Remanent flux in current-transformer cores

Bruce, Ruth; Wright, A.

doi:10.1049/piee.1966.0152

Cited by 16 publications

(4 citation statements)

References 3 publications

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“…When a small excitation is energizing the transformer, a path corresponding to the initial residual flux will be traced out (see Figure 3b). The residual flux will trace back to the initial status when de-energizing [23]. Based on the inherent hysteresis characteristic of the magnetic material, a small AC signal can be chosen to measure the magnetizing inductance with little effects on the residual flux.…”

Section: Domain Wall Displacementmentioning

confidence: 99%

Novel Remanence Determination for Power Transformers Based on Magnetizing Inductance Measurements

Chen

Yang

et al. 2019

Energies

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The remanence (residual flux) in the core of power transformers needs to be determined in advance to eliminate the inrush current during the process of re-energization. In this paper, a novel method is proposed to determine the residual flux based on the relationship between residual flux and the measured magnetizing inductance. The paper shows physical, numerical, and analytical explanations on the phenomenon that the magnetizing inductance decreases with the increase of residual flux under low excitation. Numerical simulations are performed by EMTP (Electro-Magnetic Transient Program) on a 1 kVA power transformer under different amounts of residual flux. The inductance–remanence curves are nearly the same when testing current changes. Laboratory experiments conducted on the same transformer are in line with the numerical simulations. Furthermore, numerical simulation results on a 240 MVA are reported to demonstrate the effectiveness of the proposed method.

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Section: Domain Wall Displacementmentioning

confidence: 99%

Novel Remanence Determination for Power Transformers Based on Magnetizing Inductance Measurements

Chen

Yang

et al. 2019

Energies

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“…Kern gesättigt werden und der Scheitelwert der Sekundärspannung beträchtlich über das ]/ 2-fache des Effektivwertes hinausgehen. Über die Höhe der vorübergehenden und dauernden Änderungen wird in [24] berichtet. Ein remanenter Fluß, der nach Abschaltung eines großen Stromes im Kern verbleiben kann, beeinflußt die Fehlerkurven.…”

Section: Theorie Und Berechnungunclassified

Stromwandler

WOELKEN¹

1968

tm - Technisches Messen

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“…In this study we report the effects of detergent (dodecylbenzene sulphonate) on growth and methanogenesis by M. barkeri strain MS. Although previous work has demonstrated the effects of synthetic detergents on the anaerobic digestion process [2][3][4][5][6], it is the terminal methanogenic phase which is often rate determining [7] and hence of most significance regarding sensitivity to inhibition.…”

Section: Introductionmentioning

confidence: 99%

The effect of detergent on methanogenesis by Methanosarcina barkeri

Khalil¹,

Whitmore²,

Gamel-El-Din³

et al. 1989

FEMS Microbiology Letters

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both growth and methanogenesis of Methanosarcina barkeri are completely inhibited by sodium dodecylbenzene sulphonate at between 15 and 20 mg·1−1. At lower concentrations growth of cultures was delayed, but no uncoupling of methanogenesis from growth was observed. Higher concentrations of detergent (50 mg·1−1) produced marked alterations in the surface structures of organisms observed in scanning electron micrographs. Thus levels of a detergent common in anaerobic sewage treatment plants can inhibit methanogenesis, the terminal stage in the anaerobic digestion process.

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Remanent flux in current-transformer cores

Cited by 16 publications

References 3 publications

Novel Remanence Determination for Power Transformers Based on Magnetizing Inductance Measurements

Novel Remanence Determination for Power Transformers Based on Magnetizing Inductance Measurements

Stromwandler

The effect of detergent on methanogenesis by Methanosarcina barkeri

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