Electromagnetic analysis of a superconducting transformer for high current characterization of cable in conduit conductors in background magnetic field

Wu, Xiaobo; Tan, Yunfei; Fang, Zhen; Jiang, Donghui; Chen, Zhiyou; Chen, Wenge; Kuang, Guangli

doi:10.1016/j.cryogenics.2017.08.012

Cited by 4 publications

(6 citation statements)

References 15 publications

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“…The values of leakage reactances of primary and secondary windings determined for higher harmonics of distorted current or higher frequency sinusoidal current are equal to values determined for the sinusoidal signal of frequency 50 Hz presented in Tables 1 and 2. Analysis of obtained results and dependences for leakage inductance presented in [10][11][12][13] allow to formulate the relationship:…”

Section: Object Of the Research And Applied Methodology Of The Laboramentioning

confidence: 99%

“…Then the direct measuring system must contain a programmable power supply, which enables adjustment of the rms value of harmonics in its output voltage and a high current testing transformer [8,9]. With modern superconducting transformers, it is possible to generate currents of high rms values [10]. These constructions are characterised by high efficiency, due to the absence of the magnetic core and negligible windings losses.…”

Section: Essence Of the Problem And State-of-the-artmentioning

confidence: 99%

“…The rms values of harmonic of the voltages U ″ w1hk i U w2hk are determined from (9) and (10). The rms value of distorted primary voltage may not exceed the maximum permissible value resulting from the level of dielectric insulation provided by an enamel coating of a copper wire used to make primary winding of a high current testing transformer.…”

Section: Required Properties Of the High Current Testing Transformer mentioning

confidence: 99%

\frac{L_{w C 2}}{L_{w C 1}} = {()(, \frac{n_{C 2}}{n_{C 1}})}^{2} \frac{R_{C 1}}{R_{C 2}}

L wC 1 \ L wC 2 – leakage reactance of winding in the configuration of sections 1 or 2, n C 1 \ n C 2 – resultant number of turns of a winding in the configuration of sections 1 or 2, R C 1 \ R C 2 – equivalent resistance of winding in the configuration of sections 1 or 2.…”

Section: Determined Parameters Of the Equivalent Circuit Of The Higmentioning

confidence: 99%

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Application of the inductive high current testing transformer for supplying of the measuring circuit with distorted current

Kaczmarek

Stano

2019

IET Electric Power Applications

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The increasing number of non-linear loads and renewable energy sources causes a decrease in the power quality in the power networks. Therefore, tests of current transformers should be performed in similar conditions. This requires generation by a high current testing transformer of distorted currents that rms values are from a few hundred to several thousands of amperes with a given harmonics levels. However, its frequency band of operation is limited by inductances of its windings and connected load that result from the length and parameters of the used current track and connected device under test. To ensure the constant rms value of higher harmonic of distorted secondary current with the increase of its frequency proportional increase of the rms value of this harmonic in distorted primary voltage of the high current testing transformer is required. However, the maximum permissible value of primary voltage is limited by the dielectric strength of insulation of the primary winding. The purpose of presented studies is to determine the factors that condition the frequency band of operation of a high current testing transformer and limits the range of higher harmonics while testing of the transformation accuracy of instrument current transformers for distorted currents.

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Section: Object Of the Research And Applied Methodology Of The Laboramentioning

confidence: 99%

Section: Essence Of the Problem And State-of-the-artmentioning

confidence: 99%

Section: Required Properties Of the High Current Testing Transformer mentioning

confidence: 99%

\frac{L_{w C 2}}{L_{w C 1}} = {()(, \frac{n_{C 2}}{n_{C 1}})}^{2} \frac{R_{C 1}}{R_{C 2}}

Section: Determined Parameters Of the Equivalent Circuit Of The Higmentioning

confidence: 99%

See 2 more Smart Citations

Application of the inductive high current testing transformer for supplying of the measuring circuit with distorted current

Kaczmarek

Stano

2019

IET Electric Power Applications

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“…[2] apply non-linear loads such as recti􀅫iers, electronic phase control, and PWM drives, giving rise to a vastly increased level of harmonics in the power network, simulation magnetic 􀅫lux density (T) distribution result. [3] To satisfy the test requirements of the superconducting cables, a large CICC test facility has been developed at the High Magnetic Field, and the samples are. For our test facility, the samples are spiral structures and are tested in the solenoidal magnet system, a transformer of experiment with large size, but it was designed for very high current (kA), simulation by ANSYS, and design by using the vertical coil.…”

Section: Literature Reviewmentioning

confidence: 99%

Design and application of unloaded flat transformers with spiral coils

Yen¹,

Lin²,

Lin³

et al. 2022

J. adv. tec. eng. res.

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The proposed transformer was designed with 􀅫lexible spirals, similar to the Archimedes spiral design, to achieve a thin transformer structure. Soft layered magnetic materials were produced by stacking two or more sets of spiral coils on a plane at a short distance from each other and using suitable spacer materials between these coil sets. Accordingly, an innovative, thin, 􀅫lat, and 􀅫lexible transformer was created, and its functionality was ensured. The speci􀅫ications of the spiral coils were as follows: wire diameter = 20 mil, the gap between turns = 20 mil, number of turns = 40, and thickness = 1 OZ. The transformer was designed with a one-layer or two-layer structure for conducting experiments. Coils were stacked directly to change the coil ratio of the transformer. The substrate material was polyimide, which is 􀅫lexible and can generate a sound when interacting with magnets. The performance of the developed transformer was examined under two coil ratios: 1:1 and 1:2. Different magnetic materials were used between the coil sets to examine the effects of these materials on the transformer performance. Five settings (A-E) were adopted in this study, and the optimal experimental results were obtained in Setting E, and the second-best results were obtained in Setting C. A silicon steel/primary coil/secondary coil/silicon steel structure was used in Setting E. The output voltage and current were 0.22 V and 12.6 mA, respectively, at a coil ratio of 1:1, as well as 0.49 V and 8.7 mA, respectively, at a coil ratio of 1:2. In Setting C, a magnet/primary coil/secondary coil/magnet structure was used, and the output voltage and current were 0.20 V and 9.27 mA, respectively, at a coil ratio of 1:1 as well as 0.46 V and 7.45 mA, respectively, at a coil ratio of 1:2. The experimental results revealed that the performance of a 􀅫lat transformer is mainly affected by the spacing between the primary and secondary coils and not by the magnetic material between two coil sets. The secondary coils generate the maximum voltage and current when the primary and secondary coils tightly 􀅫it together without any spacer material.

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Heat transfer analysis of three phase transformer considering unpredictable load demand changes

Afandi¹,

Aripriharta²,

Rahmawati³

et al. 2020

AIP Conference Proceedings

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Electromagnetic analysis of a superconducting transformer for high current characterization of cable in conduit conductors in background magnetic field

Cited by 4 publications

References 15 publications

Application of the inductive high current testing transformer for supplying of the measuring circuit with distorted current

Application of the inductive high current testing transformer for supplying of the measuring circuit with distorted current

Design and application of unloaded flat transformers with spiral coils

Heat transfer analysis of three phase transformer considering unpredictable load demand changes

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