Browsing by Author "Egodage, D"

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    item: Conference-Abstract
    Identifying better fitting function for asymmetric differential thermo gravimetric signal analysis
    Dodampola, R; Egodage, D; Amarasinghe, S; Attygalle, D; Weragoda, S; Perera, T
    Thermogravimetric analysis is one of the main technique used in solid state reaction kinetics studies. Unlike in gaseous and liquids state reactions, most solid-state reaction mechanisms are complex and comprise of simultaneous reactions. Curve fitting is one of the most used tool to obtain kinetic parameters such as activation energy and preexponential factor despite the reaction mechanism. Diferential Thermo Gravimetric (DTG) signals are asymmetric and its asymmetry depends on the kinetic triplet. Therefore, the use of symmetric functions such as Gaussian and Lorentzian to fit asymmetric DTG signals infer errors. To avoid that a new curve fitting method has been introduced in this study.
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    item: Conference-Full-text
    Investigation of plasticizer evaporation of local electrical cable insulations
    (IEEE, 2018-05) Egodage, D; Dodampola, R; Weragoda, S; Amarasinghe, DAS; Attygalle, D; Chathuranga, D
    Though insulation is critical to the performance of an electrical cable the assessment of the status of an insulation is still a major challenge. Since the root cause of most electrical cable failures is due to insulation deterioration, if the rate of aging can be predicted, properly scheduled, appropriate maintenance programs can nearly eliminate cable failures. The kinetics of plasticizer evaporation of polyvinyl chloride based locally manufactured electrical cable insulations were investigated. Plasticizer evaporation is a slow process under low temperatures and would take years to study under such conditions. Therefore, accelerated conditions were used to get readings within the limited timeframe. Nevertheless, data obtained under accelerated conditions was mapped to normal conditions through Arrhenius approach. Deconvoluted derivative thermograms were used to identify the initial plasticizer percentages and Arrhenius approach was used to map accelerated condition measurements to ambient temperature evaporation rates.