en.Wedoany.com Reported - The Grade-A overhaul project for Unit 4 at Angu Hydropower Station was completed 10 days ahead of schedule, taking 129 days in total. The project achieved the goals of zero accidents and zero delays, with all test data meeting excellent standards. Compared to last year's 152-day overhaul cycle, the total duration was shortened by 23 days, demonstrating a significant improvement in management efficiency.
With the unit returning to the grid ahead of schedule, it can generate an additional 4.5 million kilowatt-hours of electricity daily, meeting the daily electricity demand of approximately 150,000 households in the southwestern Sichuan region. This is expected to increase power generation revenue by millions of yuan. Additionally, the overall flood control capacity of the power station has been enhanced by 600 cubic meters per second, providing more reliable safety assurance during the main flood season of the Dadu River.
The maintenance management team of Zhongshui Shengda Company adopted a parallel operation mode and optimized processes to overcome challenges such as delayed spare parts supply and damaged thrust bearing pads. By introducing three-dimensional digital measurement technology, the team conducted precise inspections of the runner and runner chamber, improving the unit's operational stability during the flood season. The overhaul supervisor stated, "Completing the overhaul in just 129 days this year relied on meticulous management and teamwork."
On April 2, Unit 4 was successfully synchronized to the grid. The maximum swing of the guide bearings decreased from 237 micrometers to 124 micrometers, and the thrust pad temperature dropped from 62.1 degrees Celsius to 60.8 degrees Celsius, indicating a significant improvement in equipment reliability. As a key power station with a total installed capacity of 772 megawatts, the unit's return to full-load operation will strongly support the power supply in the southwestern Sichuan region. This overhaul showcased the comprehensive capabilities of PowerChina Hydropower Development Company in both technology and management.
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