DefinePK

Abstract

This paper addresses the effect of the contaminant presence in the power transformer oil. This transformer oil has been used as liquid insulation as well as heat dissipation in high voltage transformer. Recent, researchers have found that ester oil which vegetable-based oil are capable of outshining the disadvantages of mineral oil such as non-biodegradable and future scarcity as a potential replacement as liquid insulation. However, the performance of ester oil is still arguably, especially in DC energization case. In this present paper, bridging experiment has been conducted in order to study the performance of ester oil with the presence of contaminant under the influenced of DC electric field. This approach will show the effect of polarization and Dielectrophoresis (DEP) that create a conduction path between two different potential paths in the electric field and producing motion in the particles. As an effect of DEP, the contaminant tends to move towards the higher region electric field and may lead to a more serious problem, transformer failures. In total, Cellulose particle with two different conditions, i.e. stirred and unstirred were investigated. A complete cellulose bridge is observed between two 13 mm sphere electrodes with 10 mm distance between them. The performance of dielectric properties is analyzed by correlating the formation time and breakdown voltage results.