Mohamad Nur Aqilah, Azis Norhafiz, Jasni Jasronita, Kadir Mohd Zainal Abidin Ab, Yunus Robiah, Yaakub Zaini
Advanced Lightning, Power and Energy Research Centre (ALPER), Department of Electrical and Electronics Engineering, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia.
Department of Electrical Engineering, Politeknik Mukah, Mukah 96400, Sarawak, Malaysia.
Nanomaterials (Basel). 2021 Mar 19;11(3):786. doi: 10.3390/nano11030786.
This experimental study aims to examine the partial discharge (PD) properties of palm oil and coconut oil (CO) based aluminum oxide (AlO) nanofluids with and without surfactants. The type of surfactant used in this study was sodium dodecyl sulfate (SDS). The volume concentrations range of AlO 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. AlO 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 AlO 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 AlO. 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.
本实验研究旨在考察添加和不添加表面活性剂的情况下，基于棕榈油和椰子油（CO）的氧化铝（AlO）纳米流体的局部放电（PD）特性。本研究中使用的表面活性剂类型为十二烷基硫酸钠（SDS）。分散在油样中的AlO的体积浓度范围为0.001%至0.05%。表面活性剂与纳米颗粒的比例设定为1:2。总共测量了两种不同类型的精炼、漂白和脱臭棕榈油（RBDPO）以及一种CO的局部放电情况。还对矿物油（MO）进行了测量以作比较。所有样品的局部放电起始电压（PDIV）测量基于升压法，本研究中选用了间隙距离为50mm的针 - 球电极配置。AlO提高了RBDPO、CO和MO的PDIV，其中PDIV的最高提高幅度分别为34%、39.3%和27%。RBDPO的局部放电幅度和重复率分别提高了38%和81%，而对于CO，其局部放电幅度和重复率分别可提高至65%和80%。无论有无SDS，MO的局部放电幅度和重复率的提高分别为18%和95%。在没有SDS的情况下，AlO的存在会使RBDPOA、RBDPOB和CO的光信号平均发射量分别降低26%、75%和65%，同时局部放电特性得到改善，但在相同体积浓度的AlO下，这两个情况并不相关。另一方面，随着SDS的引入，油的光信号平均发射水平增加。无论有无SDS，MO中的光信号发射与局部放电特性的改善均不相关。
