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The distribution network smart switch establishes a powerful terminal
Distribution Network Intelligent Switch Establishes a Powerful Terminal
The newly constructed 10kV 114 line differs from conventional renovations; distribution network intelligence is a major feature of this line. A total of 9 intelligent distribution switches have been installed on this line. When faults occur on the line during severe weather, the intelligent distribution switches automatically analyze and judge fault information, quickly locate the fault area, and remotely control switches through the distribution system to rapidly isolate the fault area on the distribution line. Power supply is automatically restored to non-fault areas, significantly improving power supply reliability and reducing the adverse impact on customers caused by large-scale and prolonged outages. After fault repair is completed, power restoration can also be remotely controlled through the system, which is more time- and labor-efficient compared to the previous manual on-site power restoration, greatly alleviating the power supply pressure during peak summer demand.
"Today's construction is relatively complex, with 16 people dispatched to 6 points simultaneously to reroute the power supply of 6 transformer areas from the original line to the new line. After the entire 10kV Jinniu 114 line is put into operation, it will replace the old line to supply power to villages such as Jin Niu Zhen Hu Shao, Wei Ba, and Jian Kang. To minimize the impact on users in surrounding areas during construction, we specially deployed live-line work teams and medium-voltage power generation vehicles. While promoting high-quality rural grid upgrades, we also ensure 'zero perception' of power use by nearby users," said the on-site work leader. This rural grid upgrade involves about 2,600 households across 3 villages. The renovated line crosses densely populated areas with a long span and large coverage, posing significant safety and outage management challenges. To minimize the impact on residents and ensure smooth project implementation, State Grid Hefei Power Supply Company planned ahead, deployed meticulously, actively coordinated, and scientifically formulated live-line work and medium-voltage power generation vehicle power supply plans to minimize the impact on surrounding power customers caused by the renovation.
Distribution Network Automation Self-Healing Function Builds an Intelligent Brain
While accelerating the construction of intelligent distribution network hardware, State Grid Hefei Power Supply Company simultaneously strengthened the software capabilities of the intelligent distribution network system. "Baishan Substation's Baishan 105 line and Shishan Substation's Zhengwu 107 line have been equipped with distribution network automation self-healing functions; please enhance monitoring." Upon the dispatcher's command, other personnel closely monitor the real-time status and data feedback of various power supply lines on the electronic big screen. The line equipment status shows all normal, marking the successful implementation of the distribution network automation self-healing function on Baishan 105 line and Zhengwu 107 line after more than two months of unremitting efforts by State Grid Hefei Power Supply Company. This is the first line in Hefei's county area to have the distribution network automation self-healing function, representing the county-level distribution network automation construction entering the "AI" era.
"This function is like antivirus software in a computer. When a fault occurs on the distribution line, the system can automatically detect the fault location and isolate it while restoring power supply to non-fault areas. Compared to the past, the average time for fault location and repair per distribution network fault is reduced by 30-40 minutes or more." According to staff, the distribution network automation self-healing function, through the cooperation of distribution terminals and the master station, analyzes and judges the protection trip and close signals uploaded by terminals when a fault occurs. It determines the fault area, automatically remotely controls on-site equipment to isolate the fault point via the distribution master station system, and restores power to non-fault areas. The outage time is shortened from minutes to seconds, effectively reducing the number of affected households and improving power supply reliability. The entire fault judgment process requires no manual intervention, enabling rapid handling and greatly alleviating the load on power supply stations.
Remote Backup Automatic Transfer Device Injects Power Supply Booster
"The 35kV Zhuanqiao 364 switch received the remote closing command and successfully closed!" State Grid Hefei Power Supply Company organized staff to conduct the final commissioning of the remote backup automatic transfer device at the 35kV Zhuanqiao substation. With the device put into operation, four substations led by the 35kV Zhuanqiao substation became the first substations in Lujiang area equipped with remote backup automatic transfer devices. Meanwhile, Lujiang County achieved full coverage of backup automatic transfer devices across all 24 substations, improving the power supply reliability within the coverage area of these substations.
The backup automatic transfer device is an automatic device that quickly switches to a backup power source when the working power supply is interrupted due to power system faults or other reasons, or automatically transfers the powered-off equipment to another normally operating power source, enabling users to quickly restore power supply.
To ensure the smooth commissioning of the remote backup automatic transfer device, State Grid Hefei Power Supply Company successively completed secondary cable laying, secondary line connections, device logic verification, optical fiber link communication, device setting verification, signal circuit improvement, and circuit breaker operation. To guarantee the smooth implementation of all tasks, the company conducted on-site surveys in advance and prepared the "Three Measures and One Plan." Strictly enforcing production site safety management requirements and emphasizing "safety first" without relaxation ensured that all work was controllable and under control.
"Mentorship" Mechanism Cultivates "General Practitioners"
"After the backup automatic transfer device is put into operation, it will effectively save manpower and material resources while ensuring power supply quality and achieving the goal of quality and efficiency improvement. This technology is very important. During the implementation process, we also focus on 'mentorship,' allowing experienced workers to teach skills to young people," said the on-site work leader. To help young employees quickly master professional skills and improve their professional competence, the company organized operation and maintenance team members to visit the 35kV Shuangmiao substation for skill training and video observation activities. The party branch committee participated throughout the process, with party members taking the lead. Using online live streaming, they independently implemented the backup automatic transfer device renovation project. Following the city-county integrated "team composite talent cultivation" principle, they trained young key employees to become "general practitioners" in inspection and testing.
In recent years, with the development of technology and artificial intelligence, smart grids have emerged. State Grid Hefei Power Supply Company has increased investment in intelligence across regulation, substation, transmission, and distribution fields. Taking rural grid upgrades and line technical renovations as opportunities, it accelerates the digital transformation of the power grid. As the nerve endings of the power grid, distribution networks connect the main power grid to thousands of households. With changes in energy supply structure, the demand for high reliability in distribution networks is increasing. Since the beginning of this year, State Grid Hefei Power Supply Company has deepened the application of distribution automation construction, continuously improving the coverage of primary and secondary integrated equipment and intelligent terminals in the distribution network, and constantly enhancing the automation application functions of distribution master stations, laying a solid foundation for the deployment of distribution network automation self-healing functions. It has successively achieved full coverage of backup automatic transfer devices in substations and built the first line with distribution network automation self-healing functions in the Chaohu and four counties area of Hefei. Next, State Grid Hefei Power Supply Company will increase efforts in digital grid planning and construction, combine the characteristics of Lujiang townships, create a smart grid that fits the electricity usage characteristics of Lujiang area, carefully summarize successful experiences, form replicable and promotable smart grid construction plans, promote them county-wide, and rely on the smart grid to drive high-quality economic development in the county.
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