重庆璧山：首台220千伏混合绝缘油变压器改造完成

Group 1 - The core viewpoint of the news is the successful commissioning of the 220 kV Tianjia Substation's main transformer, which enhances the power supply capacity in the Banan District of Chongqing, addressing the growing electricity demand due to regional economic development [1][2] - The Tianjia Substation, operational since March 2001, has been a critical hub in the regional power grid for 24 years, necessitating the upgrade due to aging equipment and issues such as rust and wear [1] - The upgrade project involved replacing two main transformers with new 180,000 kVA units, utilizing innovative technologies to improve efficiency and safety during the installation process [1][2] Group 2 - The first main transformer replacement began on April 14, marking the first use of hybrid insulating oil in 220 kV equipment in China, which offers superior performance compared to traditional mineral oil [2] - The hybrid insulating oil significantly extends the lifespan of insulation paper, with a thermal aging rate reduced, resulting in a lifespan 1.91 times longer than that of mineral oil [2] - After the completion of the transformer upgrades, the power supply capacity in the Banan District will increase by 60,000 kW, supporting industrial development and enhancing the reliability of power supply across multiple substations [2]