Particle Contamination Levels in Oil-Filled Large Power Transformers

Oommen,; Petrie,

doi:10.1109/mper.1983.5519190

Cited by 2 publications

(2 citation statements)

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“…Let us check the Reynolds number for the case that a spherical particle is travelling in the transformer oil. With typical values of the parameters from measurements [11, 31], R e is obtained. It is found that under the circumstance corresponding to the actual one (frequently R <0.1 mm, v <1 m/s), the Reynolds number is generally below 1, so (19) for F d has been widely used [20, 32], as shown in Fig.…”

Section: Movement Of Conductive Particlementioning

confidence: 99%

“…To avoid misunderstanding, some restrictions should be specified. In the first place, the size of conductive particles observed in transformers normally ranges from several to hundreds of microns [10, 11]. Although it is realised that micro‐particles with diameter larger than 5 μm are harmful to transformer insulation [10], the diameter larger than 10 μm of them will be paid more attention here due to the following reasons.…”

Section: Introductionmentioning

confidence: 99%

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Review about PD and breakdown induced by conductive particles in an insulating liquid

et al. 2020

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In insulating liquid, a conductive particle becomes charged through the interaction with a conductor exposed to an applied field. Then, it migrates in the action of both electric field and fluid and causes the enhancement of local field when it is in proximity of the conductor with opposite polarity. The enhancement will lead to partial discharge (PD) and may even ignite full gap breakdown in special cases. This study reviews comprehensive researches relevant to these topics. In the first place, several theoretical methods about how to obtain the charges held by a conductive particle with known potential are introduced, so are experimental methods. Then, forces acting on the charged particle in liquid are classified, and its migration characteristics, as well as influential factors, are described. Subsequently, PD and breakdown mechanisms of liquid initiated by conductive particles are presented. The latter involves two cases: electric-field enhancement when the particle concentration is low and bridging phenomenon when it is high. At last, two important, but frequently ignored factors, i.e. dielectric barrier and oil flow, are highlighted, and the authors' suggestions for future work are put forward.

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