Abstract
This experimental study aims to examine the partial discharge (PD) properties of palm oil and coconut oil (CO) based aluminum oxide (Al2O3) nanofluids with and without surfactants. The type of surfactant used in this study was sodium dodecyl sulfate (SDS). The volume concentrations range of Al2O3 dispersed in oil samples was varied from 0.001% to 0.05%. The ratio of surfactants to nanoparticles was set to 1:2. In total, two different types of refined, bleached and deodorized palm oil (RBDPO) and one type of CO were measured for PD. Mineral oil (MO) was also examined for comparison purpose. PDIV measurements for all samples were carried out based on rising voltage method whereby a needle-sphere electrode configuration with a gap distance of 50 mm was chosen in this study. Al2O3 improves the PDIVs of RBDPO, CO and MO whereby the highest improvements of PDIVs are 34%, 39.3% and 27%. The PD amplitude and repetition rate of RBDPO improve by 38% and 81% while for CO, it can increase up to 65% and 80% respectively. The improvement of PD amplitude and repetition rate for MO are 18% and 95%, regardless with and without SDS. Without SDS, the presence of Al2O3 could cause 26%, 75% and 65% reductions of the average emission of light signals for RBDPOA, RBDPOB and CO with the improvement of PD characteristics but both events do not correlate at the same volume concentration of Al2O3. On the other hand, the average emission of light signal levels of the oils increases with the introduction of SDS. The emission of light signal in MO does not correlate with the PD characteristics improvement either with or without SDS.
Highlights
The partial discharge inception voltage (PDIV) and partial discharge (PD) activities generated by needle-sphere electrode configuration under
With sodium dodecyl sulfate (SDS), the PD amplitude and repetition rate of RBDPO improve by 38% and 80% while for coconut oil (CO), it can be enhanced up to 65% and 80%, respectively
Decrease by 26%, 75% and 65% with the improvement of PD characteristics, but both events do not correlate at the same volume concentration of Al2 O3
Summary
Partial discharge (PD) is an event that exists in dielectric fluid or solid insulations. PD occurs due to the inappropriate design, defect in manufacturing and contaminations either from internal or external sources. PD is usually initiated at conductordielectric interfaces within solid or dielectric insulating fluids, bubbles within insulation fluids and particle contaminants in insulation fluids. Materials defect could enhance local electric field and lead to the inception of PD [1,2]. Once the discharge is initiated, it can accelerate the degradation of insulation materials, allowing its propagation from local areas into bulk oils, leading to breakdowns [3]. The discharge induced insulation failures develop from discharge inception to breakdown depends on the location of the local field
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