The Eco-friendly Gas Insulated Ring Main Unit (Upper Isolator) is built around a primary-secondary integrated ring main unit and incorporates advanced, effective algorithms for short-circuit and ground fault detection to support zero-carbon operation. It uses dry air as the insulation medium instead of SF6, featuring a maintenance-free fixed structure and a proven enclosure welding process, resulting in lower environmental impact and enhanced safety. By integrating advanced technologies such as Internet+, IoT+, and low power consumption, it improves the distribution grid's capabilities in intelligent perception, intelligent control, integrated decision-making, and reliable power supply. This unit offers a low-carbon, environmentally friendly, safe, and reliable solution for the green development of distribution grids.