en.Wedoany.com Reported - The main transformer inlet second circuit 500 kV high-voltage power cable AC withstand voltage and partial discharge test was successfully completed at State Grid Xinyuan's Hebei Yixian Pumped Storage Power Station. The test was passed in one attempt, marking that the key external transmission channel of the power station is fully ready for power delivery, and the project has officially entered the final sprint stage of unit commissioning and system joint debugging.
As a key energy project in Hebei Province, the Yixian Pumped Storage Power Station is invested in and constructed by State Grid Xinyuan Company, a subsidiary of State Grid. The project has a total installed capacity of 1.2 million kilowatts, equipped with 4 vertical single-stage Francis pump-turbine motor-generator units, each with a capacity of 300,000 kilowatts. The power station is designed with an annual power generation of 1.8 billion kilowatt-hours and an annual pumping electricity consumption of 2.4 billion kilowatt-hours, mainly undertaking tasks such as peak shaving, valley filling, frequency regulation, and emergency backup for the North Hebei power grid.
The 500 kV high-voltage cable that passed the acceptance test is the "main artery" for the power station's energy transmission. Due to the stringent insulation performance requirements for the 500 kV extra-high voltage level, the engineering team conducted strength verification on the cable body, intermediate joints, and terminals under extreme voltage environments. Test data shows that all key insulation parameters are superior to industry standards, successfully eliminating the hidden danger of partial discharge caused by insulation defects and ensuring that the cable will not experience breakdown faults during long-term operation.
Looking back at the project construction cycle, the power station officially started construction in 2017, with a total investment of approximately 8 billion yuan. As of now, the civil engineering of the underground powerhouse has been largely completed, and the water diversion system and tailwater system have passed acceptance. With the transmission line ready for energization, the first unit is planned to achieve grid-connected power generation within 2026, and all units are expected to be operational by 2027.
The completion of this project will significantly enhance the regulation capacity of the Beijing-Tianjin-Hebei power grid. According to publicly available information, after the power station is put into operation, it can save approximately 89,000 tons of standard coal consumption and reduce carbon dioxide emissions by about 210,000 tons annually. This not only optimizes the regional energy structure but also provides flexible energy storage support for the large-scale integration of wind power and photovoltaic cells in North China.
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