Comparative Study Of Moisture Reduction Technique In Mineral Oil

Ah Chun, Alary Benedo (2018) Comparative Study Of Moisture Reduction Technique In Mineral Oil. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The uses of the transformer are important for generation, distribution and transmission of the electrical system network.High dielectric strength and cooling performance of its insulating oil are properties that the transformer depends on in order to maintain normal operation.Several factors affected the dielectric insulation problem is moisture,acidity,pressure and suspended particle.0.01% presence of moisture in the transformer oil can decrease 20% of the breakdown voltage of the oil.Thus,this project is focusing on reducing the moisture content in the mineral oil which results in improvement of the breakdown voltage.Three techniques of moisture reduction have been used which are Vacuum Oven (VO) technique,Nitrogen Saturated (NS) technique,and Molecular Sieves (MS) technique.The performance of breakdown voltage (BDV) and amount of moisture reduce are measured to determine the most effective technique.Karl Fischer Coulometric (KFC) complies with ASTM D1533 standard is used meanwhile for breakdown voltage (BDV) Megger OTA60PB follows the standard ASTM D1816.The analysis of experimental data shows among VO,NS,and MS techniques,the MS no filer techniques has 82.33% reduction of moisture content but BDV has not been tested due to MS particle will effect the BDV test.But,NS has 80.79% moisture reduction which has increased the BDV of mineral oil with enhancement 150%.The low moisture content value by the NS because theoretically when nitrogen gas saturated in mineral oil, the nitrogen gas replaced the dissolved oxygen in the oil.The result is an enhancement of the performance of the mineral oil.MS with a smaller pore size (0.22μm) has a better result than VO and (MS) bigger pore size (1μm) because the smaller pore size has filtered the moisture from re-dissolving with the good oil.Overall,NS technique has proven the most effective technique throughout the experiment and the best solution to reduce moisture from the mineral oil.

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