Improvement in polarization index of transformer by using six sigma methodology

Transformer is an important electrical device in the power system which is used to step up and step down the voltage & Transfer electrical power according the need of customer. Oil filled Transformers get the insulation and heat transfer properties form the oil. But ironically the same oil causes one of the major defects of the transformer i.e. moisture. The transformer there is always mechanical, thermal or electrical stress generated during its operational period , it causes fault in transformer, the source of fault may lie in design, manufacturing, material used, handling & site , as this is the major pain area for all transformer industries , we introduced a latest quality tool to resolve this repetitive problem with target to reduce it at 0.01 DPU level ,In this paper we used six sigma methodology & approach, this is statistical tool which is based on past data, process parameter , results and analysis of the problem .