A5069847139- High voltage insulation and dielectric phenomena
- Dielectric materials and actuators
- Advanced Sensor and Energy Harvesting Materials
- Power Transformer Diagnostics and Insulation
- Numerical methods in engineering
- Epoxy Resin Curing Processes
- Smart Materials for Construction
- Aerosol Filtration and Electrostatic Precipitation
- Building materials and conservation
- Structural Analysis of Composite Materials
- Mechanical Behavior of Composites
- Facilities and Workplace Management
Nanyang Technological University
2022-2023
Institute of High Performance Computing
2023
Agency for Science, Technology and Research
2023
Electrical treeing is a leading cause of the eventual breakdown dielectric polymers under high voltages. This paper presents simulation scheme developed based on phase-field regularized cohesive zone model (PF-CZM) for electrical tree modelling. By using analog crack propagation, localized modelled by evolution surface energy, and driven competition between energy stored following laws thermodynamics. The microscopic Weibull distribution strength key factor resulting in fractal structures...
Insulation failure of composite epoxy insulation materials in distribution switchgear under the stress heat and humidity is one leading causes damage to components. This work prepared by casting curing a diglycidyl ether bisphenol A (DGEBA)/anhydride/wollastonite system, performed material accelerated aging experiments three conditions: 75 °C 95% relative (RH), 85 RH, 95 RH. Material, mechanical, thermal, chemical, microstructural properties were investigated. Based on IEC 60216-2 standard...
In this study, we conducted the hygrothermal aging of an epoxy composite insulation material at 95% relative humidity (RH) and temperatures 95 °C, 85 75 °C. We measured electrical properties, including volume resistivity, permittivity, dielectric loss, breakdown strength. It was found to be impossible estimate a lifetime based on IEC 60216 standard, because it uses strength as its criterion even though hardly changes in response aging. analyzing variations loss with time, that significant...
Dielectric breakdown of electrical insulations under high-voltage conditions can cause damage to electronics and equipment, resulting in property losses. To investigate the behaviour dielectric polymers, a simulation method is proposed this paper. A maximum electric field intensity criterion was integrated with Maxwell's equations. Gaussian distribution function coupled illustrate stochasticity strength. factor differentiate intact material, whose local properties were modified according...
Epoxy resin is widely employed as a polymeric insulation material. Epoxy/amine type of that crosslinked by amine groups, exhibiting improved mechanical properties, better durability, and easier curing process. However thermal degradation concern the material prone to heat accumulation during long-term use. Thus, this study aims investigate effects aging on dielectric properties epoxy/amine resin, along with associated molecule change. Specimens were prepared thermally aged at 105°C for...
With the development of nanotechnology, nanocomposites have gained more attention for their increased dielectric breakdown strength and potential to improve reliability electrical equipment. However, there is still a lack physics-based numerical methods study mechanism nanocomposite. In this paper, we present novel phase-field model that utilizes similarity between fracture breakdown. The employs variable, ranging from 0 1, characterize damage driven by competition surface energy stored...
The electrical properties of epoxy resin after hygrothermal aging were studied. volume resistivity, dielectric loss, permittivity, and breakdown strength measured for samples aged at 95 °C a relative humidity % 180 h, 420 660 1000 h. It was found that the resistivity decreases with time by an order magnitude loss permittivity significantly increase in low-frequency range. However, AC is not changed aging. A comparison made another group without moisture control. Through FTIR (Fourier...
In tropical environments, the aging of electrical insulation materials is susceptible to high humidity environment. This work investigates effect relative (RH) on thermal Diglycidyl Ether Bisphenol A (DGEBA)/Anhydride/Wollastonite composite epoxy material. The test at 95°C without control finds that this material exhibited exceptional resistance aging. On other hand, significantly accelerated degradation via adsorbed water molecules attack ester bonds resin matrix, resulting in hydrolysis...