Experimental Investigation of Insulating Properties of Vegetable Oil under High Voltage

Md Farhamdur Reza,Md Mamunur Rashid,Md Selim Hossain,Sanjida Islam

doi:10.24018/ejers.2019.4.1.1047

Md Farhamdur Reza, Md Mamunur Rashid + Show 2 more

Open Access

https://doi.org/10.24018/ejers.2019.4.1.1047

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Abstract

Due to concerns over the world’s energy necessity and environmental impact of mineral oil, these conditions induce many researchers to search for substitute sources for insulating oil. Alternatives insulating oil with biodegradable characteristics, environment friendly and presented in different countries including Bangladesh such as vegetable oils have been proposed for high voltage applications. In this paper, a relative measurement of breakdown voltage through experimental investigation of coconut, mustard, soybean, and palm oil and their blend (which is available in Bangladesh and cost effective) is presented. Break down voltage was measure with different electrode configuration by changing gap distance. The results show that the blend of (50% coconut oil + 50% palm oil) got high breakdown voltage in mushroom-mushroom electrode, and other side in plane-plane type pure soybean oil got high breakdown voltage, compared with transformer oil. The presented result illustrate that the proposed mixed oil provides better performance than the rise husk oil.

Highlights

The transformer plays an important role in providing a reliable and efficient electricity supply and is one of the most critical apparatus’s in electric power transmission and distribution systems [1]
Transformer mineral oil has been substituted by alternative oils such as silicon oil or esters ester oil have high flash point, high relative permittivity than silicon oil
Mushroom Electrode The mushroom electrode which is used in this work, this electrode is fitted in oil tester; it is specially manufactured for measuring breakdown voltage in high voltage operations

Summary

INTRODUCTION

The transformer plays an important role in providing a reliable and efficient electricity supply and is one of the most critical apparatus’s in electric power transmission and distribution systems [1]. The pre-breakdown and breakdown properties at high voltage and large gaps (10cm) in several natural and synthetic esters is presented in [4], and a comparison is made with the well-known mineral transformer oil. The breakdown voltage of rice-husk oil using different electrode and varying gap distance and concluded that pure rice-husk oil can use in low voltage application as a dielectric [9]. It is not effective and it cannot be used for high voltage applications. The Spherical-Spherical (mushroom) and planeplane (type, type and, type3) electrodes with variable gap distance are used for measuring breakdown voltage

EXPERIMENTAL SETUP

Breakdown Voltage Measurement

Electric Field Strength Estimation

Viscosity

Findings

CONCLUSION