Study of extra virgin olive oil as liquid insulation in transformer

Abstract

Mineral oil, which is the basis of petroleum, has long been used as an insulating and cooling medium for transformers. In fact the petroleum has a limited supply, over time it will run out, cannot be renewed, even petroleum is poisonous, cannot be decomposed. In this study, researchers used vegetable oil that is renewable, biodegradable, and safe for living things and the environment, namely olive oil with good quality, from the first pressed of olives, which is called extra virgin olive oil to be applied to transformers as an insulating and cooling medium. To determine the feasibility of using extra virgin olive oil as transformer oil, the test is to determine the value of the breakdown voltage. Breakdown voltage is the voltage value when the transformer components become connected because oil cannot perform its function as insulation. Tests carried out according to international standards IEC 156, 296 and SPLN 49-1. The breakdown voltage value at room temperature (28 °C) is 46.73 kV, at a temperature of 50 °C where the transformer operates is 48.31 kV. At a temperature of 50 °C the breakdown voltage value is higher due to heating which causes water content, air bubbles, and voids to be reduced.

Influence of thermal aging on dielectric characteristics of transformer insulating oils

“…The average value of electric field intensity during sparkover, denoted as 𝐸 𝑆𝑂,63.2% , is determined by multiplying the value of VSO,63.2% by the analytical mean value of electric field intensity, E1kV,MEAN, derived from FEM analysis when a 1 kV potential is applied to the left electrode. The relationships among 𝐸 𝑆𝑂,63.2% , 𝑉 𝑆𝑂,63.2% , and 𝐸 1𝑘𝑉,𝑀𝐸𝐴𝑁 are mathematically expressed as follows [11,12]: 𝐸 𝑆𝑂,63.2% = 𝐸 1𝑘𝑉,𝑀𝐸𝐴𝑁 × 𝑉 𝑆𝑂 (1) In equation ( 1), 𝑉 𝑆𝑂 either there are no units or its units are contingent on the Poisson equation, which correlates the voltage of the electrode system with the charge density within the volume. This analysis offers crucial insights into the interplay between electric field intensity and breakdown voltage within the studied system.…”

“…Transformer oil is essential for the safe operation of electrical transformers due to the fact that it provides both an insulator and a coolant [1]. Its ability to withstand breakdown voltages is critical for ensuring the electrical insulation of the transformer's durability.…”

The HASEL actuator’s muscle mimicking mechanism for enacting an upper limb smart prosthesis: A review on recent progress and challenges for future implementation

“…They possess a unique set of dielectric properties. For an example, at room temperature, the olive oil's breakdown voltage is 60kV/2.5mm [34] with a dynamic viscosity of 69 cP [35] and relative permittivity of 3.065 [36]. On the other hand, as per IEC standard, the acceptance value of field transformer oils' breakdown voltage is 30 kV/2.5mm [37].…”

Effect of ferrofluid magnetization on transformer temperature rise

“…However, the increasing environmental and economical demands call for the replacement of the mineral transformer oil with progressive eco-friendlier liquid media of enhanced heat transfer efficiency [4]. Among various alternatives, plant-based insulating fluids are being considered to fulfill the environmental requirements [5,6]. Another approach relies on the implementation of nanotechnology to improve thermal and dielectric characteristics of the existing insulating oils by dispersing suitable nanoparticles [7].…”