Core Viewpoint - The expansion project of the Helanshan 750 kV substation is significant for enhancing regional power supply stability and supporting efficient integration of renewable energy sources [1] Group 1: Project Details - The Helanshan 750 kV substation expansion involves the installation of 18 dry-type air-core current-limiting reactors, which are the largest of their kind in the country [1] - The project commenced construction in September 2025 and is expected to be operational by June 2026 [1] Group 2: Technical Advancements - The newly installed dry-type air-core reactors eliminate risks associated with oil leakage and fire hazards, providing a safer alternative to traditional oil-immersed reactors [1] - These reactors will quickly limit short-circuit currents during grid faults, effectively mitigating the impact of excessive currents on electrical equipment within the substation [1] Group 3: Impact on Power Supply - The operationalization of the Helanshan 750 kV substation expansion will significantly enhance the stability of the regional power grid and improve current flow control capabilities [1] - The project will provide robust support for the efficient integration and consumption of renewable energy in the region [1]