NDLI: Investigation on electrical, thermal and mechanical properties of thermally aged pressboard impregnated with mixed mineral oil and synthetic ester fluid

Content Provider	IET Digital Library
Author	Karthikeyan, Amizhtan Somasundaram Mahidhar, Gorla Durga Pawan Sarathi, Ramanujam Taylor, Nathaniel Edin, Hans
Abstract	The proposed study compares the electrical, thermal and mechanical performances of thermally aged cellulose pressboard material impregnated in mineral oil, synthetic ester fluid and mixed oil. The electrical insulation characteristics of oil-impregnated pressboard (OIP) are studied by means of surface discharge inception voltage (SDIV) using an ultra-high frequency technique and surface potential measurement analysis. It indicates that OIP aged in mineral oil has higher surface potential due to higher charge trap density compared to that of the mixed oil and synthetic ester fluid. Mechanical and thermal characteristics of the aged OIP are studied by means of tensile strength measurement and thermo-gravimetric analysis, respectively. The change in the chemical composition of OIP is studied by means of laser-induced breakdown spectroscopy, which indicates lower plasma temperature with mineral oil-based OIP indicating higher degradation state. To further understand the microscopic structure of the thermally aged OIP in different oils, scanning electron microscopy and X-ray diffraction studies have been performed. The pressboard thermally aged in synthetic ester fluid and the mixed oil has better electrical, thermal and mechanical properties as compared with the pressboard aged in mineral oil.
Starting Page	1029
Ending Page	1036
Page Count	8
ISSN	17518822
Volume Number	14
e-ISSN	17518830
Issue Number	Issue 10, Dec (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-smt/14/10
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-smt.2020.0216
Journal	IET Science, Measurement & Technology
Publisher Date	2021-01-08
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Ageing Charge Trap Density Dielectric Breakdown And Discharges Electrical Insulation Characteristic Impregnated Insulation Mechanical Property Mineral Oil-based OIP Mixed Mineral Oil Oil-impregnated Pressboard Organic Insulation Plasma Temperature Power Transformer Insulation Scanning Electron Microscopy Surface Discharge Inception Voltage Surface Discharges Surface Potential Surface Potential Measurement Analysis Synthetic Ester Fluid Tensile Strength Thermal Analysis Thermal Characteristic Thermally Aged Cellulose Pressboard Material Thermally Aged OIP Transformer And Reactors Transformer Oil X-Ray Diffraction
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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