Reduction of inrush current for transformer using sequential switching method

Nowadays, solar power becomes one of the most suitable renewable energy source for power generation. In practice, inrush current is produced in grid connected transformer(s) during routine switching process of solar power plant. This inrush current effects to winding of transformer as well as produces harmonics and power quality issues. In this paper the calculation of inrush current and its effect on power system network is elaborated. Possible cost effective solution for reduction of inrush current by suitable techniques is discussed in this paper. In sequential switching technique, better suppression of inrush current and harmonics is obtained.