Effect of hydrostatic pressure on the polarity effect of impulse breakdown characteristics of transformer oil

Wang, Tonglei; Zhang, Qiaogen; Ni, Heli; Yuan, Weixiong; Ding, Yuqin; Gao, Meng

doi:10.1109/tdei.2017.006274

Cited by 8 publications

(5 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A much higher voltage is needed to cause a puncture over a pure oil gap when higher pressure is applied [15,18,19]. The difference between the PDIVs of the open oil gap and along PB with the same electrode distance was very small [12].…”

Section: Final Flashover Voltage Under Different Hydrostatic Pressuresmentioning

confidence: 99%

“…To the best of our knowledge, the discharge property of oil-paper insulation under the variable pressure condition has not been reported yet except some previous works relating the pressure effect on pure oil gap reported in [14][15][16][17][18][19]. These papers illustrated that small bubbles in mineral oil brought in the pressure factor in the oil insulation.…”

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

The Influence of Pressure on the Discharge along Oil-Paper Interface under AC Stress

et al. 2019

Energies

View full text Add to dashboard Cite

This study explores the influence of hydrostatic pressure on the discharge along the oil-paper interface under AC voltage, especially for the normal operating condition and breakdown. In this paper, an experimental platform was set up to record the partial discharge (PD) parameters of the test sample under different hydrostatic pressures, while the applied AC voltage was increased to final flashover voltage step by step. Experimental results showed that higher hydrostatic pressure had different effects on PD under different voltages. Higher pressure decreased the PD energy and increased the flashover voltage. Furthermore, under higher hydrostatic pressure, discharge traces (white mark) were found on the surface of the samples after intense discharging on the oil-paper interfaces, indicating that the hydrostatic pressure can affect the gas generation and dissipation process underneath the surface of the pressboards. Finally, the mechanism of how hydrostatic pressure influences the PD, flashover voltage, and white mark was interpreted based on the bubble theory. The results derived in this paper can be helpful for an optimal design and reasonable operation of oil-paper insulation systems, especially for power transformers.

show abstract

Section: Final Flashover Voltage Under Different Hydrostatic Pressuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

The Influence of Pressure on the Discharge along Oil-Paper Interface under AC Stress

et al. 2019

Energies

View full text Add to dashboard Cite

show abstract

“…Olivier Lesaint revealed that the stream velocity was unchanged under different pressure if the applied voltage was constant, but the length of the stream was shortened because of the increased pressure [9]. Tonglei Wang studied the breakdown probability of needle-plate electrodes under different polarities and durations of the applied voltage [10].…”

Section: Introductionmentioning

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.

View full text Add to dashboard Cite

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.

show abstract

“…the source of the electric field. The difference between partial discharge and breakdown is that the former is restricted to a part of the insulating material [6], while the latter refers to the formation of a conducting path that fully connects the electrodes.…”

Section: Introductionmentioning

confidence: 99%

“…Discharges in liquids take place in the gas phase [7,8]. The gas bubbles may already exist prior to the discharges, or appear under electrical stress due to the electrolysis, vaporization and decomposition of the liquid [6]. The main triggering factors of PD in liquids are electro-dynamic motion, cavitations and movement of conducting particles [9].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations Performed on Surface Discharges at oil-pressboard Interface: An Overview

CHANDRASEKARAN¹

2022

Preprint

View full text Add to dashboard Cite

show abstract

Effect of hydrostatic pressure on the polarity effect of impulse breakdown characteristics of transformer oil

Cited by 8 publications

References 21 publications

The Influence of Pressure on the Discharge along Oil-Paper Interface under AC Stress

The Influence of Pressure on the Discharge along Oil-Paper Interface under AC Stress

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

Experimental Investigations Performed on Surface Discharges at oil-pressboard Interface: An Overview

Contact Info

Product

Resources

About