Influence of aromatic compounds in oil on pirelli gassing and impulse surge breakdown

Mathes, K. N.; Rouse, T.O.

doi:10.1109/ceidp.1975.7736643

Cited by 11 publications

(12 citation statements)

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“…Contrary to Zaky and Hawley [6], Mathes and Rouse [8] reported that the addition of a small concentration of poly-aromatic compounds significantly reduces the dielectric strength of naphthenic oil in a point-to-sphere electrode arrangement under impulse voltage. This reduction in the breakdown voltage has been attributed to the streamer development and especially to the increase in the velocity of the streamers' propagation: the faster the streamer, the lower the dielectric strength.…”

Section: Introductionmentioning

confidence: 81%

The Effect of Electronic Scavenger Additives on the AC Dielectric Strength of Transformer Mineral Oil

Khaled

Béroual

2018

Energies

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This paper is devoted to the influence of two types of electronic scavenger additives/compounds, namely, carbon tetrachloride (CCl4) and methyl iodide, which is also called iodomethane (CH3I), on the dielectric strength of transformer mineral oil. The tests are achieved in a sphere-sphere electrodes arrangement under AC voltage according to the IEC 60156 standard. The investigated additive concentrations range from 0 to 600 ppm. The verification of the conformity of the experimental results with normal and Weibull probabilistic distributions as well as the estimation of the breakdown voltage with risk probabilities of 1%, 10%, and 50% are also performed. It is shown that there is an optimum concentration of each type of electronic scavenger compound at which the dielectric strength of the mineral oil is significantly improved (i.e., it reaches a maximum value). This improvement is of 98% with 500 ppm of CH3I and 93% with 200 ppm of CCl4. It is also shown that the breakdown voltage values of all of the investigated samples with and without additives conform to a Weibull distribution but not to a normal distribution. The obtained results are discussed with regard to the possible mechanisms that may be responsible, particularly the two phases of inception and propagation of the streamers.

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Section: Introductionmentioning

confidence: 81%

The Effect of Electronic Scavenger Additives on the AC Dielectric Strength of Transformer Mineral Oil

Khaled

Béroual

2018

Energies

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“…Small concentrations of polyaromatic compounds greatly reduce the impulse breakdown voltage of a naphthenic oil between a negative point and a grounded sphere [15]. This reduction in the breakdown voltage is due either to an increase of the streamer velocity or to the diminution of the initiation volta,ge.…”

Section: Effects Of Atldltlvesmentioning

confidence: 99%

Propagation and structure of streamers in liquid dielectrics

Béroual

Zahn

Badent

et al. 1998

IEEE Electr. Insul. Mag.

280

151

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“…Most of these studies are done using impulse or step voltages. For mineral oil insulation it has been demonstrated that streamer propagation velocities and hence time to breakdown vary with voltage [10][11][12] and with chemical composition of the liquid [13][14][15][16]. It was also documented that other liquids performed differently from mineral oils [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Prebreakdown phenomena in hydrocarbon liquids in a point-plane gap under step voltage. Part 1: behaviour at positive polarity

et al. 2020

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This study addresses the dielectric performance of nonpolar hydrocarbon liquids and mineral oils under positive polarity stress. It is of interest to improve knowledge on how functional properties of dielectric liquids vary, as new brands arrive in the market, and existing standards are unsuited for documenting the dielectric functional parameters of these new liquids. Stopping length for nonbreakdown streamers, breakdown voltages and velocities for various pre-breakdown streamer modes have been studied for a selection of model liquids (cyclohexane and white oils), for a gas to liquid oil, and a refined naphthenic transformer oil. Studies of propagation modes were done using an 80 mm point to plane gap and a step voltage with a 0.5 μs rise time. Light emission and pre-breakdown currents have been recorded and instantaneous velocities have been derived from images of propagating streamers. There are clear differences in streamer stopping lengths and mode occurrence and mode velocities between these liquids. The differences seem to be influenced by molecular sizes governing evaporation energy for streamer formation and by concentration of aromatics which can be coupled to electron avalanche processes in the streamer heads.

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Influence of aromatic compounds in oil on pirelli gassing and impulse surge breakdown

Cited by 11 publications

References 0 publications

The Effect of Electronic Scavenger Additives on the AC Dielectric Strength of Transformer Mineral Oil

The Effect of Electronic Scavenger Additives on the AC Dielectric Strength of Transformer Mineral Oil

Propagation and structure of streamers in liquid dielectrics

Prebreakdown phenomena in hydrocarbon liquids in a point-plane gap under step voltage. Part 1: behaviour at positive polarity

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