Study of Oil/Pressboard Creeping Discharges under Divergent AC Voltage—Part 1: Fundamental Phenomena and Influencing Factors

Zhou, Xin; Werle, Peter; Gockenbach, E.; Shi, H.B.; Kuhnke, Moritz

doi:10.1109/tdei.2020.009196

Cited by 11 publications

(1 citation statement)

References 15 publications

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“…Based on the above analysis, we built a research platform for studying transition process from partial discharge to early arc discharge based on fibre‐optic ultrasonic, temperature, pressure sensors with traditional electrical voltage and current sensors. The needle–plate, plate–plate, creeping discharge [14], air cavity, and inter‐turn discharge models were produced. A comprehensive multiparameter analysis of the transition process of different discharge types from partial discharge to arc discharge was performed.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the transition process from partial discharge to arc discharge of oil–paper insulation based on fibre‐optic sensors

Zhang

Chen

et al. 2022

IET Generation Trans & Dist

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Arc discharge in the power transformer can bring enormous economic losses and safety risks. The transformer protection system for arc discharge faults is still not ideal. The physical characteristics of the whole process from partial discharge defects transition to arc faults are not fully recognized, mainly because it is difficult to establish and sense the relevant characteristic parameters. This paper built a research platform for studying the transition process from partial discharge to early arc discharge based on fibre‐optic ultrasonic, temperature, pressure sensors with traditional electrical voltage and current sensors. Five discharge models are designed and the changing pattern of multiple parameters in the transition process of different models is studied. The experiment results show that the amplitude and frequency of acoustic waves drop significantly after the arc breakdown. Ultrasonic and high‐frequency current sensing in the early warning of arc fault each has its own limitations. The pressure caused by the arc is not only related to the arc energy but also related to the discharge types. The overall oil temperature change after the early arc discharge is small and hard to detect. This work highlights the promise of using fibre‐optic sensors for physical process research within a harsh electromagnetic environment.

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Section: Introductionmentioning

confidence: 99%

Experimental study on the transition process from partial discharge to arc discharge of oil–paper insulation based on fibre‐optic sensors

Zhang

Chen

et al. 2022

IET Generation Trans & Dist

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Real-time analysis of the associated currents of creeping discharge propagating over different liquid/pressboard interfaces under lightning impulse voltages

et al. 2023

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The research on the surface discharge intensity and its damage to the pressboard in oil-paper insulation under different hydraulic pressures

Hu,

Yang,

Zhou

et al. 2024

AIP Advances

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The internal conducting components of power transformers are predominantly insulated by oil and paper, which is vital for ensuring transformers’ safety and reliability. The degradation of oil-paper insulation is primarily induced by discharge, significantly influenced by hydraulic pressure. This study investigates surface partial discharge in oil-paper insulation under varying hydraulic pressures with the help of a novel, self-designed test apparatus. Key discharge parameters were systematically recorded utilizing a commercial partial discharge detector. Findings indicate that both partial discharge inception voltage (PDIV) and breakdown voltage exhibit an increasing trend with increasing pressure, albeit with diminishing rates of increase. Notably, the differential between breakdown voltage and PDIV initially decreases and subsequently exhibits a marginal increase with higher hydraulic pressures. Overall, discharge parameters decrease with increasing pressure, with both average partial discharge values and partial discharge power showing consistent reductions. Surface phenomena and microstructural analyses were conducted to elucidate the structural damage mechanisms induced by discharge. In addition, chemical group and elemental content analyses were performed to infer the underlying principles governing pressboard alterations. These findings provide valuable insights for the operation and maintenance of oil-paper insulated equipment in high-altitude environments and establish a foundation for optimizing the size and weight of oil-paper insulation systems by modulating internal hydraulic pressure in power transformers.

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Study of Oil/Pressboard Creeping Discharges under Divergent AC Voltage—Part 1: Fundamental Phenomena and Influencing Factors

Cited by 11 publications

References 15 publications

Experimental study on the transition process from partial discharge to arc discharge of oil–paper insulation based on fibre‐optic sensors

Experimental study on the transition process from partial discharge to arc discharge of oil–paper insulation based on fibre‐optic sensors

Real-time analysis of the associated currents of creeping discharge propagating over different liquid/pressboard interfaces under lightning impulse voltages

The research on the surface discharge intensity and its damage to the pressboard in oil-paper insulation under different hydraulic pressures

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