Characteristic of the Power-Frequency Induced Current and the Corresponding Power Loss on the OPGW of 220 kV Overhead Line

220 kV overhead transmission line is one of the longest high-voltage transmission line systems in China, and the insulating modification of its widely used tower-by-tower grounded optical fiber composite ground wire (OPGW) will have critical prospects and potential for energy saving and power-transmission efficiency. At present, there are relatively few studies on the power-frequency induced current and power loss in the tower-by-tower grounding mode of OPGW for 220 kV overhead transmission lines, the results of which are an important prerequisite for the feasibility analysis of OPGW insulation technology. Based on the modeling and numerical simulation of the ATP-EMTP software platform, this paper investigates the OPGW power-frequency induced current and the corresponding power loss characteristics for 220 kV overhead lines with the recommended double-circuit towers and lines according to the standard design files. The characteristics of induced current and power loss influenced by different standard towers, line heights, DC resistance of the OPGW, tower span, and phase sequence are and analyzed and summarized with well sensitivity analysis. The present study is of great significance for guiding the comprehensive evaluation of the technical feasibility and economic performance of OPGW insulation retrofit.