IJREE- Volume 3 Issue 2 Paper 1

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DISCRIMINATION OF INTER-TURN FAULTS FROM MAGNETIZING INRUSH CURRENTS IN TRANSFORMERS: A WAVELET TRANSFORM APPROACH 

Author’s Name : Dr.S.R.Paraskar

Volume 03 Issue 02  Year 2016  ISSN No:  2349-2503  Page no: 1-6

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 Abstract:

Power transformers are designed to transmit and distribute electrical power. Depending on the size of a transformer, replacement costs can range from a few hundred dollars to millions of dollars. Performing invasive tests also add to the replacement cost. Hence, there is an increasing need to move from traditional schedule-based maintenance programs to condition-based maintenance. A focused approach is required for diagnostics. Considering the long service life of a power transformer and prevalent use of human judgment (expert), there is a need to develop a knowledge base expert system. This paper proposes a noninvasive approach, using digital signal processing wavelet-based artificial neural network technique for monitoring non stationary variations in order to distinguish between transformer inrush currents and transformer inter-turn faults. The performance of this algorithm is demonstrated on custom-built three-phase transform.

Keywords:  

Transformer, Inrush, Interturn fault, Wavelet Transform, Artificial Neural Network

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