Barrier effect of treeing in composite insulating materials with heat-adhesive interfaces of different polymers

Uehara, Hiroaki; Kudo, Kazutoshi

doi:10.1109/tdei.2005.1561807

Cited by 17 publications

(15 citation statements)

References 5 publications

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“…5(c), the simulated tree is completely stopped by the barrier. This tendency can be observed in actual tree experiments with the heat-adhesive interface perpendicular to the electric force line in composite insulating materials [9]. Figure 6 shows cross sections of simulated tree patterns located 3 pixels from the barrier top when the barrier is located between z-coordinates of z=30 and z=32 with an interface perpendicular to the electric force line for various V d .…”

Section: A Simulated Tree Patterns With An Interface Perpendicular Tmentioning

confidence: 61%

Three-dimensional tree simulation of composite system considering an interface perpendicular or parallel to the electric force line

Uehara

Fujimoto

Nanba

et al. 2009

2009 IEEE Conference on Electrical Insulation and Dielectric Phenomena

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We carried out a three-dimensional tree simulation of a composite system with an interface perpendicular or parallel to the electric force line based on a dielectric breakdown model (DBM) considering the growth probability. It was found that an interface perpendicular to the electric force line exhibits a positive barrier effect and that an interface parallel to the electric force line exhibits a negative barrier effect.

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Section: A Simulated Tree Patterns With An Interface Perpendicular Tmentioning

confidence: 61%

Three-dimensional tree simulation of composite system considering an interface perpendicular or parallel to the electric force line

Uehara

Fujimoto

Nanba

et al. 2009

2009 IEEE Conference on Electrical Insulation and Dielectric Phenomena

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“…The tree did not bypass the barrier even when the voltage was applied for 200 minutes [16]. However, bypassing of the barrier could occur if the same voltage was applied for longer than 200 minutes, or if a higher voltage was applied.…”

Section: Resultsmentioning

confidence: 95%

“…Figure 4 illustrates tree propagation in EVA with a PP film inserted. In this case, the tree penetrated the barrier after creeping on the barrier surface for about 50 minutes [16].…”

Section: Resultsmentioning

confidence: 99%

“…Hence, we enlarged the grid size. In addition, the formation of an air layer observed at the interface in the case of actual tree propagation is irregular and incomplete when the tree reaches the barrier surface [16]. In this study, we assumed that an air layer already existed on the barrier surface from the beginning of tree propagation.…”

Section: Simulation Methodsmentioning

confidence: 99%

“…In the experiments with a polymer/polymer interface, the data were measured only for 200 minutes of voltage application [16], and hence the phenomenon of bypassing the barrier was not observed. However, we may assume that this phenomenon can be observed experimentally under more severe conditions, such as in the case of a constant voltage applied longer than 200 minutes, or in the case of a ramp voltage.…”

Section: Tree Shapes On Interfacementioning

confidence: 99%

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Three‐dimensional tree simulation utilizing a three‐layer model

Uehara

Kudo

2009

Electrical Engineering Japan

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SUMMARYRecently, polymer/polymer composite insulating systems have been widely used in high-voltage equipment and power cables. Such composite insulating systems always have an interface between two polymeric insulating materials. This interface may cause partial discharge and electrical treeing under high electric stresses. The electrical properties of this polymer/polymer interface have not yet been fully understood. It has been shown that the propagation characteristics of electrical trees in polymer/polymer composite insulating materials considerably vary depending on the combination of polymers. It has also been shown that a cavity or a thin gas layer generates near the polymer barrier molded in the base polymer, by the pressure of decomposing gas occurring in the tree channels during AC tree extension.In this study, we will investigate the three-dimensional simulated tree utilizing a three-layer model considering a thin gas layer on a barrier based on a DBM model with growth probability.The results show that the critical fields of air layer are related to the easiness of tree propagation in the air layer. Moreover, it is suggested that the three-layer model is more effective than the two-layer model when the tree propagation is discussed in detail.

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Effect of biaxial orientation on dielectric and breakdown properties of poly(ethylene terephthalate)/poly(vinylidene fluoride‐co‐tetrafluoroethylene) multilayer films

Carr

Mackey

Flandin

et al. 2013

J Polym Sci B Polym Phys

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Polymer films with enhanced dielectric and breakdown properties are essential for the production of high energy density polymer film capacitors. By capitalizing on the synergistic effects of forced assembly nanolayer coextrusion and biaxial orientation, polymer multilayer films using poly(ethylene terephthalate) (PET) and a poly(vinylidene fluoride-cotetrafluoroethylene) [P(VDF-TFE)] copolymer were produced. These films exhibited breakdown fields, under a divergent field using needle/plane electrodes, as high as 1000 kV mm 21 . The energy densities of these same materials, under a uniform electric field measured using plane/plane electrodes, were as high as 16 J cm 23 . The confined morphologies of both PET and P(VDF-TFE) were correlated to the observed breakdown properties and damage zones. On-edge P(VDF-TFE) crystals induced from solid-state biaxial stretching enhanced the effec-tive P(VDF-TFE) layer dielectric constant and therefore increased the dielectric contrast between the PET and P(VDF-TFE) layers. This resulted in additional charge buildup at the layer interface producing larger tree diameters and branches and ultimately increasing the breakdown and energy storage properties. In addition to energy storage and breakdown properties, the hysteresis behavior of these materials was also evaluated. By varying the morphology of the P(VDF-TFE) layer, the low-field dielectric loss (or ion migration behavior) could be manipulated, which in turn also changed the observed hysteresis behavior.

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Barrier effect of treeing in composite insulating materials with heat-adhesive interfaces of different polymers

Cited by 17 publications

References 5 publications

Three-dimensional tree simulation of composite system considering an interface perpendicular or parallel to the electric force line

Three-dimensional tree simulation of composite system considering an interface perpendicular or parallel to the electric force line

Three‐dimensional tree simulation utilizing a three‐layer model

Effect of biaxial orientation on dielectric and breakdown properties of poly(ethylene terephthalate)/poly(vinylidene fluoride‐co‐tetrafluoroethylene) multilayer films

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