Influence of hydrostatic pressure on creeping discharge characteristics over solid/liquid insulating interfaces under AC and DC voltages

Béroual, Abderrahmane; Khaled, Usama

doi:10.1049/iet-gtd.2017.0622

Cited by 7 publications

(6 citation statements)

References 19 publications

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“…10 respectively, and the discharge length curves show a quasi-linear behevior with the applied voltage irrespective of the oil level when the solid samples are immersed in copra-type coconut oil. Such a variation on the discharge length was observed for different hydrostatic pressure values by Beroual et al in 2002Beroual et al in , 2003Beroual et al in , and in 2008 under AC, DC, and impulse voltages with solid samples immersed in petroleum-based mineral oil (Kebbabi & Beroual, 2003;Beroual & Kebbabi, 2008;Beroual & Khaled, 2018).…”

Section: Conflict Of Interestmentioning

confidence: 55%

“…The influence of hydrostatic pressure on creeping discharges has been studied (Kebbabi & Beroual, 2003;Beroual & Kebbabi, 2008;Matharage et al, 2013;Beroual & Khaled, 2018), and according to these findings, low-density gaseous channels are affected by the hydrostatic pressure. In the current study, the level of copra-type coconut oil inside the test cell is changed in order to analyse the effect of the oil level over the solid sample on creeping discharge propagation, and glass material samples are used.…”

Section: Methodsmentioning

confidence: 99%

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Investigation of oil level and type of solid insulator on creeping discharges propagating under an ac electric field

Ediriweera

Jayarathna

Samarasinghe

et al. 2022

J. Natn. Sci. Foundation Sri Lanka

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This paper presents a study on the use of different solid insulators and oil volumes inside oil-filled high voltage equipment to minimize the effect of damage that occurs due to creeping discharge activity. A point-plane electrode arrangement-based test apparatus, energized by a high voltage supply, is used for analyzing the propagation of creeping discharges over solid/coconut oil interfaces using visual observation. In particular, the effect of oil level and the effect of the kind of solid insulators, such as glass and acrylic, are analyzed incorporating the discharge length associated with pattern propagation. The result shows that the glass and acrylic insulators do not have a significant effect on the discharge length when they are immersed in coconut oil even if the breakdown voltage of acrylic is higher than that of glass by 28%. The results also show that when the oil level inside the test cell increases, the amount of ramification and propagation of streamers decreases, reducing the discharge length. The fall of the coconut oil level under electric field-generated electrodynamics motion inside the oil-filled high voltage equipment can create an opposition force on the discharge propagation. However, such a phenomenon can initiate discharge propagation at low voltage values.

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Section: Conflict Of Interestmentioning

confidence: 55%

Section: Methodsmentioning

confidence: 99%

Investigation of oil level and type of solid insulator on creeping discharges propagating under an ac electric field

Ediriweera

Jayarathna

Samarasinghe

et al. 2022

J. Natn. Sci. Foundation Sri Lanka

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“…This proves that pressure suppresses gas and discharge in the oil. In [11,21], based on the reduction of the length, number, and volume of the tree branches along the pressboard's surface under increased pressure, the author believed that the creepage must have gaseous nature. In [8,11,21], the increased hydraulic pressure restrained the stream and creepage along the solid surface in oil.…”

Section: Circumstantial Evidences In Other Studiesmentioning

confidence: 99%

“…In [11,21], based on the reduction of the length, number, and volume of the tree branches along the pressboard's surface under increased pressure, the author believed that the creepage must have gaseous nature. In [8,11,21], the increased hydraulic pressure restrained the stream and creepage along the solid surface in oil. All these researches show that gas is the key factor influencing discharge in oilimmersed insulation.…”

Section: Circumstantial Evidences In Other Studiesmentioning

confidence: 99%

Experimental verification of the inhibiting effect of hydraulic pressure on point discharge in oil-paper insulation under constant AC voltage

Liu

Dai

et al. 2023

J. Phys. D: Appl. Phys.

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This paper reports experimental studies of point discharge in oil-paper insulation under different hydraulic pressures. The point partial discharge of oil-paper insulation under different hydraulic pressure was measured for the first time. With the help of a commercial partial discharge detector, five discharge parameters under constant AC voltage were recorded and plotted as curves. It shows that the partial discharge under very low pressure developed very quickly after it was initiated. So, it should be careful with oil-paper equipment operating at high altitudes, because once the discharge is initiated, it would develop into a catastrophe in a relatively short time. The partial discharge inception voltage and breakdown voltage increased with pressure, but the rising rates decreased with the increase of pressure. The discharge parameters decreased with pressure but the difference between the adjacent curves became smaller and smaller, which is called the saturation characteristic of hydraulic pressure’s effect on discharge. Therefore, very high hydraulic pressure is not necessary in weakening the partial discharge in oil paper insulation. It is believed that the hydraulic pressure influences the discharge in the oil-paper insulation by changing the state of the gas in this compound insulation system. This paper provides a reference for the operation and maintenance of oil-paper insulation equipment running in high-altitude areas. Adjusting hydraulic pressure might be an effective and economical way to reduce the size and weight of oil-paper insulation equipment.

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“…Beroual and Khaled [16] have studied surface discharge activity and have indicated that for a given voltage, the final discharge length is high under AC voltage and the least under negative DC voltage. Du et al [17] have indicated that charge trapping is high under negative polarity than the positive polarity and the positive charge gets discharged quickly.…”

Section: Surface Discharge Inception Voltage Analysis Adopting Uhf Tementioning

confidence: 99%

Investigation on Insulation Performance of Thermally Aged Natural Ester Oil Impregnated Pressboard

Thakur

Sarathi

2019

IET Science, Measurement & Technology

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Influence of hydrostatic pressure on creeping discharge characteristics over solid/liquid insulating interfaces under AC and DC voltages

Cited by 7 publications

References 19 publications

Investigation of oil level and type of solid insulator on creeping discharges propagating under an ac electric field

Investigation of oil level and type of solid insulator on creeping discharges propagating under an ac electric field

Experimental verification of the inhibiting effect of hydraulic pressure on point discharge in oil-paper insulation under constant AC voltage

Investigation on Insulation Performance of Thermally Aged Natural Ester Oil Impregnated Pressboard

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