Comparative Analysis of Dissolved Gases on 11KV Distribution Transformer: A Case Study of Five Locations in Lagos State

Because all human activity depends on clean, reliable electricity, electrical power is a vital component of life, and issues related to it should not be handled with levity or treated lightly. Inadequate knowledge and improper management of electricity distribution can result in fatalities, electrical accidents, economic loss, downtime, waste of raw materials in industrial processes, machine slowdowns during operation, and disasters (fire outbreak) linked to transformer malfunctions. The goal of this study is to raise awareness of the critical role that transformer oils play in a transformer's useful life and performance, allowing for a longer lifespan and the ability to save time before the transformer wears out. Oil in a transformer serves two major roles which is to insulate and as a coolant. This study used the Doernenburg Ratio Method (DRM), Rogers Ratio Method (RRM), IEC Ratio Method (RRM), and Duval Triangle Method (DTM) to examine the impact of dissolved gas in oil in five specific transformers. Five different areas namely; Auxiliary, Boiler 1-4, Boiler 5, Boiler 6, and Boiler 7 are different locations of transformers used in this study. This investigation clearly shows that thermal decomposition and the Doernenburg Ratio Method (DRM) are likely outcomes from the transformers. Auxiliary, Boiler 1-4, Boiler 5, Boiler 6 and Boiler 7 transformers are susceptible to low thermal temperature, according to the results of the Rogers Ratio Method (RRM). The IEC Ratio Method makes it abundantly plain that there was no expectation of a fault from the Auxiliary, Boiler 1-4, Boiler 5, Boiler 6, and Boiler 7 transformers. Partial discharge and overheating below 2500C are anticipated in all of the transformers under investigation, according to the Duval Triangle Method (DTM). According to International Electro technical Commission (IEC) 60422, it is clear that the transformer insulating oil condition of the investigated transformers is still within tolerable limits based on the water content, breakdown voltage, resistivity, total polychlorinated biphenyl, and flash point measurements made on the extracted oils from the transformers.