Electrical tree propagation along barrier-interfaces in epoxy resin

Vogelsang, R.; Brütsch, R.; Farr, T.; Fröhlich, K.

doi:10.1109/ceidp.2002.1048953

Cited by 25 publications

(11 citation statements)

References 6 publications

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“…While previous investigations indicate that the tree spreads tangential to the barrier surface [44], the breakdown channels stop propagating after having reached the barrier. Instead, the channels between the needle tip and the barrier surface begin to widen.…”

Section: Temporal Evolution and Retardation Of Tree Propagationmentioning

confidence: 97%

Retardation of electrical tree propagation by resin degradation

Weiers¹,

Keller²,

Hutter

et al. 2006

Int Trans Elec Energy Syst

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SUMMARYIn order to improve insight into the effect of delaminations between the conductor and the groundwall insulation on the ageing of high voltage rotating machinery insulation, the influence of the polymer degradation on tree growth has been studied. Simultaneous partial discharge measurements and photograhic observations have been conducted in order to investigate the effect of the degradation of the resin on electrical tree propagation. The photographic observation indicates that the degradation of the resin retards the tree propagation after the tree having failed to penetrate a mica barrier. As the resin is degraded and in part rendered conducting, the partial discharges change both in magnitude and in terms of phase resolved partial discharge patterns. These partial discharge measurements are promising to improve insight into the processes involved in winding insulation ageing, when photographic observations are unattainable. Moreover the differences found between various resins offer an explanation why various types of winding insulation have been found to differ in their capability to withstand thermal cyclic ageing.

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Section: Temporal Evolution and Retardation Of Tree Propagationmentioning

confidence: 97%

Retardation of electrical tree propagation by resin degradation

Weiers¹,

Keller²,

Hutter

et al. 2006

Int Trans Elec Energy Syst

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“…high voltage polymeric cables) [6][7][8]. The tree growth mechanism was divided into three processes: (1) the incubation process, (2) the initiation process, and (3)the propagation process [9].…”

Section: Introductionmentioning

confidence: 99%

Long-term AC Electrical Treeing Behaviors of Epoxy/Layered Silicate Nanocomposites Prepared by a 3-Roll Mill

Park

2012

Transactions on Electrical and Electronic Materials

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Studies on the effects of layered silicate content on the AC electrical treeing and breakdown behaviors of epoxy/ layered silicate nanocomposites were carried out in needle-plate electrode geometry. Wide-angle X-ray diffraction (WAXD) analysis and transmission electron microscopy (TEM) observation showed that 1 wt% of the multilayered silicate was fully exfoliated into nano-sized monolayers in the epoxy matrix however, over 3 wt% of the silicate was in an intercalated state. When 1 wt% layered silicates were incorporated, an electrical tree was initiated in 439 min and propagated at a speed of 2.3 μm/min after applying 781.4 kV/mm, representing a decreased in starting initiation time by a factor of 11.0 and increase in propagation speed by a factor 8.2 in comparison with neat epoxy resin. These values were in great decline after the layered silicate content was increased to 3wt% which implies that the exfoliated silicate blocked the tree initiation and propagation processes effectively. However the effect was largely decreased in the intercalated state.

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“…high voltage polymeric cables) [12][13][14]. The tree growth mechanism is divided into three processes: (1) incubation process, (2) initiation process, and (3) propaga-tion process [15].…”

Section: Introductionmentioning

confidence: 99%

Effect of Amino Silane Coupling Agent on the AC Electrical Breakdown Phenomena of Epoxy/Layered Silicate Nanocomposite in Needle-plate Electrodes

Park

2012

Transactions on Electrical and Electronic Materials

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The effects of amino silane coupling agent on the AC electrical treeing and breakdown behaviors in an epoxy/layered silicate (1 wt%) were examined in needle-plate electrode geometry. A layered silicate was exfoliated in an epoxy base resin by using our AC electric field apparatus. To measure the tree initiation and propagation and the breakdown rate, an alternating current (AC) of 10 kV (60 Hz) was applied to the specimen in needle-plate electrode arrangement with a 30℃ insulating oil bath. In the epoxy/amino silane system, the tree initiation time was 11.5 times higher and the breakdown time was 17.9 times higher than those of the neat epoxy resin. The tree initiation time in the epoxy/layered silicate (1 wt%) system with the amino silane was 2.0 times higher, and the breakdown time was 1.5 times higher than those of the epoxy/layered silicate (1 wt%) system.

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Electrical tree propagation along barrier-interfaces in epoxy resin

Cited by 25 publications

References 6 publications

Retardation of electrical tree propagation by resin degradation

Retardation of electrical tree propagation by resin degradation

Long-term AC Electrical Treeing Behaviors of Epoxy/Layered Silicate Nanocomposites Prepared by a 3-Roll Mill

Effect of Amino Silane Coupling Agent on the AC Electrical Breakdown Phenomena of Epoxy/Layered Silicate Nanocomposite in Needle-plate Electrodes

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