• Mohammad Aslam Ansari

Transformer is a very important asset in a electrical power network. Its reliable and continuous operation is the key to profitable generation, transmission and distribution of electric power. Failure of a large transformer not only results in the interruption of supply of electricity to the consumers but also it can cause serious damage to other ancillaries in the power system which in turn may result in significant loss of revenue to the electric utility. Replacement or the maintenance of that transformer can take up to days or years if the failure is not disastrous. It is said that life of a transformer is the life of its insulation of which transformer oil is the main ingredient. It is like a blood in the human body, and acts as insulating agent and coolant. During the operation of transformer, the oil insulation is subjected to various stresses like thermal stress, and electrical stress, resulting in degradation of its health which may defeat its purpose. This necessitates its health monitoring and timely reclamation and/ or replacement. From years ago, researchers have been working on various kinds of intrusive and non-intrusive techniques to assess and the health condition of the mineral oil. In this paper, a thorough survey is done on health diagnostic techniques applied to transformer oil. Various methods are studied regarding different viewpoints in this literature. Finally, a couple of thorough comparison is made between the available techniques considering the nature, capabilities, advantages and limitations.

Transformer Oil, Diagnostics, Intelligent Techniques,

"An Overview of Health Diagnostic Techniques Applied to In-Service Transformer Oil", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.1, Issue 1, page no.688-693, January-2014, Available :http://www.jetir.org/papers/JETIR1901B90.pdf

"An Overview of Health Diagnostic Techniques Applied to In-Service Transformer Oil", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.1, Issue 1, page no. pp688-693, January-2014, Available at : http://www.jetir.org/papers/JETIR1901B90.pdf