Comparing the T and $\pi$ Equivalent Circuits for the Calculation of Transformer Inrush Currents

León, Francisco de; Farazmand, Ali; Joseph, Philumon

doi:10.1109/tpwrd.2012.2208229

Cited by 80 publications

(32 citation statements)

References 5 publications

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“…via use of magnetic circuits and the associated topological models [28]. Here, use of a PI-circuit representation for the 50/60 Hz model can be advantageous [29].…”

Section: E Core Representationsmentioning

confidence: 99%

Wideband Transformer Modeling Including Core Nonlinear Effects

Gustavsen

2016

IEEE Trans. Power Delivery

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“…via use of magnetic circuits and the associated topological models [28]. Here, use of a PI-circuit representation for the 50/60 Hz model can be advantageous [29].…”

Section: E Core Representationsmentioning

confidence: 99%

Wideband Transformer Modeling Including Core Nonlinear Effects

Gustavsen

2016

IEEE Trans. Power Delivery

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“…In this paper, the model is selected to represent the transformer [9]. Tests have been performed on four different transformers ( , , , and ) to obtain the parameters.…”

Section: Transformer Modelmentioning

confidence: 99%

“…In this paper, the inner -TABLE II AIR-CORE INDUCTANCES FOR THE FOUR TRANSFORMERS UNDER STUDY most winding is called the first winding, the one after is called second winding, and so forth. The open-circuit test is used to obtain the magnetizing parameters of the transformers as in [9]. The leakage parameters of the transformers are obtained accurately from the bucking test [10].…”

Section: Transformer Modelmentioning

confidence: 99%

“…Data given for transformer is for the innermost (first) winding. Hysteresis loops of the three transformers are obtained from Faraday's Law integrating the induced voltage to find the flux as in [9].…”

Section: Transformer Modelmentioning

confidence: 99%

“…3-D finite-element method (FEM) simulations (using the commercial program Maxwell 14) are carried out. The air-core inductance is calculated as follows [9], [11]:…”

Section: Transformer Modelmentioning

confidence: 99%

See 2 more Smart Citations

Analysis, Modeling, and Simulation of the Phase-Hop Condition in Transformers: The Largest Inrush Currents

Farazmand¹,

León²,

Zhang³

et al. 2014

IEEE Trans. Power Delivery

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Inrush currents in transformers can have very disruptive effects, such as voltage sags, false tripping of the protective devices, and mechanical stresses in the transformer windings. This paper shows that there are operating situations that may cause a transformer to draw abnormally high inrush currents. Examples include the normal operation of offline uninterruptible power-supply (UPS) systems, interruptions, voltage sags, and notching. These conditions may produce inrush-like currents of more than twice the value of the "normal" maximum inrush caused by energizing at voltage zero-crossing. For this condition, the term "phase-hop" is used in this paper. Laboratory experiments were performed on four different transformers (1 kVA) with varied characteristics and show the impact of phase-hop in the magnitude of inrush currents. The experiments are also used to validate the Electromagnetic Transients Program model used for the analysis of multiple cases. In addition, the behavior of the magnetic flux in a transformer under phase-hop is investigated and compared with different operating conditions using finite elements. The results of this paper have implications in transformer design and in the operation and design of UPS systems to prevent the damaging effects of phase-hop.

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Modelling of Power Components for Transients Studies

Martínez-Velasco¹

2019

Transient Analysis of Power Systems

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Comparing the T and $\pi$ Equivalent Circuits for the Calculation of Transformer Inrush Currents

Cited by 80 publications

References 5 publications

Wideband Transformer Modeling Including Core Nonlinear Effects

Wideband Transformer Modeling Including Core Nonlinear Effects

Analysis, Modeling, and Simulation of the Phase-Hop Condition in Transformers: The Largest Inrush Currents

Modelling of Power Components for Transients Studies

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