Experimental study on the transformer effect in an ACSR cable

Meyberg, Ruyguara A.; Salas, Farith M. Absi; Domingues, Luis Adriano M. C.; Barros, Maria Teresa Correia de; Lima, Antonio C. S.

doi:10.1016/j.ijepes.2020.105861

Cited by 14 publications

(10 citation statements)

References 28 publications

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“…Results previously obtained using this experimental arrangement were presented in [35] for a total current up to 1100 A, showing that the concentration of current in the middle layer increases with the intensity of the current carried by the conductor, as a result of the transformer effect. Furthermore, a current redistribution was found with increasing conductor temperature.…”

Section: Resultsmentioning

confidence: 95%

“…For the different total current intensities, results in Figures 13 and 14 show two distinct behaviours of the magnetic flux along time and thus during the conductor heating process. For total current intensities bellow 1000 A, the magnetic flux continuously increases with temperature, as noted in [35], where the magnetic flux was analysed for a total current of 900 A. However, from 1000 A up to 2300 A, the magnetic flux along time presents a hump shape, that is, it increases with temperature, reaches a maximum value at the intermediate time (

t_{m}

), marked in Figures 13 and 14 with a vertical line, and then decreases.…”

Section: Resultsmentioning

confidence: 96%

“…It is seen from results that the current density distribution is affected by the transformer effect: a concentration of the current density in the middle layer, which increases with the intensity of the current carried by the conductor. It is also observed a shift of current from inner to outer layer with increasing conductor temperature, due to a radial gradient of temperature [35], thus increasing with the intensity of the total current.…”

Section: Resultsmentioning

confidence: 99%

“…The present study was carried out using the same experimental arrangement as in [35]. A 10.4 m span of a three‐layer ACSR “ Duck ” conductor was tested, which has 54 aluminum strands and a 7‐strand steel core.…”

Section: Methodsmentioning

confidence: 99%

“…The uncertainties of the current transformers are about 2%. Further details on the arrangement are given in [35]. Conductor details are given in Appendix.…”

Section: Methodsmentioning

confidence: 99%

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Magnetic properties of an ACSR conductor steel core at temperatures up to 230 ∘C and their impact on the transformer effect

Meyberg

Salas

Domingues

et al. 2021

IET Science Measure & Tech

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The current density distribution between layers of steel‐reinforced conductors having an odd number of aluminum layers is modified by the transformer effect, as a result of the steel core magnetisation. This redistribution of current affects the conductor alternating current resistance, the transitory temperature radial distribution, and depends on the total current intensity, and the core permeability, which varies with temperature. Although some steel‐cored conductors are designed to operate at high temperatures to maximise their current capacity, the core magnetic properties in this scenario need to be further investigated. This paper presents the results of experimental work on an ACSR conductor, and on its steel core to investigate the steel core magnetic properties over an extended temperature range, and how they affect the transformer effect. Results show an unexpected hump‐shaped variation of the permeability with temperature in a specific range of magnetic field strength, with maximum permeability values occurring at a temperature ranging from 150 to 170 ∘C , which were not covered in previous studies. A similar behaviour is seen in the variation of the axial magnetic flux with increasing conductor temperature, causing the flux to decrease at high temperatures, and thus weakening the transformer effect during the conductor operation.

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Section: Resultsmentioning

confidence: 95%

t_{m}

), marked in Figures 13 and 14 with a vertical line, and then decreases.…”

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…The uncertainties of the current transformers are about 2%. Further details on the arrangement are given in [35]. Conductor details are given in Appendix.…”

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations