Analysis and Mitigation of Geomagnetically Induced Currents (GICs) for Three-Phase Power Transformer

Abstract

This paper describes the effects of Geomagnetically Induced Currents (GICs) on three phase power transformer and mitigate this phenomena using capacitor and resister connected series on ground of transformer. There are two part for this paper, first part describe the effects of GICs on all phases for the transformer and hysteresis loop, second part describe and analysis the methods of mitigation the GICs using capacitor and resistor connected parallel and then connected series with GICs at grounded transformer. GICs enter from neutral point for the wye winding of transformer that lead to damage the transformer and causes some problems like, half-cycle saturation, transformer heating, increase reactive power consumption, and produce harmonics. MATLAB-SIMULINK software used to simulate the three phase power transformer.