curve

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