State Grid Baofeng completes zero-defect pre-commissioning tests at Youyuan Substation

On Nov 4, the testing team from the operation and maintenance department of State Grid Baofeng County Power Supply Company completed a series of pre-commissioning handover tests and equipment verification. These covered the circuit breaker, current transformer, and lightning arrester in the 10 kV You7 (You-Tie) bay at the 110 kV Youyuan Substation. The work eliminated potential equipment risks and provided a technical foundation for high-quality scheduled commissioning.

The bay includes vacuum circuit breakers, current transformers, and lightning arresters and is a key unit for reliable power delivery. To achieve zero-defect, zero-hazard commissioning, the team followed State Grid substation maintenance regulations, prepared a special test plan, and clarified procedures, safety risks, and control measures. It then conducted comprehensive, high-standard routine handover tests on all high-voltage equipment in the bay.

During testing, staff followed standardized procedures and completed three core insulation tests. These tests verified the overall insulation performance and helped identify hidden defects such as insulation aging and external damage, confirming the equipment can withstand normal operation and transient overvoltage.

The team enforced on-site safety controls, standardized test wiring, voltage application, data recording, and post-test discharging. It also checked test data, equipment appearance, installation workmanship, earthing connections, and labels on an item-by-item basis. All of the results were qualified and met regulatory standards, while the mechanical performance, insulation level, and electrical characteristics met all the commissioning requirements.

The completed tests verified installation quality and insulation reliability and removed safety risks before commissioning.

State Grid Baofeng County will continue carrying out pre-commissioning inspections to ensure smooth commissioning, improve supply reliability at the 110 kV Youyuan Substation and support stable power supply in its service area.