Design of Hardware Setup Based on IEC 61850 Communication Protocol for Detection &amp; Blocking of Harmonics in Power Transformer

Abdul Azeem,Shamimul Qamar,Majid Jamil,Rayees Ahmad Thokar,Hasmat Malik

doi:10.3390/en14248284

Abstract

In this paper, the authors have developed a hardware model for blocking even and odd harmonics of a power transformer. In the proposed hardware model, intelligent differential & over-current relays are used for the blocking of harmonics of a power transformer. The harmonic restraint function on the differential relay (7UT61) prevents the relay from tripping during transformer magnetizing inrush current. However, the over-current relays which are used for back up protection does not have a harmonic restraint element, and over-current relay trips due to magnetizing inrush current, causes unwanted interruptions and power failures. The establishment of harmonic blocking scheme for over-current protection in power transformers is an important finding of this research study. IEC61850 standard-Based GOOSE (Generic Object Oriented Substation Event) applications used in power transformer protection for fast detecting and clearing of faults is an interested study presented in the proposed work.

Highlights

A transformer is an integral part of the power system
The results presented demonstrate second harmonic blocking method to ensure safety during energization of both the Intelligent Electronic Device (IED) (7UT61 and 7SJ64) for transformers
The results presented demonstrate fifth harmonic blocking method to ensure security of power transformers during over-excitation condition

Summary

Introduction

A transformer is an integral part of the power system. Electricity is generated in different ways, but without a transformer, we can neither transmit nor distribute electricity. The condition of the transformer is monitored to reduce the rate of failure. The tion of the transformer is monitored to reduce the rate of failure. If the inrush current is increased in the power transformer, it has the capability that it can block the harmonics. In this model, IEC 61850 Protocol is employed to communicate between IEDs to block even and odd harmonics (2nd & 5th) in power transformers. To demonstrate the efficacy of the developed model the harmonic blocking procedure is performed over a range of transformer magnetizing inrush current conditions.

Overview of IEC 61850

Experimental Results Demonstration

Experimental Results Demonstration for 2nd Harmonic Diagnosis

Experimental Results Demonstration for 5th Harmonic Diagnosis

Conclusions and Future Scope