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Overview：
In accordance with State Grid Corporation's “1135” distribution network operation service management requirements, the Corporation collaborated with the Electric Power Research Institute, design institutes, operational units, and testing agencies to develop integrated primary/secondary ring network cabinets. This initiative aims to facilitate universal interchangeability of equipment from different manufacturers within specified ranges and timeframes, enhance operational maintenance convenience for ring network cabinets, and enable seamless replacement with equipment from other manufacturers when failures occur during operation or quality issues are identified through spot checks.