Wenzhou, Zhejiang: Intelligent Inspections Improve Power Grid Reliability During Summer

"The infrared thermometer reading of the No. 1 main transformer at the 220kV Feiyun substation is 63 degrees Celsius, which is normal. We will continue to strengthen the monitoring and control of the transformer load and implement temperature control and cooling measures!" At 12:00 on July 5th, maintenance personnel from the State Grid Wenzhou Power Supply Company conducted temperature monitoring of the high-load main transformer at the 220kV Feiyun substation.

It is understood that a week ago, the company's maintenance personnel had received an alarm notice from the new-generation centralized control system indicating that the transformer oil temperature exceeded the limit. They immediately retrieved real-time operating data from the intelligent inspection system and used remote high-definition video to check the transformer and oil temperature meters from multiple angles. After checking, they initially determined that the meter readings were normal. They quickly went to the site, where they measured the substation temperature with an infrared thermometer and finally confirmed that the transformer temperature was normal, therefore indicating a deviation in the data collected from the backend. The defect was then reported for processing. From alarm to initial assessment, only a few minutes elapsed—this is a practical example of the State Grid Wenzhou Power Supply Company's application of intelligent inspection to cope with peak summer power demand during operation and maintenance. Meanwhile, the company deeply integrates intelligent technologies such as video surveillance, robotic inspection, and infrared thermometry, gathering comprehensive data on equipment operation, the equipment itself, and the environment. Relying on 3D dynamic simulation and multi-dimensional analysis, it achieves automatic anomaly alarms and intelligent health status evaluation, constructing a holistic equipment status perception system and building a three-dimensional inspection network of "human-machine collaboration and intelligent control," enabling rapid identification and intelligent decision-making for equipment anomalies.

Since the start of the peak summer season, the high temperatures in Wenzhou have led to higher electricity demand and a continuously increasing electricity consumption trend, placing greater strain on power supply security. The grid load has repeatedly reached new highs, significantly increasing the risk of various sudden anomalies. Faced with this severe challenge, the State Grid Wenzhou Power Supply Company deeply understands the extreme importance of ensuring safety, supply, and people's livelihoods during the peak summer season. It leverages the advantages of its integrated operation and maintenance and operation and monitoring model, breaking down the traditional multi-layered workflow barriers of "monitoring reporting—maintenance confirmation—repair dispatch." Once an anomaly is identified, it quickly handles false alarms and other anomalies, seamlessly connecting problem discovery and resolution, achieving a rapid closed loop from alarm to fault elimination, minimizing the impact time of faults, and ensuring the safety and controllability of grid equipment.

High temperatures and scorching heat, coupled with a sharp increase in load, bring more challenges to the status monitoring and emergency response capabilities of power substation equipment. The State Grid Wenzhou Power Supply Company will continue to deepen the collaborative mechanism of "intelligent inspection system + integrated operation and maintenance," using digital means to improve the accuracy of equipment management and control, and using integrated teams to enhance emergency response speed, to fully ensure the safe and stable operation of power grid equipment and safeguard the coolness of every household.

（By MENG Hang, XIA Ronghui, CHEN Zhixin）