Review: Different Techniques for Transformer Inrush Current Protection

Transformer is one among the vital components of electric power system. Transformers are invariably protected by using differential protection. But the differential protection sometime may malfunction thanks to inrush current whenever a transformer is energized. Several methods like per-phase method, cross blocking method, percent average blocking method and Harmonic sharing method are already alive. With the day to day increase of the facility and therefore the increasing rate of industrialization. The quantity of power to be developed and therefore the safety of the facility transformers have increased manifolds. For optimum results it is required to possess nearly a no fault operation of power transformer. The target of this work is to present a controller or method which could predict the unwanted outages during a small interval of your time and with accuracy. The controllers like PI, PID are in use in industries over a decade and located to be very useful also. But during this case these controllers are not found to offer reliable results thanks to the oscillating and non – periodic nature of the facility transients. This paper is reviewing the various past technologies for transformer inrush current protection. This paper are going to be considerably useful for future researcher and students those curious about field of transformer protection system.