The Calculation and Measurement of Axial Electromagnetic Forces on Concentric Coils in Transformers

Beavers, M. F.; Adams, C. M.

doi:10.1109/aieepas.1959.4500357

Cited by 7 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These forces oscillate at double of the circuit frequency [22,23]. The crushing forces within the coil might be huge, however the forces exerted on the coil clamps may be zero [14] leading to the compression of some parts of the winding whereas other parts of the same winding is in tension. At the winding terminals the leakage field try to spread out and form a radial component that produces an axial force along the winding as shown in Figure 3.…”

Section: Transformer Equivalent Circuit Parameters Calculationmentioning

confidence: 99%

“…(c) The electrical parameters matrices are extracted for normal and faulty conditions and the percentage change in each parameter due to axial displacement is calculated as: Percentage change in parameter x = 100% (14) where x n and x f are respectively the parameter (inductance or capacitance) values during normal and faulty conditions. Figure 6 shows the percentage change of the mutual inductance between HV and LV windings with respect to the base value of healthy condition for different axial displacement fault levels when it takes place within the HV and LV windings.…”

Section: Impact Of Axial Displacment On Equivalent Electric Circuit Pmentioning

confidence: 99%

“…FRA relies on graphical analysis and so far, there is no reliable code for FRA signatures classification and quantification. There have been many attempts in the literature to understand the impact of various mechanical faults on the FRA signature [11][12][13][14][15]. All of these studies have been performed on a high frequency transformer equivalent circuit model or by using the equivalent transfer function through altering the value of particular parameters to simulate various mechanical faults [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Improved power transformer winding fault detection using FRA diagnostics – part 1: axial displacement simulation

Hashemnia

Abu-Siada

Islam

2015

IEEE Trans. Dielect. Electr. Insul.

131

View full text Add to dashboard Cite

Frequency response analysis (FRA) has become a widely accepted tool to detect power transformer winding deformation due to the development of FRA test equipment. Because FRA relies on graphical analysis, interpretation of its signature is a very specialized area that calls for skilled personnel, as so far, there is no reliable standard code for FRA signature identification and quantification. Many researchers investigated the impact of various mechanical winding deformations on the transformer FRA signature using simulation analysis by altering particular electrical parameters of the transformer equivalent electrical circuit. None of them however, investigated the impact of various physical fault levels on the corresponding change in the equivalent circuit parameters. In this paper, the physical geometrical dimension of a single-phase transformer is simulated using 3D finite element analysis to emulate the real transformer operation. A physical axial displacement of different fault levels is simulated in both low voltage and high voltage windings. The impact of each fault level on the electrical parameters of the equivalent circuit is investigated. A key contribution of this paper is the charts it introduces to correlate various axial displacement levels with the percentage change of all transformer equivalent circuit parameters due to the axial displacement fault. In contrary with other researchers who only considered mutual inductance between low voltage and high voltage windings, simulation resultsshown in this paper reveal that other circuit parameters should be changed by a particular percentage to accurately simulate particular fault level of transformer winding axial displacement. Results of this paper aid to precisely simulating winding axial displacement using transformer equivalent circuit that facilitates accurate qualitative and quantitative analysis of transformer FRA signatures.

show abstract

Section: Transformer Equivalent Circuit Parameters Calculationmentioning

confidence: 99%

Section: Impact Of Axial Displacment On Equivalent Electric Circuit Pmentioning

confidence: 99%