Signal extraction from inrush current for inter-winding fault protection of power transformers

In case of transformer failure there is a high risk of losing part of power system, which can result in disruption for consumer power supply. This is the main reason for power transformer protection requirements to be so high. Power transformer is a complicated object considering its protection. Sensitivity level is a key element in inter-winding faults detection. Incomplete winding faults that occur in the multi-wire transformer windings, when multiple parallel wires form a coil, are very hard to detect, this is why it is the most challenging issue for the differential protection. Our idea is in creating a microprocessor based device that will use an inrush current surge as an information source for inter-winding fault detection within transformers.