Effect of impurities on the breakdown of insulating oil in long gaps

Fleszyński, J.; Lutynski, B.; Skowronński, J.I.

doi:10.1016/0304-3886(79)90060-3

Cited by 4 publications

(6 citation statements)

References 5 publications

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“…On the other hand, a composite AC/DC voltage gives breakdown strength results between the AC voltage and the DC voltage [38]. It has also been indicated [39] that with DC voltages, point-plane electrodes and pure oil, the breakdown strength was higher with the point electrode negative, whereas with contaminated oil -and especially at higher applied voltages-there was an inversion in experimental results, i.e. the positive point gave the higher breakdown strength.…”

Section: The Effect Of Impuritiesmentioning

confidence: 99%

“…the positive point gave the higher breakdown strength. Such an inversion was explained as due to space charges, which may be particularly noticed in contaminated oil [39]. Different kinds of particles (metallic, cellulose and mixed) were investigated with DC voltages and uniform electrode arrangement in [40] and it was observed that mixed (i.e.…”

Section: The Effect Of Impuritiesmentioning

confidence: 99%

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A Short Review of Some of the Factors Affecting the Breakdown Strength of Insulating Oil for Power Transformers

Danikas

Sarathi

Morsalin

2020

Eng. Technol. Appl. Sci. Res.

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The present short review investigates some of the factors affecting the breakdown strength of transformer oil. Factors such as the conditioning effect, effect of oil flow, influence of impurities, type of applied voltage and electrode configuration and geometry are further discussed. It should be noted that this review does not discuss the effect of factors such as area, volume and capacitance. Velocity, impurities, electrodes’ shape and the type of applied voltage are among the factors documented to have a significant effect on breakdown strength.

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Section: The Effect Of Impuritiesmentioning

confidence: 99%

Section: The Effect Of Impuritiesmentioning

confidence: 99%

A Short Review of Some of the Factors Affecting the Breakdown Strength of Insulating Oil for Power Transformers

Danikas

Sarathi

Morsalin

2020

Eng. Technol. Appl. Sci. Res.

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“…In addition to water, there may be other contaminants in the oil, in particular metallic particles, released from the windings or the tank; or dielectrics, released from the insulation (paper, pressboards). However, it is worth noting that when the distance between the electrodes is higher then we observe less influence of the impurities and water content on the electric strength of oil [8,9].…”

Section: Introductionmentioning

confidence: 81%

“…Moisture content and impurities in the oil volume also influence the AC BDV. In oil, water may be dissolved or emulsified [7][8][9]. The amount of water dissolved in the oil depends on the temperature, level of aging, and type of oil.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, when lightning impulse (LI) voltage is considered, even in the case of small electrode gaps, the influence of moisture and other impurities on the electrical strength is weak [7][8][9]. Other factors influencing the electrical strength of oil are the shape of the electrodes, gap between them or voltage polarity, for DC (direct current) and LI voltage.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Temperature on Lightning Performance of Mineral Oil

et al. 2022

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This article deals with the influence of temperature on the lightning impulse breakdown voltage (LI BDV) of mineral oil in a non-uniform electric field. The experiments were performed in point–plane electrode arrangements under a standard lightning impulse voltage of negative polarity. The LI BDV for the temperatures of 20, 40, 60, 80, 100 and 110 °C was measured using a step method with registration of the light signals emitted during pre-breakdown and breakdown phases. The average propagation velocity was also determined. The results confirm that the mineral oil tested under LI voltage behaves similarly to AC voltage-based stress. The LI BDV increases with temperature up to 100 °C and then tends to decrease. The results demonstrated that viscosity dependent processes are responsible for increasing the LI BDV with temperature up to the 100 °C; and liquid vapor formation processes are responsible for decreasing the LI BDV at temperatures equal to and higher than 100 °C.

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