New Artificial Neural Network Based Magnetizing Inrush Detection in Digital Differential Protection for Large Transformer

The impact of inrush on large transformer differential protection has not been solved satisfactorily. A new intelligent ANN based scheme for digital differential protection is proposed in this paper to distinguish inrush from internal fault in a transformer. The new scheme is based on multi-condition restraint which introduces voltage features as a criterion. Test results show the advantages in comparing with traditional second harmonic restraint method. The new intelligent scheme can meet the requirements for large transformer protection.