Analysis on eccentric bus-bar testing method of heavy current transformer

Jin, Xing; Zhao, Wei; Huang, Songling; Jiang, Bo

doi:10.1109/i2mtc.2012.6229436

Cited by 2 publications

(3 citation statements)

References 6 publications

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“…Furthermore, in [ 16 ], the leakage flux produced by an eccentric primary bus-bar is also derived from the vector potential method, as shown in Equation (4).

where d is the eccentric distance of the bus-bar, i 1 is the bus-bar current, and k e is the core-pickup factor for the leakage flux produced by the eccentric bus-bar, which has been estimated to be almost the same as k s by simulation and experimental results demonstrated in previous publications [ 15 , 17 ].…”

Section: Analytical Models Of the Stray Flux And Coil Leakage Fluxmentioning

confidence: 97%

“…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%

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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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“…Furthermore, in [ 16 ], the leakage flux produced by an eccentric primary bus-bar is also derived from the vector potential method, as shown in Equation (4).

Section: Analytical Models Of the Stray Flux And Coil Leakage Fluxmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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

Gao

Zhao

Wang

et al. 2017

Sensors

Self Cite

View full text Add to dashboard Cite

show abstract

“…In [11], a method is proposed to simplify the multi-phase interference into a stray field produced by a single large current, but still a large current source as well as bulky bus-bars are required in the testing [12][13][14]. On the other hand, the principle of shielding coils can also be applied, i.e., introducing a set of partial testing coils to generate an equivalent interfering magnetic field.…”

Section: Introductionmentioning

confidence: 99%