Application of contact analysis on evaluation of breakdown strength and PD inception field strength of solid-solid interfaces

Hasheminezhad, M.; Ildstad, Erling

doi:10.1109/tdei.2012.6148496

Cited by 53 publications

(33 citation statements)

References 9 publications

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“…It is shown for the case 1 that the estimated results agreed well with the measured ones in [3]. On the contrary, in case 2, the difference between the measured and estimated results deviated significantly [3]. Accordingly, the assumption of fixed gas pressure inside voids found to be valid and the gas pressure did not increase by applying higher contact pressure [1]- [3].…”

Section: Solid-solid Interface Models In Literaturesupporting

confidence: 56%

“…Second case, on the other hand, is the enclosed voids where the air pressure inside the voids is 1 atm prior to the application of contact pressure. Then with the increase of applied pressure, the void is compressed and air behaves as ideal gas, and hence the pressure inside the voids rises proportional to the reduced size of them (third order characteristics) [3]. It is shown for the case 1 that the estimated results agreed well with the measured ones in [3].…”

Section: Solid-solid Interface Models In Literaturesupporting

confidence: 51%

“…Then with the increase of applied pressure, the void is compressed and air behaves as ideal gas, and hence the pressure inside the voids rises proportional to the reduced size of them (third order characteristics) [3]. It is shown for the case 1 that the estimated results agreed well with the measured ones in [3]. On the contrary, in case 2, the difference between the measured and estimated results deviated significantly [3].…”

Section: Solid-solid Interface Models In Literaturementioning

confidence: 75%

“…As discussed in [1]- [3], two scenarios are possible for the estimation of gas pressure inside the cavities. First case is the ventilated voids where 1 atm air pressure is retained inside the voids irrespective of the applied pressure.…”

Section: Solid-solid Interface Models In Literaturementioning

confidence: 99%

“…Finally, the carbonized deposits bridge the electrodes and breakdown (BD) follows immediately [1]. The parameters, which mostly influence the interfacial breakdown strength, are surface roughness, contact pressure on the interface and extraneous particles or water droplets [1]- [3]. Several studies in the literature considered the electrical behavior of the solid-solid interface [9], [10].…”

Section: Introductionmentioning

confidence: 99%

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Impact of Contact Pressure on Breakdown Strength of Solid-Solid Interfaces

Kantar¹,

Panagiotopoulos²,

Ildstad³

2017

NORD-IS

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Solid-solid interfaces are considered as weak points of the insulation since combination of two solid dielectrics increases the risk of cavities and moisture at the interface against the tangential component of the applied electrical stress. The main objective of this paper is to investigate the impact of the applied contact pressure on shrinkage of the size of cavities on the interface that leads to enhancement in the breakdown strength. Experimental measurements of AC 50 Hz breakdown voltage of solidsolid interfaces assembled under standard laboratory conditions were conducted using two different specimens, namely XLPE and silicon rubber. For the same applied contact pressure, breakdown strength of XLPE-XLPE and silicon rubber-silicon rubber interfaces were also analyzed to yield the influence of elasticity modulus (softness) of the solid material on the effectiveness of the applied pressure. Two different levels of contact pressures were applied for each type of interface and higher interfacial pressure (8.02→11.59 bar) led to improved breakdown strength about 50% for XLPE-XLPE interface whereas the enhancement for the much softer interface (i.e. silicon rubber) was about 7% under increasing pressure (1.34→2.67 bar). Additionally, breakdown strength of silicon rubber interface was found to be higher than that of XLPE interface around 53% at the same applied pressure.

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