Magnetic field disturbance of partial discharge activity in a cone-plane gap

Hepburn, Donald M.; Stewart, Brian G.; Dissado, L.A.; Fothergill, J.C.

doi:10.1109/eeic.2007.4562606

Cited by 8 publications

(8 citation statements)

References 12 publications

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“…The PD intensity was amplified in the above range at magnetic field induction 80 mT, even up to 50%. In power transformers, stray leakage magnetic fields of up to 700 mT may be present 6,22 ; these could even be much higher during short-circuit currents, which would lead to winding deformations 23 . The effects of a magnetic field that is created by a load current on the partial discharge parameters in power cables and on the breakdown characteristics of impregnated paper insulation were shown in 24 .…”

Section: Effect Of Magnetic Field In Insulation Systems Of Power Devicesmentioning

confidence: 99%

“…It was found that the corona onset voltage and the breakdown voltage decreased with increasing the crossed magnetic field. The influence of a DC magnetic field on PD phase-resolved patterns in a corona cone-plane configuration was discussed in 6 . It has been shown that the magnitude and phase distributions of partial discharge patterns are affected by a perpendicular magnetic field.…”

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confidence: 99%

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Magnetic field modulated dynamics of partial discharges in defects of high voltage insulating materials

Florkowski

2022

Sci Rep

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This paper presents original measurement methodology and detection approach to determine the influence of the magnetic field on the partial discharge (PD) dynamics. The application areas refer to insulation systems of both grid and industrial network devices and emerging segments such as high-speed rail, electric vehicles or more electric aircrafts. Conventionally PD measurements are executed only in electric field, however the interaction of magnetic and electric fields influences the dynamics of PDs. The measurement technique allowed to detect quantitatively the effect of magnetic fields on PDs in two representative arrangements: in gaseous void in dielectric material and in corona point-plane setup. Measurements in both configurations have revealed amplification of PDs intensity. The quantitative comparison of PDs evolution in the magnetic field is a novel aspect shown in this paper. Combination of phase resolved images and time-sequence intensity diagrams obtained at magnetic field switching allowed to visualize and determine quantitatively this impact. This effect is attributed to the extension of the charged particle trajectory and the amplification of the electron energy due to acceleration. Thus, the investigated impact of a magnetic field can be perceived as an additional element that influences the PD dynamics.

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Section: Effect Of Magnetic Field In Insulation Systems Of Power Devicesmentioning

confidence: 99%

mentioning

confidence: 99%

Magnetic field modulated dynamics of partial discharges in defects of high voltage insulating materials

Florkowski

2022

Sci Rep

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“…In 1997, Moon et al [5] studied the effect on corona discharge, showing an increased ozone production rate. In 2007, Hepburn et al [6] were the first to study the effect on PD, showing a variation in the phase resolved pattern for a point plane configuration. This investigation centers on the effect of magnetic fields on the vegetable oil applied in power transformer.…”

Section: Introductionmentioning

confidence: 98%

Effect of external magnetic fields on the breakdown and partial discharge characteristics of vegetable oil

Xing

et al. 2015

2015 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices (ASEMD)

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Vegetable oil is based on natural ester oil, which is considered as the alternate natural source of traditional mineral insulating oil in electrical transformers. The oil applied in transformers performs dual functions of insulating and cooling materials. Partial discharges in an insulation system are incipient discharges that can damage materials and may eventually lead to complete failure of the electric transformer during operation. This paper presents an investigation on the effect of an external magnetic field on partial discharge (PD) characteristics of the vegetable oil applied in transformer. Although it has long been known that high magnetic fields are present in equipment, such as power transformers, where PD may occur, only a few investigations have been made on the effect of the magnetic field on the discharge characteristics of the traditional mineral oil. In the present study, magnetic fields of up to 500 mT were applied in the test oil samples with electric field stress simultaneously applied to produce PD. The PD characteristics along with the breakdown strength were recorded both before and after the application of the magnetic field.

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“…The effect of thermal ageing on corona discharge activity in mineral oil and natural ester under different voltage profiles were studied [11]. Apart from the local electric field, the magnetic field within the transformers can also influence the partial discharge (PD) activity [12][13][14]. However, in literature, a study of magnetic field influence on PD characteristics variation is limited.…”

Section: Introductionmentioning

confidence: 99%

Fuzzy Based Condition Monitoring Tool for Real-Time Analysis of Synthetic Ester Fluid as Transformer Insulant

et al. 2022

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The present study deals with understanding insulation performance of thermally aged synthetic ester fluid through the measurements of corona inception voltage (CIV), fluorescent characteristics and dielectric loss. CIV tests were performed on thermally aged ester fluid, under AC voltage. The reduction in CIV was observed to be 54.3 % with the thermally aged ester fluid in presence of the magnetic field. Ageing temperature and time have exerted high influence on reduction in CIV. Statistical studies have shown high scatter in CIV data due to the combined effect of thermal ageing and magnetic field. Fluorescent spectroscopy studies have revealed a progressive shift in fluorescence maxima and a decrease in emission intensity with ageing time. Dielectric spectroscopy results have confirmed a reduction in dissipation factor due to thermal ageing. The drastic reduction in CIV values, shift in spectral data and increased dissipation factor after a certain duration of time and ageing temperature evidently indicate the degradation characteristics of insulation structures. A Fuzzy model is constructed to correlate the performance analysis of thermally aged synthetic ester using the results of above mentioned characterizations techniques in order to predict the key performance index and life time estimation of insulation structures.

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Magnetic field disturbance of partial discharge activity in a cone-plane gap

Cited by 8 publications

References 12 publications

Magnetic field modulated dynamics of partial discharges in defects of high voltage insulating materials

Magnetic field modulated dynamics of partial discharges in defects of high voltage insulating materials

Effect of external magnetic fields on the breakdown and partial discharge characteristics of vegetable oil

Fuzzy Based Condition Monitoring Tool for Real-Time Analysis of Synthetic Ester Fluid as Transformer Insulant

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