Core Viewpoint - The completion of the annual maintenance of eight converter stations in Sichuan Province enhances the reliability of the power grid and ensures stable electricity supply during the winter peak season [1][4]. Group 1: Maintenance Overview - The annual maintenance of the eight converter stations was conducted in batches during the spring and autumn when the grid load is relatively low, totaling 52 days [2]. - A total of over 3,300 personnel were involved in the maintenance, completing hundreds of repair and technical improvement tasks [2]. Group 2: Technological Advancements - The State Grid Sichuan Electric Power has implemented a proactive defense system for converter transformers, significantly improving the inherent safety level of the equipment [2]. - Specific strategies were developed for older converter stations to update key components, effectively extending the equipment's lifespan [2]. Group 3: Operational Impact - As of now, the Sichuan direct current transmission channel has delivered over 1.6 trillion kilowatt-hours of electricity [4]. - The successful completion of the maintenance further strengthens the operational reliability of the power grid, providing robust support for electricity supply in Sichuan and the eastern and central regions during winter [4].