State Grid Wuzhong completes main transformer upgrade

The No 2 main transformer of the 110 kV Maihe Substation, operated by State Grid Wuzhong Power Supply Company, successfully completed five circuit breaker closing and inrush current tests at 10:50 pm on May 17, officially entering the energized trial operation phase.

The company adhered to high-quality standards and strict requirements throughout the project. During the preparation phase, technical experts conducted multiple on-site surveys to assess the existing equipment and analyze future electricity demand in the region.

The construction plan was refined repeatedly, with clear responsibilities, standardized procedures, and defined technical controls.

During construction, the team faced challenges such as equipment disassembly, installation, upgrades, and power outage coordination. A standardized workflow was implemented. For high-risk tasks, tailored safety measures were introduced, and dedicated personnel supervised the entire process. Key operations like hoisting and high-altitude work were closely monitored.

All safety hazards were identified and addressed, resulting in zero accidents. A quality control record system was also established. Every step and every piece of equipment underwent strict inspection and acceptance — from installation accuracy to testing indicators — ensuring zero defects.

The successful commissioning of the No 2 main transformer will significantly boost the substation's power supply capacity and grid reliability, easing power pressure in the Hongsibu area and supporting high-quality local economic development.