Biodegradable dielectric liquids for transformer applications

Summary form only given. Mineral oil, which is a derivative of petroleum crude, is used in transformers, capacitors, switchgears and in circuit breaker from the beginning. The Polychlorinated biphenyls were introduced as non-flammable, high chemical stability synthetic liquids for transformers, capacitors, and for switchgear. The worldwide depletion of petroleum crudes and alternative to Polychlorinated biphenyls has stimulated the pattern of research and evaluation of hydrocarbons, esters both natural and synthetic in respect of characteristics to suit electrical applications. A number of synthetic dielectric liquids such as silicone oil, organic esters and aromatic hydrocarbons in place of PCB´s were developed and are being used in a variety of electrical applications because of their fire-resistance, thermal stability & high dielectric behavior. It is very essential to use such biodegradable, non-toxic dielectric fluids for transformer applications. Not only it is important for a dielectric fluid to be biodegradable, but also it should not pollute the ecosystem by giving out any hazardous materials. When transformers located close proximity to the rivers, canals, sewage treatment work spots, high rise buildings, hospitals and educational institutions, risk is minimized my using fire resistant, biodegradable, non-toxic dielectric fluids. This ensures that the ecosystem is clean, free from toxic contaminant for the better life. CPRI has undertaken research work on these areas to cater to the needs for the Indian systems.