Recently, following the dispatch command, the 220-kilovolt substation at State Grid Heilongjiang Hydropower Plant's Lianhua Power Plant officially commenced operations. The project, completed in eight months, marks the first upgrade of a conventional hydropower plant substation to a gas-insulated, fully enclosed combined electrical apparatus (GIS) in the province. Its operation signifies a critical breakthrough in Lianhua Power Plant's transition toward intelligent and modernized operations, injecting strong momentum into the green upgrade of the regional energy structure.
Originally put into service in 1996, the 220-kilovolt substation at Lianhua Power Plant had gradually faced challenges such as aging equipment, rising maintenance costs, and safety risks due to its open-air design. The renovation strictly adhered to State Grid's directive of "indoor equipment and intelligent operation," overcoming three major technical difficulties: high-support formwork construction, large-span beam installation, and multi-task coordination. The new GIS substation occupies only 1/20th of the original site, achieving highly efficient land use while significantly improving equipment reliability and power supply capacity.
The project integrates multiple advanced technologies and intelligent systems, aligning with digital and smart development trends. The GIS facility is equipped with 68 partial discharge sensors, an SF6 leakage monitoring system, and an intelligent auxiliary control system, greatly enhancing fault detection and reducing manual inspection workloads. Additionally, fire alarms, gas concentration monitoring, and other systems are connected to a centralized control platform, enabling remote precision management and substantially improving operational efficiency and safety.
Estimates suggest that the substation will enhance Lianhua Power Plant's power supply reliability and risk resilience during peak winter demand, maintaining an annual power generation of over 800 million kilowatt-hours. This translates to a reduction of 320,000 tons of standard coal consumption and 217,600 tons of carbon emissions. Beyond ensuring stable operations and reliable regional grid supply, the project will accelerate green energy transformation, providing sustainable and eco-friendly power support for the province's high-quality development.
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