Investigation of Transformer Electromagnetic Forces Caused by External Faults Using FEM

Azevedo, Antônio Carlos de; Rezende, I.; Delaiba, Antônio Carlos; Oliveira, José Carlos de; Carvalho, Bismarck Castillo; Bronzeado, H.S.

doi:10.1109/tdcla.2006.311522

Cited by 18 publications

(8 citation statements)

References 2 publications

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“…It was generated by the integration of the instantaneous ampere-turn (NI) in each of windings as well as the leakage flux derived as (5). The 𝐹 𝑎 was calculated based on the residual ampere-turns method [44]. It is the relationship between the radial flux density (Br), the average of ampere-turns at the total length of winding and the effective length of radial flux path (ℎ 𝑒𝑓𝑓 ).…”

Section: The Axial and Radial Forces Based On Analytical Methodsmentioning

confidence: 99%

Electromagnetic force distribution computations due to switching surge in disc-type winding

Yasid

Azis

Yousof

et al. 2023

IJEECS

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This manuscript discusses the computation of electromagnetic forces on a disc-type winding due to a standard switching impulse (SSI). First, the resistances, inductances and capacitances (RLC) of a 30 MVA, 33/11 kV disc-type distribution transformer were estimated to obtain the winding equivalent circuit. The transient voltage waveforms for each of the disc layers and corresponding resonances of the windings under the SSI were then obtained in time domains. Next, the axial and radial force distributions in the disc winding due to the SSI were computed. The forces on each disc layer and along the disc windings due to the SSI were computed based on the analytical and numerical methods via the finite element method (FEM) respectively. The non-uniform switching impulse voltage distribution results in non-uniform force distribution along the disc winding. The magnitude of the axially directed force on the disc winding is found to be higher as compared to the radially directed force.

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Section: The Axial and Radial Forces Based On Analytical Methodsmentioning

confidence: 99%

Electromagnetic force distribution computations due to switching surge in disc-type winding

Yasid

Azis

Yousof

et al. 2023

IJEECS

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“…The radial force in (5-1) will create tensile stress on the outer winding of the coil and compressive stress on the inner winding. Typical failures occur at the maximum tensile stress of the coil [40], as described by .…”

Section: A High Voltage Modelmentioning

confidence: 99%

“…"#$ is the cross-sectional area of the wire. The axial forces are generated as a result of the radial flux interaction caused by the current passing through the coil [40]. The mean axial force is given by .…”

Section: A High Voltage Modelmentioning

confidence: 99%

A neodymium hybrid fault current limiter

Prigmore

Mendoza

Karady

2014

Int. Trans. Electr. Energ. Syst.

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This dissertation presents a new hybrid fault current limiter (FCL) topology that is primarily intended to protect single-phase power equipment. It can however be extended to protect three phase systems but would need three devices to protect each individual phase. In comparison against the existing fault current limiter technology, the salient features of the proposed topology are: a) provides variable impedance that provides a 50% reduction in prospective fault current; b) near instantaneous response time which is within the first half cycle (1-4 ms); c) the use of semiconductor switches as the commutating switch which produces reduced leakage current, reduced losses, improved reliability, and a faster switch time (ns-µs); d) zero losses in steady-state operation; e) use of a Neodymium (NdFeB) permanent magnet as the limiting impedance which reduces size, cost, weight, eliminates DC biasing and cooling costs; f) use of Pulse Width Modulation (PWM) to control the magnitude of the fault current to a user's desired level. g) experimental test system is developed and tested to prove the concepts of the proposed FCL.This dissertation presents the proposed topology and its working principle backed up with numerical verifications, simulation results, and hardware implementation results. Conclusions and future work are also presented.ii DEDICATION

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“…Nowadays, amorphous transformers have been widely utilized in power systems due to noload losses being less than those of silicon steel core transformers by a rate of 60%-70% [1][2][3][4]. This leads to the reduction of total losses of the power system.…”

Section: Introductionmentioning

confidence: 99%

Computation of electromagnetic forces in the windings of amorphous core transformers

2024

Archives of Electrical Engineering

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Electromagnetic forces generated by the short circuit current and leakage flux in low-and high-voltage windings of distribution transformers as well as amorphous core transformers will cause the translation, destruction, and explosion of the windings. Thus, the investigation of these forces plays a significant role for researchers and manufacturers. Many authors have recently used the finite element method to analyze electromagnetic forces. In this paper, an analytic model is first developed for magnetic vector potential formulations to compute the electromagnetic forces (i.e., axial and radial forces) acting on the low-and high-voltage windings of an amorphous core transformer. The finite element technique is then presented to validate the results obtained from the analytical model. The developed model is applied to an actual problem.

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Investigation of Transformer Electromagnetic Forces Caused by External Faults Using FEM

Cited by 18 publications

References 2 publications

Electromagnetic force distribution computations due to switching surge in disc-type winding

Electromagnetic force distribution computations due to switching surge in disc-type winding

A neodymium hybrid fault current limiter

Computation of electromagnetic forces in the windings of amorphous core transformers

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