Investigation on Impact of Magnetic Field on the Corona Discharge Activity in Punga Oil Using Fluorescent Fiber and UHF Sensor Techniques

Murugesan, S.; Amalanathan, A. J.; Sarathi, R.; Srinivasan, Balaji; Samikannu, Ravi

doi:10.1109/access.2021.3113332

Cited by 14 publications

(6 citation statements)

References 34 publications

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“…The use of several fibers investigated for PD detection in transformers [30] is already documented in the literature but there is no database available for particle movement initiated partial discharges. Hence, in the present work, the white fiber has been chosen since it exhibits excitation and emission wavelengths similar to the natural ester fluid and it has a higher sensitivity than the red fiber [31]. Among the different fluorescent fibers used for PD detection, the red and white fibers correspond to higher wavelength regions where an increased Stokes shift is involved similar to the current results [28].…”

Section: Resultsmentioning

confidence: 57%

Effect of Magnetic Field on Partial Discharge Initiated by Metallic Particle in Thermally Aged Natural Esters Under AC and Harmonic Voltages

et al. 2022

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This paper reports the experimental and theoretical investigations of particle levitation voltage on thermally aged ester fluid, under AC and harmonic AC voltages, in the presence of both electric and magnetic fields (130 mT and 160 mT). The results indicate a higher sensitivity to identify partial discharge (PD) initiated due to particle movement in aged ester fluids with an ultra-high frequency (UHF) sensor than the fluorescent fiber technique. The cause for the reduction in sensitivity of PD detection due to the fluorescent fiber technique with thermally aged fluid is analyzed using steady-state fluorescent measurement. The reduction in the levitation voltage noticed under high-frequency AC voltages is much more severe than its impact under the fundamental frequency of AC supply voltage. In addition, the presence of a magnetic field reduces the magnitude of levitation voltage substantially. The UHF signals generated due to particle movement-initiated discharges with aged ester fluids indicate a shift in its dominant frequency of 0.9 GHz under the absence of a magnetic field to around 0.6 GHz with the effect of a magnetic field.

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Section: Resultsmentioning

confidence: 57%

Effect of Magnetic Field on Partial Discharge Initiated by Metallic Particle in Thermally Aged Natural Esters Under AC and Harmonic Voltages

et al. 2022

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“…It was also observed that the inception voltage of a corona was greater in a positive corona without a magnetic field, whereas the opposite occurred in a crossed magnetic field. Investigations of a magnetic field's impact on corona discharges in oil were presented in Murugesa et al [30] using fluorescent and UHF detection. The behavior of corona discharge in mineral oil under AC subjected to a magnetic field was analyzed in [31].…”

Section: Introductionmentioning

confidence: 99%

Effect of Interplay between Parallel and Perpendicular Magnetic and Electric Fields on Partial Discharges

Florkowski

2023

Energies

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This paper reports on the influence of a magnetic field on the dynamics of partial discharges (PDs) in two distinct configurations with respect to the mutual orientation of electric fields. The broad application areas include electrical insulation systems of both high-voltage grids and industrial network devices as well as emerging segments such as electric vehicles or more electric aircraft. Traditionally, PD measurements are only carried out in an electric field. In all current-carrying power equipment, magnetic fields are also superimposed onto electric ones, thus influencing partial discharge behavior. It has been observed that the interplay between electric and magnetic fields influences the dynamics of PDs; parallel and perpendicular mutual orientations were specifically investigated. The measurement technique allowed us to quantitively detect the effect of magnetic fields on PDs in a corona point–plane arrangement. The novel element presented in this article is a detection of PD intensity modulated by a magnetic field, with both perpendicular and parallel orientations with respect to electric one, and a quantitative visualization in the form of the time-sequence diagrams. The simulation of electron trajectories in the presence of electric and magnetic fields revealed the elongation of the pathways and differentiation of the charged particle propagation times. The perpendicularly oriented magnetic field led to a twisting effect, whereas the parallel alignment reflected the propagation along a helical trajectory. A slightly stronger PD intensity amplification effect was observed in the case of a parallel alignment of electric versus magnetic fields as compared with the perpendicular orientation. The presented results may contribute to PD measurement methodology in both electric and magnetic fields as well as a better understanding of the underlying physical mechanisms. The observed effect of the modulation of the magnetically based PD dynamics may be relevant for the insulation systems of power equipment.

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“…These environment and fire safety consideration have led to the investigation and research on alternative dielectric liquids. Recently, ester based liquids have emerged as suitable replacements for the conventional mineral oil in large power transformers [1]- [4].…”

Section: Introductionmentioning

confidence: 99%

“…Importantly, there are only few studies available on the influence of the magnetic field on partial discharge activity in transformers. Studies have shown that physical and chemical interactions, in the presence of magnetic field, can alter the PD characteristics of an insulation system [4], [20], [21]. The magnetic field can influence the UHF measurement of PD activity by reducing the power spectral density of the UHF signal [24], [25].…”

Section: Introductionmentioning

confidence: 99%

Effect of Zeolite Addition on Partial Discharge and Dielectric Behavior of Thermally Aged Synthetic Ester Fluid Under External Magnetic Field

et al. 2022

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In recent times, ester based liquids have met high standards and are being considered as potential alternatives over mineral oil transformer insulation. This paper investigates the effect of adding micro-porous zeolite to the thermally aged synthetic ester oil (SEO) to evaluate its electrical performance under the influence of external local magnetic field variation from 0 mT to 165 mT. It is observed that the Corona Inception Voltage (CIV) and Particle Levitation Voltage (PLV) have a declining tendency with ageing, in the presence of magnetic field. Under the influence of magnetic flux density ( 160 mT), the detected UHF signal was dominant at low frequencies (400 MHz -900 MHz). The UHF voltage signals peak-to-peak magnitude demonstrates that the discharge magnitude increases with increased ageing duration. Further, it was observed that the addition of zeolite in the synthetic ester liquid tends to improve the electrical performance of the aged oil. The fluorescence spectroscopic analysis shows a shift of the fluorescence maxima together with increased intensity in samples with zeolite as compared to the samples without zeolite addition, which shows a relatively lower concentration of the polar contamination. The frequency dielectric spectroscopy also confirms that synthetic ester specimens showed improved dielectric properties after the zeolite treatment.

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Investigation on Impact of Magnetic Field on the Corona Discharge Activity in Punga Oil Using Fluorescent Fiber and UHF Sensor Techniques

Cited by 14 publications

References 34 publications

Effect of Magnetic Field on Partial Discharge Initiated by Metallic Particle in Thermally Aged Natural Esters Under AC and Harmonic Voltages

Effect of Magnetic Field on Partial Discharge Initiated by Metallic Particle in Thermally Aged Natural Esters Under AC and Harmonic Voltages

Effect of Interplay between Parallel and Perpendicular Magnetic and Electric Fields on Partial Discharges

Effect of Zeolite Addition on Partial Discharge and Dielectric Behavior of Thermally Aged Synthetic Ester Fluid Under External Magnetic Field

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