Investigations on the partial discharge behavior of syntactic foam under uniform field stress

Strauchs, Anja; Mashkin, Andrey; Schnettler, Armin; Podlazly, Jorn; Freiheit-Jensen, Bernd

doi:10.1109/elinsl.2010.5549809

Cited by 6 publications

(4 citation statements)

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“…Strauchs et al reported that the electrical breakdown was initiated by gas discharges inside the hollow sphere in the hollow microsphere under the AC field [18]. Anderson et al also, reported that breakdown strength of glass micro-balloon was higher than conventional gas discharge criterion to the voids, because the deceases of triggering free electrons might reduce the rate of field emission or field ionization events [19][20]. The performance of breakdown of cenosphere/epoxy composites is better than that of silica/epoxy composites.…”

Section: Breakdown Strength and Permittivitymentioning

confidence: 99%

Analysis of AC Breakdown Characteristics of Fly Ash Cenosphere/Epoxy Composite

Seo¹,

Kwon²,

Cha³

et al. 2016

Journal of Electrical Engineering and Technology

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-In this study, AC breakdown properties of cenosphere/epoxy composite are investigated.The thermal properties of the composite are also discussed. The cenosphere/epoxy composites were prepared by epoxy resin filled with 0~40 wt% of hollow fly ash particles (cenospheres). The AC breakdown strength of the composites was measured at 25~125℃. The permittivity, glass transition temperature, and coefficient of thermal linear expansion of the composites were also measured. The experimental results of the cenosphere/epoxy composite were compared with those of the silica/epoxy composite which are widely used as insulating materials in power apparatus. The cenosphere/epoxy composite showed the similar or better performance than silica/epoxy composite in terms of breakdown strength, glass transition temperature, and coefficient of thermal expansion.

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Section: Breakdown Strength and Permittivitymentioning

confidence: 99%

Analysis of AC Breakdown Characteristics of Fly Ash Cenosphere/Epoxy Composite

Seo¹,

Kwon²,

Cha³

et al. 2016

Journal of Electrical Engineering and Technology

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“…In recent years, the application of syntactic foams in the high-voltage field has attracted researchers' attention. Their applications in silicone composite insulators [6], gas-insulated transmission lines (GILs) [7], high-voltage cable terminations [8], superconducting power cables [9], and LN2-based insulation systems [10] have been studied.…”

Section: Introductionmentioning

confidence: 99%

“…Under general operating conditions, the composite crossarm is required to have a service life of not less than 30 years, so the internal insulating dielectric must be able to maintain excellent electrical properties for a long time. The dielectric strength [8][9][10], breakdown process under lightning impulse stress [11], dielectric constant under different levels of humidity [12], and accelerated hydrothermal aging properties [13] of syntactic foams have been studied in earlier papers. However, the existing research was not sufficient to prove that syntactic foams can be applied to composite cross-arms.…”

Section: Introductionmentioning

confidence: 99%

Electrical and Hydrolysis-resistance Properties of Silicone-Modified Resin/Microsphere Syntactic Foam for Composite Cross-arms Insulation Application

Liu

et al. 2021

IEEE Trans. Dielect. Electr. Insul.

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Herein, a type of syntactic foam, consisting of silicone-modified resin and hollow polymer microspheres, is developed and tested for the application of a composite crossarm. The physical properties, electrical properties, and hydrolysis-resistance are tested and analyzed. Suitable microspheres can reduce the density of the syntactic foam to 46.63% of the resin. The dielectric strength of the syntactic foam decreases from 37.9 to 26.1 kV/mm with increasing microsphere content, which is still much higher than the operational requirement of 3 kV/mm. The water-absorption rate (<0.36% after 720 h) and leakage current (<24.17 μA after boiling for 300 h) show that the syntactic foams have excellent penetration resistance and hydrolysis-resistance. In summary, the syntactic foam can be used as the internal insulation material for composite cross-arms and applied to the electrical insulation field.

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“…In different studies, the issue of bubble formation inside the PU foam has been discussed. The formation of the bubbles may lead to partial discharges and probably cause permanent damage to the insulation when they reach a certain threshold [ 14 , 15 ]. Moreover, the pore diameters of the PU foam have been inclusively studied in [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

The Behavior of Polyurethane Foam-Filled Glass-Fiber-Reinforced Polymer Crossarm Subjected to Lightning Transient Voltage

et al. 2021

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The demand for composite materials in high-voltage electrical insulation is escalating over the last decades. In the power system, the composite glass-fiber-reinforced polymer has been used as an alternative to wood and steel crossarm structures due to its superior properties. As a composite, the material is susceptible to multi-aging factors, one of which is the electrical stress caused by continuous and temporary overvoltage. In order to achieve a better insulation performance and higher life expectancy, the distribution of the stresses should firstly be studied and understood. This paper focuses on the simulation work to better understand the stress distribution of the polyurethane foam-filled glass-fiber-reinforced polymer crossarm due to the lightning transient injection. A finite-element-based simulation was carried out to investigate the behavior of the electric field and voltage distribution across the sample using an Ansys Maxwell 3D. Electrical stresses at both outer and inner surfaces of the crossarm during the peak of lightning were analyzed. Analyses on the electric field and potential distribution were performed at different parts of the crossarm and correlated to the physical characteristics and common discharge location observed during the experiment. The results of the electric field on the crossarm indicate that both the outer and internal parts of the crossarm were prone to high field stress.

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Investigations on the partial discharge behavior of syntactic foam under uniform field stress

Cited by 6 publications

References 0 publications

Analysis of AC Breakdown Characteristics of Fly Ash Cenosphere/Epoxy Composite

Analysis of AC Breakdown Characteristics of Fly Ash Cenosphere/Epoxy Composite

Electrical and Hydrolysis-resistance Properties of Silicone-Modified Resin/Microsphere Syntactic Foam for Composite Cross-arms Insulation Application

The Behavior of Polyurethane Foam-Filled Glass-Fiber-Reinforced Polymer Crossarm Subjected to Lightning Transient Voltage

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