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Design, implementation and testing of a microprocessor-based high-speed relay for detecting transformer winding faults

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4 Author(s)
Sidhu, T.S. ; Power Syst. Res. Group Saskatchewan Univ., Saskatoon, Sask., Canada ; Sachdev, M.S. ; Wood, H.C. ; Nagpal, M.

The authors present the design, implementation and testing of a microprocessor-based high-speed relay that correctly detects transformer winding faults. Instead of relying on the presence of harmonics to identify magnetizing inrush, it uses a nonlinear model of the transformer to determine the state of its health. One version of the relay is suitable for protecting single-phase transformers, whereas another version is for protecting three-phase transformers. A three-phase delta-wye 15 kVA transformer was used to test the relay for a variety of operating conditions. The results show that the relay performs well

Published in:

Power Delivery, IEEE Transactions on  (Volume:7 ,  Issue: 1 )