A REVIEW OF TECHNIQUES USED FOR DISCRIMINATION OF INRUSH CURRENT AND INTERNAL FAULT CURRENT OF A POWER TRANSFORMER

Purushottam R. Bharambe; Sudhir R. Paraskar; Saurabh S. Jadhao

doi:10.17605/OSF.IO/8XAQM

Authors

Purushottam R. Bharambe Assistant Professor Department of Electrical Engineering, SSGMCE, Shegaon
Sudhir R. Paraskar Professor & Head, Department of Electrical Engineering, SSGMCE, Shegaon
Saurabh S. Jadhao Assistant Professor Department of Electrical Engineering, SSGMCE, Shegaon

DOI:

https://doi.org/10.17605/OSF.IO/8XAQM

Keywords:

Transformer, magnetizing current, fault current, differential protection

Abstract

The transformer draws a magnetizing inrush current during the energization. This current has a magnitude six to eight times the rated current which may lead to false tripping of the differential relay causing the problem of unnecessary disconnection of the transformer from the supply mains. The proper discrimination between the transformer inrush current and internal fault current is necessary in order to avoid the false tripping of the differential relay and for the proper operation of the transformer. The second harmonic restraint relay is used in the conventional protection system for discrimination between the inrush current and internal fault current. The energy demand is increasing nowadays, so in order to feed the ever-increasing power demand, the size and complexity of the emerging power system is increasing. In order to protect the emerging power system and its important components like a transformer, we need a fast, stable & a reliable protection system. Therefore, the ongoing research is now focused on developing novel algorithms for the proper distinction between inrush current and internal fault current. This paper presents a review of various techniques used for discrimination between the inrush current and an internal fault current of the transformer. This will help the new researcher working in this area.

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