Core Viewpoint - The second phase of the DC system renovation project at the Itaipu Hydroelectric Power Plant in Brazil, undertaken by a Chinese company, has officially commenced, marking a significant upgrade in the plant's 40-year operational history [1][2]. Group 1: Project Overview - The renovation project is a major undertaking by China National Grid's subsidiary, China Electric Power Equipment and Technology Co., Ltd., and represents the first large-scale DC transmission renovation project undertaken by the State Grid overseas [1]. - The Itaipu Hydroelectric Power Plant is one of the largest in the world, with its DC transmission system built in the 1980s, setting multiple records in voltage levels and transmission capacity [1]. Group 2: Project Details - The renovation project began on January 9, 2024, and includes system research, design, equipment supply, installation, debugging, training, and auxiliary operation and maintenance, divided into two phases [1]. - The first phase, which involved the modification of the valve hall, was completed 40 days ahead of schedule on December 7, 2024, receiving high praise from Brazil's national electricity company [1][2]. Group 3: Technical and Operational Aspects - The second phase of the renovation will take two years, with the current bipolar 1 shutdown scheduled from May to November, covering the Iguaçu and Ibiúna converter stations [2]. - The project involves the dismantling and installation of equipment in seven valve halls, comprehensive civil and electrical construction at both stations, and upgrades to the bipolar 1 control protection system [2]. - The project is characterized by its technical complexity, large workload, tight schedule, and the need for extensive coordination among multiple participating units [2].