State Grid Jiaxing strengthens fault response for distribution network

A fault caused the Meigui 2Y1 feeder from the Yunhe substation to trip on July 21. Wang Ning, a distribution network dispatcher with the State Grid Jiaxing Power Supply Co (State Grid Jiaxing), completed an initial fault report using a standardized template. After analyzing and isolating the fault, he submitted a second report and synchronized the information immediately after power supply was restored, adhering to the company's tiered fault management mechanism.

As severe convective weather, thunderstorms, and strong winds become more frequent during the summer, distribution network faults have increased significantly, straining response services. Under the previous response model, inconsistent reporting standards, coordination challenges during multiple concurrent faults, and a lack of standardized procedures for different fault scenarios often affected response efficiency.

To address these challenges, the company has established a closed-loop reporting mechanism covering the entire fault-handling process, with unified reporting standards and mandatory response timelines to improve the timeliness and consistency of information sharing.

The company requires an initial report within three minutes after a line trip, a rapid update within five minutes, and a second report within 15 minutes after the fault is analyzed and isolated. The mechanism also clearly defines responsibilities, procedures, and response deadlines for each stage of the fault handling process.

A tiered command mechanism has also been introduced, with response levels determined by the number of feeder trips occurring within one hour. The approach enables command resources to be matched to the scale of an incident, improving coordination during multiple simultaneous faults.

Additionally, the company has developed standardized response plans for four typical distribution network grounding fault scenarios, providing detailed inspection procedures and handling guidelines to improve troubleshooting accuracy and response capability.

Since the mechanism was introduced, all initial fault reports have been submitted on time, while reporting accuracy has remained above 99 percent. Overall fault-handling efficiency has improved by 30 percent.

The company said it will continue refining the mechanism by integrating digital technologies and enhancing intelligent fault analysis capabilities to further strengthen distribution network reliability and ensure stable electricity supply during the summer peak demand period.