Improving Reliability of Transformer through Continuous DGA Monitoring : A 25 MVA Power Transformer Case Study

The Power Transformer is a very important element and one of the costliest equipment in the Power system. Both non-availability and replacement cost can have potential effect in the financial decision of the organization. Especially at Hydro Power Station, availability of transformer during peak inflow season is of paramount importance. During lean season, the transformer can be taken out of service and maintenance can be done without incurring any direct business loss as fewer units can be run with the available inflow of water. This paper deals with the improvement of reliability of power transformer through continuous DGA monitoring until a planned outage is allowed.