Hybrid Analytical-FEM Approach for Power Transformer Transient Analysis

Jurišić, Bruno; Jurković, Zvonimir; Župan, Tomislav; Marković, Mladen

doi:10.37798/2024731512

Cited by 1 publication

(1 citation statement)

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“…There is a long list of harmful events and factors occurring in the power system that might affect this critical component. Transformer transient states occurring due to lightning and switching as well as other disturbances such as short circuits, no-load connections or ferroresonance phenomena always lead to overvoltages or overcurrents [3][4][5]. Since overvoltages and overcurrents are inevitable in transformer operation, two issues must be taken into account.…”

Section: Introductionmentioning

confidence: 99%

Practical Experiments with a Ready-Made Strategy for Energizing a Suitable Pre-Magnetized Three-Column Three-Phase Dy Transformer in Unloaded State for Inrush Current Computations

Łukaniszyn,

Majka,

Baron

et al. 2024

Energies

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This article presents the results of an experimental verification of three-phase Dy transformer dynamics under no-load conditions. This study is motivated by previous ferroresonance analyses where the occurrence of inrush currents has been observed. The measurements covered all available electrical quantities in a transient state (12 measured and 3 additionally computed waveforms) during the device’s start-up under no-load conditions, as well as in a long-term steady state. A detailed analytical analysis is carried out for the obtained comprehensive set of measurement results. As a result of the conducted research, the mathematical model of the pre-magnetized three-phase Dy transformer is modified. Particular attention is paid to the issue of residual magnetism of the transformer core and its consideration in further research. The original strategy for energizing a three-column three-phase Dy transformer with a suitable pre-magnetization of its columns and original control switching system with a given/set value of the initial phase in the supply voltage is put to the test. The evolution of the induced inrush phenomenon up to the quasi-steady state under given (forced) conditions is documented (currents, voltages and the dynamics of changes taking place in the core (hysteresis loops)). This article represents a continuation of ongoing work on the study of transient states (dynamics of transformer inrush currents). At present, the Dy three-phase transformer is analyzed because of the requirements of industrial operators.

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Section: Introductionmentioning

confidence: 99%