New method for prediction of insulating liquid AC breakdown

Marković, Mladen; Štih, Željko

doi:10.1109/tdei.2016.005940

Cited by 6 publications

(2 citation statements)

References 30 publications

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“…Як правило, такі ВВУ працюють на промисловій частоті та містять: високовольтний підвищувальний трансформатор, регулятор напруги, пристрій для перемішування рідких діелектриків, систему управління, випробувальна комірку з електродами. В теперішній час як вітчизняними, так і закордонними фірмами випускаються різні ВВУ для визначення Uпр., наприклад: OTS 80, OTS 100 («Megger», Велика Британія) [6], DTA 100 С («BAUR», Австрія) [7], АИМ -90А («Медрентех», Росія), OLT -90A/M (ООО «Харківенергоприлад, Україна) та ін.…”

Section: постановка проблемиunclassified

Dielectric Oil`s Test Machine Wish Voltage Rise Electronic Module

Bogatirov¹,

Ponuzhdayeva²,

Koliushko³

et al. 2021

Вісник НТУ "ХПІ"

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For test operations according to the liquid dielectric breakdown voltage measurement method we use high voltage machines that consist of high-voltage step-up transformer, voltage rise block, test cell with electrodes and so on. Described dielectric oil's test machine UIM – 90 with electromechanical voltage rise block. Cause of hard requirements in specification documents about voltage sine wave form on cell's electrodes, we performed field tests for UIM – 90 that help to evaluate the mains voltage impact on the test voltage distortion and measurement accuracy. Was discovered that during usage of electromechanical voltage rise block voltage steps disrupt sine wave’s form proportionally to step-up transformer’s transformation coefficient. Performed analysis of this block’s construction and established that usage of ЛАТР and mechanical voltage controller could lead to additional sine’s wave disruption. Decided to develop electronic voltage rise block which will allow to get rid of mains influence on test data. Created the algorithm of wave shaping from microcontroller, which generates voltage ramp to the amplifier representing pulse width modulator, then to the step-up transformers cascade. Proposed to use additional transformer for level matching of amplifier’s output voltage and main high voltage transformer’s input voltage. Presented flow sheet for UIM – 90 with electronic voltage step-up block and cascading start ofstep-up transformers. Provided voltage oscillograph trace and it spectrograph on the main transformer’s primary side, received due to the implementation of developed electronic voltage step-up block, prove that voltage sine wave form doesn’t rely on mains quality. After upgraded UIM – 90 and it world analogues technical parameters analysis we could make a conclusion about it competitive capability on global level.

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Section: постановка проблемиunclassified

Dielectric Oil`s Test Machine Wish Voltage Rise Electronic Module

Bogatirov¹,

Ponuzhdayeva²,

Koliushko³

et al. 2021

Вісник НТУ "ХПІ"

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“…7. Moreover, a short oil gap requires higher electric field to stimulate the breakdown compared with a long one [57].…”

Section: Pd Induced By Conductive Particlementioning

confidence: 99%

Review about PD and breakdown induced by conductive particles in an insulating liquid

et al. 2020

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In insulating liquid, a conductive particle becomes charged through the interaction with a conductor exposed to an applied field. Then, it migrates in the action of both electric field and fluid and causes the enhancement of local field when it is in proximity of the conductor with opposite polarity. The enhancement will lead to partial discharge (PD) and may even ignite full gap breakdown in special cases. This study reviews comprehensive researches relevant to these topics. In the first place, several theoretical methods about how to obtain the charges held by a conductive particle with known potential are introduced, so are experimental methods. Then, forces acting on the charged particle in liquid are classified, and its migration characteristics, as well as influential factors, are described. Subsequently, PD and breakdown mechanisms of liquid initiated by conductive particles are presented. The latter involves two cases: electric-field enhancement when the particle concentration is low and bridging phenomenon when it is high. At last, two important, but frequently ignored factors, i.e. dielectric barrier and oil flow, are highlighted, and the authors' suggestions for future work are put forward.

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Breakdown withstand of insulating liquid with paper insulated electrodes : A numerical approach

Marković¹

2018

2018 IEEE 2nd International Conference on Dielectrics (ICD)

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New method for prediction of insulating liquid AC breakdown

Cited by 6 publications

References 30 publications

Dielectric Oil`s Test Machine Wish Voltage Rise Electronic Module

Dielectric Oil`s Test Machine Wish Voltage Rise Electronic Module

Review about PD and breakdown induced by conductive particles in an insulating liquid

Breakdown withstand of insulating liquid with paper insulated electrodes : A numerical approach

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