Transformer fault detection apparatus and method

A transformer fault detection apparatus, comprising:

• an integrated sensor unit for sensing signals through a plurality of sensors located on each of an upper drain valve and a lower drain valve present in a transformer;
• a first possible discharge area calculation unit for calculating a first possible discharge area estimated to be a location of a partial discharge source of the transformer, based on arrival times of signals sensed by different sensors located on the upper drain valve;
• a second possible discharge area calculation unit for calculating a second possible discharge area estimated to be the location of the partial discharge source of the transformer, based on arrival times of signals sensed by different sensors located on the lower drain valve;
• and
• a final possible discharge area calculation unit for calculating a final possible discharge area estimated to be the location of the partial discharge source of the transformer, based on an overlapping area between the first possible discharge area and the second possible discharge area.