A new operational characteristic for diagnosing the healthy and faulty currents of power transformers

The inrush currents of transformers are among the main causes which compromise performance protection relays in practice. Therefore, discrimination between and faults is very important. A new technique proposed this paper to distinguish internal fault other normal transient conditions (such as current). Accordingly, a operational characteristic defined for feature extraction classification instantaneous current behavior based on modal transform. accurately rapidly discriminated from load switching, currents) by tracking differential curve. Furthermore, real transformer simulated validate method PSCAD-EMTDC MATLAB software. data actual Iranian power network studied. simulation results show stability, reliability, simplicity, high speed current. compared with its intelligent counterparts confirm clear improvement.