Study of Thermallay accelerated aging of Transformer Insulation Paper in Mineral Oil and Gas-to-Liquid Dielectrics using Scanning Electron Microscopy (SEM), Thermogravimetric Analysis (TGA) and X-ray Diffraction (XRD)

This paper reports novel comparative study results on the degradation of kraft paper immersed in mineral oil and gas-to-liquid dielectrics under accelerated aging at 120°C and 150°C for duration up to 1344 hours in a controllable oven. Tensile strength and degree of polymerization (DP)v of paper sam...

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Bibliographic Details
Published in:International Journal on Electrical Engineering and Informatics 2021-09, Vol.13 (3), p.695-716
Main Authors: Ritonga, Alvin, Suwarno, Suwarno
Format: Article
Language:English
Subjects:
Aging
Cellulose
Chemical elements
Comparative studies
Crystal structure
Crystallinity
Degradation
Degree of polymerization
Diameters
Dielectric strength
Fischer-Tropsch process
Globules
Hydrocarbons
Insulation
Mineral oils
Polymerization
Scanning electron microscopy
Spectrum analysis
Stability analysis
Tensile strength
Thermal stability
Thermogravimetric analysis
X-ray diffraction
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Summary:This paper reports novel comparative study results on the degradation of kraft paper immersed in mineral oil and gas-to-liquid dielectrics under accelerated aging at 120°C and 150°C for duration up to 1344 hours in a controllable oven. Tensile strength and degree of polymerization (DP)v of paper samples before and after aging were measured. Morphological changes were observed using SEM (scanning electron microscope). Degradation of cellulose from kraft paper including its crystallinity change was investigated through EDX (x-ray diffraction) analysis. Thermogravimetric (TG) analysis was used to study the thermal stability of the paper samples aged in the dielectrics. Experimental results showed that DP, and tensile strength of kraft paper decreased with aging. SEM observation indicated that micro globules detected in the aged paper sample and the diameter of micro globules increased with aging time and temperature. The EDX analysis showed that there were increase of crystallinity of aged paper samples. TG analysis showed that higher mass loss was found in aged samples compared to those new one. The initial decomposition temperature slightly reduced with aging time and temperature.
ISSN:2085-6830
2087-5886
DOI:10.15676/ijeei.2021.13.3.12