Harmonic Norton equivalent for the magnetising branch of a transformer

Semlyen, A.; Acha, E.; Arrillaga, J.

doi:10.1049/ip-c.1987.0025

Cited by 23 publications

(19 citation statements)

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“…Figure 2 shows the saturation characteristic of the transformer with different saturation degrees. The details of the modeling approach can be found in [16].…”

Section: System Description and Modelingmentioning

confidence: 99%

“…The saturation characteristic of the transformer is modeled by two-term polynomial [16] parameters a, b, and q, which are found from the initial slope of the non-linear characteristic and one point of the curve at saturation region. Figure 2 shows the saturation characteristic of the transformer with different saturation degrees.…”

Section: System Description and Modelingmentioning

confidence: 99%

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Impact of Core Loss Non-linearity on Stability Domain of Ferroresonance

Moradi

Gholami

2010

Electric Power Components and Systems

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Iron losses strongly influence ferroresonance behavior of power transformers. While a jump-up is the characteristic of the non-linear magnetizing branch, the jump-down phenomenon can only be described when losses or loads are considered. In this article, the impact of core losses (constant resistance or non-linear resistancce) on the turning points of the bifurcation diagram of a ferroresonance circuit is investigated by a developed 2-D bifurcation diagram. The sensitivity of solutions with respect to the circuit parameters are analyzed and discussed. It is shown that the left-side turning point is more affected by the non-linear core loss model than the right side is. Based on the developed method, an operational guideline for the range of values of the load that avoids the jump between steady-state solutions and ferroresonance overvoltages with different source voltage amplitudes is provided. The results obtained by analytical approach are compared with time domain simulations.

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“…Figure 2 shows the saturation characteristic of the transformer with different saturation degrees. The details of the modeling approach can be found in [16].…”

Section: System Description and Modelingmentioning

confidence: 99%

Section: System Description and Modelingmentioning

confidence: 99%

Impact of Core Loss Non-linearity on Stability Domain of Ferroresonance

Moradi

Gholami

2010

Electric Power Components and Systems

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“…Therefore, there may not be a case where the inductive reactance is equal to the capacitive reactance, but yet very high and damaging overvoltages occur. In power system the ferroresonance occurs when a nonlinear inductor is fed from a series capacitor [1][2][3][4]. The nonlinear inductor in power system can be due to: a) The magnetic core of a wound type voltage transformer, b) Bank type transformer, c) The complex structure of a 3 limb three-phase power transformer (core type transformer), d) The complex structure of a 5 limb three-phase power transformer (shell-type transformer).…”

Section: Overview Of Ferroresonancementioning

confidence: 99%

“…Ferroresonance is a general term applied to a wide variety of interactions between capacitors and iron-core inductors that result in unusual voltages and/or currents [1][2][3][4][5]. In linear circuits, resonance occurs when the capacitive reactance equals the inductive reactance at the frequency at which the circuit is driven.…”

Section: Overview Of Ferroresonancementioning

confidence: 99%

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Ferroresonance Phenomenon in Power Transformers - Experimental Assessment

Abdallah¹,

El‐Kady²

2005

eng

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ABSTRACT. This paper reports on the results of recent research and development efforts to study and assess various impacts of ferroresonance phenomenon on operating performance of power transformers and to investigate ways to mitigate the effects of such phenomenon. Three-phase core-type transformers are used in the study. The results of the technical investigation and the associated ferroresonance experimental work performed showed that ferroresonance can cause dangerous overvoltages and overcurrents in three-phase coretype transformers. Sensitivity analysis results are also presented to determine the impact of various design and operating parameters on the resulting overvoltages and overcurrents caused by ferroresonance.

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Effect of power frequency excitation character on ferroresonance in neutral-grounded system

Hui¹,

Liu²

2010

Chinese Phys. B

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In most earlier ferroresonance studies the traditional excitation characteristic of iron core, in which the traditional excitation characteristic contains harmonic voltages or currents, has been used as if it were made up of pure fundamental voltage or current. However, this is not always true. In comparison with traditional excitation characteristics, this paper introduces the power frequency excitation characteristic of the iron core, which contains no harmonics. The power frequency excitation characteristic of iron core has been obtained by Elector Magnetic Transient Program, resulting in discrete voltage and current pairs. Extensive simulations are carried out to analyse the effect of power frequency excitation characteristic on potential transformer ferroresonance. A detailed analysis of simulation results demonstrates that with power frequency excitation characteristic of iron core inclusion at certain excitation voltage the ferroresonance may happen, conversely it may not happen with traditional excitation characteristic inclusion.

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Harmonic Norton equivalent for the magnetising branch of a transformer

Cited by 23 publications

References 0 publications

Impact of Core Loss Non-linearity on Stability Domain of Ferroresonance

Impact of Core Loss Non-linearity on Stability Domain of Ferroresonance

Ferroresonance Phenomenon in Power Transformers - Experimental Assessment

Effect of power frequency excitation character on ferroresonance in neutral-grounded system

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