Abstract
This paper presents a high temperature ageing study of refined, bleached, and deodorized palm oil (RBDPO) olein at 170 ◦C in the presence of air. In total, two types of RBDPO were examined. The physiochemical and dielectric properties of RBDPO were measured and analysed. We found that the moisture and viscosities for both RBDPO increased as the ageing progressed, whereas the acidities fluctuated at very low levels at less than 0.005 mg KOH/g. The ageing on the AC breakdown voltages of both RBDPO were not affected throughout the ageing processes. The dielectric dissipation factors and relative permittivities for both RBDPO increased as the resistivities decreased with the ageing time.
Highlights
Palm oil (PO) has been identified as possible insulating fluid for transformer applications
The fatty acid composition for both RBDPO were determined via gas chromatography analysis according to the Malaysian palm oil board (MPOB) test methods p3.4:2004 and p3.5:2204, as shown in Table 1 [26]
The moisture for both RBDPO slightly decreased with ageing up to 14 days and and subsequently increased as the ageing progressed
Summary
Palm oil (PO) has been identified as possible insulating fluid for transformer applications. Previous studies revealed that the electrical and physiochemical properties of new PO are close to other types of natural esters and mineral oil (MO) [3,4,5,6]. The majority of these properties are comparable to other types of vegetable oils under ageing at temperatures ranging from 85 to 150 ◦ C, which are maintained at acceptable levels according to standards [7,8,9,10,11]. One of the main purposes of high temperature ageing is to examine the performance of vegetable oils under extreme conditions where the influences of oxygen and moisture are considered [12,13]
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