Virtual instrumentation for Partial Discharge monitoring

Carvalho, André T.; Amorim, H. P.; Cunha, Caio F. C.; Rodrigues, Thiago Bittencourt; Brasil, Fernando S.; Vilhena, Paulo R. M. de; Carvalho, Daniel. S.

doi:10.1109/eic.2017.8004640

Cited by 5 publications

(2 citation statements)

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“…All currents and voltage at the search coils were monitored and recorded by a digital system called IMA-DP [36,37], which stored the RMS, max, min and mean values every 5 and 9-cycle samples of the waveform at intervals of 30 s. The conductor surface temperature was monitored and recorded by a second digital system, with a 7-s storage interval. Both systems were placed in a separated room, over 3 m away from the experiment.…”

Section: Methodsmentioning

confidence: 99%

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: Methodsmentioning

confidence: 99%

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

View full text Add to dashboard Cite

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“…In the studies of [75][76][77][78], data from hydro generators were analyzed using the IMA-DP produced by the CEPEL [79,80]. In [75][76][77] the PRPD patterns obtained from the IMA-DP are analyzed using images.…”

Section: Machine Learningmentioning

confidence: 99%

Partial Discharges Monitoring for Electric Machines Diagnosis: A Review

et al. 2022

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Online monitoring of Partial Discharges (PDs) in rotating electrical machines is an useful tool for machine prognosis, as it presents reduced costs compared to intrusive inspections and is associated with relevant problems. Although this monitoring method has been developed for almost 50 years, the recent advancements in processes automation and signal processing techniques allow improvements that are still being studied by academic and industrial researchers. To analyze the current context of PDs monitoring, this article presents a literature review based on concepts of PDs in rotating machines, data acquisition techniques, state-of-the art commercial equipment, and recent methodologies for detection and pattern recognition of PDs. The challenges identified in the literature that motivate the development of more reliable and robust PD monitoring systems are presented and discussed.

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