COMPARATIVE STUDY OF GAS-TO-LIQUID (GTL) OIL AND MINERAL OIL AS A HIGH VOLTAGE LIQUID INSULATION

• Main Author: Daniel Sorimuda Ritonga, Alvin
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/50345
• Institution: Institut Teknologi Bandung

Mineral oil has been used for over 100 years as an insulating liquid and cooling agents for high voltage transformer. Nowadays, Gas-to-liquid (GTL) has been introduced as insulating liquid to provide a better performance over conventional mineral oil. A method has been developed to manufacture hydrocarbon insulating oils from natural gas (methane) that are purer and hence could provide better performance over conventional mineral oils This research investigated the performance of GTL based oil compared to mineral oil under accelerated thermal aging. Samples were conditioned to the same initial conditions through the heating at a temperature of 100°C for 24 hours. Mineral oil samples with volume of 850 ml and 72 gram copper strip covered with insulating kraft paper were put in bottles with rubber seal. The accelerated thermal aging was conducted in two oven with two variations of temperature 120 and 150 for about 1344 hours. Sample were taken every two weeks (336 hours) and put into various test and measurements. To analyse oil performance, measurement on breakdown voltage, resistivity, relative permittivity, dielectric losses (tan ?) and acidity has taken place. Physical properties of oil showed through interfacial tension (IFT) test and color scale test. UV-visible also used to investigate to monitor oil degradation through accelerated thermal aging and the result showed that oil degradation increased through thermal aging. On the other hand, in order to analyse paper degradation, measurement on moisture, degree of polymerization, physical analysis through visual inspection and optical microscope, scanning electron microscope (SEM), Energy Dispersive X-ray Spectroscopy (EDX), X-ray diffraction (XRD), and also thermal stability analysis through thermogravimetric analysis (TGA), differential thermal analysis (DTA), dan derivative thermogravimetric analysis (DTG) has taken place.