Countermeasures for reducing the zero sequence circulating current in parallel untranposed 154kV four-circuit systems.

154kV 송전계통 비연가 4회선 병행선로에서의 영상순환전류 감소대책

This paper proposes the proper phase arrangement of transmission lines for reducing the zero sequence circulating current. It is a well-known fact that the zero sequence circulating currents are principally caused by the untranposed lines and numerical estimation method already has been established. In this paper, the circuit analysis for calculating the zero sequence circulating currents was performed on the existing 154kV four-circuit systems of KEPCO and the proper phase arrangement was determined.