Comparison of Statistical Breakdown Voltages in Persea Americana Oil and Mineral Insulation Oil and their Mixtures

Benard Makaa1, George Irungu2 and David Murage3

1,2,3Department of Electrical Engineering and Electronic Engineering, Jomo Kenyatta University of Agriculture and Technology, P.O Box 62000-00200, Nairobi, Kenya Author’s E-mail:1makaa.benard@students.jkuat.ac.ke, 2kimaniirungu@yahoo.com, 3davidkinyua76@gmail.com 1Corresponding Author Email: makaa.benard@students.jkuat.ac.ke

ABSTRACT This paper presents a comparative analysis of the statistical Breakdown Voltage (BDV) in a plant based oil, Persea americana oil (PAO), mineral insulation oil (MIO) and their mixtures. Two types of PAO are tested, that is extra virgin PAO (EVPAO) and refined PAO (RPAO). PAO and MIO and the oil mixtures (namely 50%RPAO + 50%MIO and 50%EVPAO + 50%MIO) are subjected to AC voltages. At least ten tests were carried out for each sample as per IEEE guide for the statistical analysis of electrical insulation breakdown data (IEEE 930 or IEC 62539). The statistical analysis shows that the data for AC breakdown voltages of RPAO, EVPAO, MIO and the oil mixtures obey to the normal distribution law. This is proved using Shapiro-Wilk test, skewness and kurtosis values. It is shown that the average AC breakdown voltage of RPAO is higher than that of MIO. It also observed that AC mean breakdown voltage of RPAO is higher than that of oils mixture (50%RPAO+50%MIO) and MIO. (50%RPAO+50%MIO) BDV is higher than that of MIO. AC mean breakdown voltage of EVPAO and MIO mixture is the lowest one. Thus PAO constitutes a potential liquid for replacing mineral oil in high voltage equipment. Key words: Energy- Breakdown voltage, Statistical analysis, Persea americana oil (PAO), Mineral insulation oil (MIO), PAO/MIO mixtures, Refined Persea americana oil (RPAO).

Cite this article: Makaa, B., Irungu, G., & Murage, D. (2019). Comparison of Statistical Breakdown Voltages in Persea Americana Oil and Mineral Insulation Oil and their Mixtures. European International Journal of Science and Technology, 8(2), 27-36.