The effect of electrode shape, gap and moisture on dielectric breakdown of transformer oil

Yılmaz, Hülya; Güler, Sönmez

doi:10.1109/icdl.1996.565515

Cited by 10 publications

(7 citation statements)

References 3 publications

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“…Although dielectric liquids are easy to implement in the insulating systems and provide electrical insulation effectively, they are very sensitive to impurities due to their specific chemical structure. In particular, pollutant materials within the structure such as solid particles [3,4], gas bubbles [5], or water droplets [6,7] greatly reduce the dielectric performance of insulating liquids [8]. There are many methods, such as, for example, the AC breakdown voltage and dielectric dissipation factor measurement, gas chromatography, and the determination of the moisture content in oil, which are used to estimate the condition of a given dielectric liquid [9,10].…”

Section: Introductionmentioning

confidence: 99%

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Using the Method of Harmonic Distortion Analysis in Partial Discharge Assessment in Mineral Oil in a Non-Uniform Electric Field

et al. 2020

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In high-voltage equipment, it is vital to detect any failure in advance. To do this, a determination of the partial discharges occurring at different voltage types as well as at different electrode configurations is essential for observing the oil condition. In this study, an experimental setup consisting of a needle–semi-sphere electrode configuration immersed in mineral oil is prepared for laboratory experiment. In such a way, a non-uniform electric field is created and the leakage currents are monitored from the grounded electrode. A total of six different electrode configurations are analyzed during the tests by the use of hemispheres of different diameters as grounded electrodes and copper and steel pointed (medical) needle high-voltage electrodes. In the experiments, the partial discharges occurring at four different voltage levels between 5.4 and 10.8 kV are measured and recorded. The effect of the different electrode configurations and voltage levels on the harmonic distortion are noted and discussed. It is experimentally confirmed that it is possible to measure the leakage current caused by the partial discharges of the corona type in oil at the different metal points, creating high-voltage electrodes and different electric field distributions based on the proposed non-invasive measurement technique. The studies showed that there is a significant rise of even harmonic components in the leakage current during the increase in the partial discharge intensity with the 5th harmonic as dominant.

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Section: Introductionmentioning

confidence: 99%

“…In addition to the above-mentioned indirect, non-invasive methods of PD analysis of the oil-insulated systems, the most reliable method is still the electrical method based on IEC 60270 Standard [7]. By means of a specially designed testing system, a quantitative assessment of PD intensity is possible.…”

Section: Introductionmentioning

confidence: 99%

Using the Method of Harmonic Distortion Analysis in Partial Discharge Assessment in Mineral Oil in a Non-Uniform Electric Field

et al. 2020

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“…It is referred to as withstand voltage where the probability of failure at a given voltage is so low that it is considered at the moment of designing insulation, with the assurance that the material will not fail at this voltage [20]. The breakdown voltage of oil depends on the water saturation [21,22]. When the water present in the oil increase, the breakdown voltage will be decreased.…”

Section: Introductionmentioning

confidence: 99%

Virgin coconut oil dielectrical properties as electrical insulation material

Sauki¹,

Muhamad²,

Rasid³

2019

Bulletin EEI

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Mineral oil played an important role as insulating liquid such as to reduce failure, ageing effect, increase the life span and heat transfer agent. Mineral oil had a good dielectric strength and cooling performance but it had serious negative environmental impact like non-biodegradable, non-renewable resource and difficult to dispose when it deteriorates completely. Hence, virgin coconut oil (VCO) was chosen as alternative to replace mineral oil since it biodegrades completely without toxic and easy to get in the tropical country. Three dielectric tests were conducted to investigate the dielectric properties of VCO. Those were breakdown voltage, water content and kinematic viscosity. A study about the effect of the moisture level of VCO on the breakdown voltage and kinematic viscosity was also presented. VCO and mineral oil also undergone heating process to reduce moisture in sample. The study showed that VCO has good potential breakdown voltage with the ability to absorb a lot of moisture keeping the KRAFT paper dry. However, VCO had very high kinematic viscosity compared to mineral oil. Further, the rate of breakdown voltage decreases with increasing of moisture of VCO was lower than mineral oil.

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“…[2,3]'deki çalışmalarda IEC 60156 standardına göre yapılan deneylerde standart sapmayı azaltmak ve deneysel ölçmeyi iyileştirmek için önerilerde bulunulmuştur. Literatürde, yalıtkan sıvı içerisinde bulunabilen katı parçacıkların [4,5], gaz kabarcıklarının [6,7] ve su damlacıklarının [8,9] delinme gerilimi üzerindeki etkileri incelenmiştir. Yalıtkan sıvı içerisindeki yabancı parçacıkların yağın dielektrik dayanımı üzerinde olumsuz bir etkiye sahip olduğu bilinmektedir.…”

Section: Gi̇ri̇ş (Introduction)unclassified

“…Bunun nedeni, disk elektrotun daha yüksek elektrik alana sebebiyet veren eğrilik yarıçapı küçük kenarlara sahip olmasıdır. Elektrotların keskin kenarlarında elektrik alan şiddeti daha yüksek olduğu için delinme öncelikle bu kenarlardan başlar[9,18]. Yalıtkan yağda delinme yağ içindeki yabancı parçacıklara ve serbest yüklere de bağlıdır.…”

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Yalıtkan sıvıların delinme deneylerinde kullanılan farklı elektrot sistemlerinin SEY ile elektrik alan incelemesi

Taslak

Kalenderli

2018

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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Effect of voltage rise rate and electrode geometry on the breakdown voltage of mineral oil  Electric field analysis in VDE and disk electrode systems  Determination of the critical breakdown area in the presence of foreign particles Figure A. The electrical field distributions for VDE electrodes (at left) and for disk electrodes (at right) Table A. Maximum electric field intensities in mineral oil for different electrode systems (V/m) Electrode type Critical electric field line analyzed Maximum electric field intensity  10 5 (V/m) Without foreign particles Air bubble Water drop VDE Axis

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The effect of electrode shape, gap and moisture on dielectric breakdown of transformer oil

Cited by 10 publications

References 3 publications

Using the Method of Harmonic Distortion Analysis in Partial Discharge Assessment in Mineral Oil in a Non-Uniform Electric Field

Using the Method of Harmonic Distortion Analysis in Partial Discharge Assessment in Mineral Oil in a Non-Uniform Electric Field

Virgin coconut oil dielectrical properties as electrical insulation material

Yalıtkan sıvıların delinme deneylerinde kullanılan farklı elektrot sistemlerinin SEY ile elektrik alan incelemesi

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