Coupled Magnetic-Structural Modeling of Power Transformer for Axial Vibration Analysis Under Short-Circuit Condition

Jin, Mingkai; Chen, Weijiang; Zhao, Yi; Wen, Tao; Wu, Jie; Wu, Xingwang; Zhang, Qiaogen

doi:10.1109/tmag.2022.3175245

Cited by 20 publications

(16 citation statements)

References 26 publications

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“…Apart from that, the ability involves multiple physical fields, such as electromagnetics, mechanics, and fluids. Attention should be paid to spatial differences and time effects, but simplification is often required because of the resource and engineering calculation efficiency [18]. Much research must be implemented to balance high efficiency and high accuracy.…”

Section: Introductionmentioning

confidence: 99%

A dynamic relative displacement evaluation method for extra‐high voltage transformer withstanding short‐circuit impact

Luo

et al. 2023

IET Generation Trans & Dist

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The extra-high voltage (EHV) transformer winding disks are subjected to dynamic electromagnetic forces caused by short-circuit currents. These periodically decaying impact forces may endanger the safety of the transformer. The winding constraint conditions around the circumference are different due to the influence of axial pressure structures and magnetic boundaries. Moreover, this difference becomes more evident as the voltage and capacity increase. To investigate the spatial differences and time effects of EHV transformer shortcircuit faults, this paper proposes a reliability evaluation method based on dynamic relative displacement (DRDEM) for the first time. Firstly, the suitable and efficient analysis method is summarized by comparing the deviation among different calculated impedances and the measured value. Then, the space-time effect of windings is obtained by the static magnetic field and dynamic structural field based on equivalent compression supports. Furthermore, a 50 MVA/110 kV transformer is designed for the destructive short-circuit test to simulate the short-circuit ability feature of the EHV transformer. The disassembly phenomena after all the tests indicate that the DRDEM is more adaptable in characterizing the winding ability to withstand short circuit when investigating the spatial differences and time effects.

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Section: Introductionmentioning

confidence: 99%

A dynamic relative displacement evaluation method for extra‐high voltage transformer withstanding short‐circuit impact

Luo

et al. 2023

IET Generation Trans & Dist

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“…In earlier studies, analytical methods and empirical formulas were mainly used to analyze the short-circuit characteristics of power transformers. Later, the finite element model (FEM) provided a more convenient and effective method [5,6]. Yadav et al established a simulation model to study the magnetic field and short-circuit force when the fault occurs [7].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic and Mechanical Characteristics of Transformer under Multiple Short‐Circuit Impacts

Lin

Wang

et al. 2023

IEEJ Transactions Elec Engng

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The short-circuit withstand capability of the transformer is crucial to the reliability of power systems. Research on the shortcircuit characteristics of windings is the basis for improving the stability of power transformers. Although many studies focus on electromagnetic force and cumulative deformation of two-winding transformers, there is a lack of careful comparison of the electromagnetic and mechanical characteristics of three-winding transformers, as well as the cumulative effect of stress, displacement and strain. In this paper, the model is established to study temporal response and spatial distribution of the electromagnetic and mechanical properties under short-circuit impacts. The results show that the short-circuit effects on medium and low-voltage windings are more severe than on high-voltage windings. The first current peak will lead to the greatest threat. Second, the influences of iron core and pre-stress on short-circuit characteristics are investigated. The characteristics of windings differ between inside and outside the iron core window, which is pronounced for high-voltage winding. Besides, the greater pre-stress is not better for the stability of windings. Finally, it is found that the residual stress and displacement continue to accumulate and the plastic strain appears under multiple short-circuit impacts. This work is helpful for the analysis of short-circuit withstand capability of transformers.

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“…Through simulation analysis, the short -circuit power of single -phase short circuit and short -term short circuit was found, and the two short -circuit forces were basically the same [10] . Mingkai J proposed a magnetic-structural coupling model, which obtained the vibration process of strong coupling phenomenon by analyzing, and verified its accuracy through iteration methods [11] .…”

Section: Introductionmentioning

confidence: 99%

Dynamic response of oil-immersed power transformer under short-circuit condition

Zhang

Gao

2023

Third International Conference on Mechanical, Electronics, and Electrical and Automation Control (METMS 2023)

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Aiming at the sudden short circuit of three-phase power transformer, some structures of the transformer are reasonably simplified to establish a three-dimensional finite element field-circuit coupling model of the transformer, and the dynamic response of the transformer under three-phase symmetrical short circuit is analyzed by Maxwell transient electromagnetic field simulation. The short-circuit current of the transformer reaches its peak value at 0.0092s at the beginning of the simulation, that is, the inpact current is 14645.8 A, and the distribution of the axial and radial leakage magnetic fields is obtained. Based on this, the electromagnetic force of the winding during short-circuit is calculated.

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Coupled Magnetic-Structural Modeling of Power Transformer for Axial Vibration Analysis Under Short-Circuit Condition

Cited by 20 publications

References 26 publications

A dynamic relative displacement evaluation method for extra‐high voltage transformer withstanding short‐circuit impact

A dynamic relative displacement evaluation method for extra‐high voltage transformer withstanding short‐circuit impact

Electromagnetic and Mechanical Characteristics of Transformer under Multiple Short‐Circuit Impacts

Dynamic response of oil-immersed power transformer under short-circuit condition

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