State Grid Shaoxing begins seasonal power grid maintenance

State Grid Shaoxing Power Supply Company started its autumn maintenance season for grid equipment on Sept 15. It plans to complete 394 main-grid outage maintenance projects, covering equipment from 35 kV to 500 kV across the city.

To coordinate different work areas and disciplines, the company used the summer peak season as a preparation window. Supervisors carried out on-site surveys, identified equipment hazards and operational risks, inspected tools and instruments, and tightened equipment access. These steps helped ensure safety measures were in place before autumn work resumed.

At the 220 kV Jiangtao Substation, workers used precision instruments such as endoscopes to scan the gas compartments of the 220 kV positive and negative bus grounding disconnectors. This removed foreign-object risks that could cause insulation breakdown and tripping.

At the 220 kV Honglian Substation, the company optimized load transfer and adopted a half-outage, half-transfer maintenance model.

Within the 220 kV Class C maintenance outage window, it completed 110 kV and 35 kV work. The total outage period fell from 18 days to eight days, and the duration of Level III operational risk dropped by 56 percent, reducing repeated operations.

State Grid Shaoxing will continue its seasonal maintenance program, focusing on managing on-site risks and ensuring the reliability of the city's power grid.