Transformer Magnetizing Inrush Current

Specht, T. R.

doi:10.1109/t-aiee.1951.5060409

Cited by 43 publications

(10 citation statements)

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“…(2) Accuracy of the Sequence Impedance method depends on the choice of equivalent parameters. It gives an iterative solution from a single program.…”

Section: Analysis With Mutual Coupling Methodsmentioning

confidence: 99%

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Digital Simulation of Magnetizing Inrush Currents in Three-Prase Transformers

Rahman

Gangopadhyay²

1986

IEEE Trans. Power Delivery

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An accurate simulation of magnetizing inrush currents is an important prerequisite for digital protection of power transformers.Generalized analytical expressions have been developed to simulate three-phase inrush currents based on sequence impedance and mutual coupling methods. The digitally simulated waveforms are compared with those obtained experimentally in a laboratory model transformer.There exists a reasonably close agreement between the computed and measured values.

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“…(2) Accuracy of the Sequence Impedance method depends on the choice of equivalent parameters. It gives an iterative solution from a single program.…”

Section: Analysis With Mutual Coupling Methodsmentioning

confidence: 99%

“…Numerous research were carried out since early 1940's [1][2][3][4][5][6][7] to derive their mathematical f ormulations and explain these phenomena.…”

Section: Introductionmentioning

confidence: 99%

Digital Simulation of Magnetizing Inrush Currents in Three-Prase Transformers

Rahman

Gangopadhyay²

1986

IEEE Trans. Power Delivery

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“…The common technique utilized to prevent mal‐operations of the differential protection during the energization of a power transformer is the level of harmonic components. The magnetizing inrush current includes high levels of the second harmonic component, which is used as a discriminative feature in conventional protective schemes .…”

Section: Introductionmentioning

confidence: 99%

A new model to study ultra-saturation phenomenon during the energization of a loaded three-phase power transformer and its effects on differential protection

Noshad

Tabatabaee

Ghanavati

et al. 2015

Int. Trans. Electr. Energ. Syst.

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Summary The ultra‐saturation phenomenon is one of the mal‐operations of the power transformer differential protection that may occur during the energization of a loaded power transformer. This paper presents a new model for investigating the ultra‐saturation phenomenon during the energization of a loaded three‐phase power transformer and considers its effects on the differential protection of the power transformer. To model the ultra‐saturation phenomenon, the nonlinear characteristic of the transformer core and the saturation effect of current transformers are taken into account. It is assumed that the load of the power transformer is a resistive and inductive load. The mal‐operation of the differential protection depends on a variety of factors, the most important of which are residual flux and inception angle. In this paper, the parameters mentioned will be studied in various scenarios. To verify the results of the proposed model, the ultra‐saturation phenomenon in an IEEE 14‐bus test system is also investigated. In this paper, simulation is performed by the programs PSCAD and MATLAB. Copyright © 2015 John Wiley & Sons, Ltd.

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“…The common technique utilized to prevent mal-operation of the differential protection during the energization of a power transformer is the level of harmonic components. The magnetizing inrush current includes high levels of the second harmonic component, which is used as a discriminative feature in conventional protective schemes [1,2].…”

mentioning

confidence: 99%