Overhead Transmission Line Protection Against External Damage

　　In 2016, just recently concluded, State Grid Shouguang City Power Supply Company successfully achieved its annual goal of "zero external damage" to transmission lines at 220 kV and above that cross the city limits. Over the past year, the company's employees—both management and frontline staff—have remained steadfastly committed to safeguarding these critical transmission lines, braving extreme cold, scorching heat, wind, frost, rain, and snow. With unwavering dedication and tireless effort, they’ve effectively neutralized every potential threat of external damage, ensuring uninterrupted power supply and protecting the community’s reliable access to electricity.
　　Shouguang is a crucial channel for transmitting electricity from west to east in our province. Within its jurisdiction, the ±660 kV Yindong DC transmission line, along with seven 500-kV lines and 19 220-kV lines, traverse the area, making the task of maintaining these power facilities particularly challenging.
　　To improve the operational quality of transmission lines and effectively manage transmission line corridors, the company has revised and issued the "Implementation Plan for Localized Protection of Transmission Line Corridors," clearly outlining specific responsibilities, operational standards, and evaluation criteria, including rewards and penalties. The company will continue to uphold the primary responsibility of local power supply stations in protecting transmission lines, having signed "Transmission Line Protection Responsibility Agreements" with each station to strengthen patrol and protection efforts within their respective jurisdictions.
　　The company has stepped up its reporting and communication efforts with local governments, actively seeking support from authorities at all levels. In collaboration with the Shouguang Municipal People's Government, a formal "Red-Headed Document" was issued, titled "Notice on Properly Conducting Clearing and Harvesting Operations for Ultra-Tall Trees Along Transmission Line Corridors," which clearly outlines the responsibilities of relevant departments such as the Bureau of Economy and Information Technology, Safety Supervision, Public Security, and Forestry. Additionally, an urgent telegraphic notice titled "Notice on Launching a Special Inspection and Management Campaign for Greenhouse Films Within Power Line Protection Zones" was distributed, using administrative measures to encourage greenhouse farmers to voluntarily implement protective measures. By fully leveraging the support of local governments and capitalizing on the operational advantages of being based in the region, the company is strengthening its efforts to clear obstacles within protection zones. At the same time, it is intensifying public awareness campaigns through various media channels, actively rallying local communities to understand and support these initiatives.
　　Since the implementation of localized operations, the company has fully leveraged the widespread distribution of personnel across its local power supply stations, successfully reducing the inspection cycle for transmission lines while significantly improving inspection quality. As a result, tasks such as clearing obstacles within protection zones, preventing external damage, promptly identifying defects, and efficiently addressing faults have all seen marked improvements. This has also led to a substantial acceleration in the grid’s emergency response time during equipment failures, minimizing both grid fault-related losses and their broader impacts. Ultimately, these measures have effectively mitigated risks along transmission line corridors, reduced incidents of tripping caused by external damage, and elevated the overall safety and reliability of transmission line operations.
　　In 2016, the company’s localized operations identified and prevented a total of 115 cases of unauthorized construction activities that could jeopardize the safe operation of power lines. All such incidents were addressed by signing construction protection safety agreements and establishing risk-control records for ongoing monitoring and follow-up. Additionally, 5,766 tree-related hazards were inspected, resulting in the removal or pruning of 6,022 trees. A thorough check was conducted on 724 specialized vehicles, with dedicated contact files established for each. The company also sent out 1,448 promotional text messages aimed at protecting power lines, eliminated 2,865 instances of greenhouse film hazards, painted 26,896 awareness slogans, and affixed over 5,000 warning stickers on greenhouse films—ensuring the stable and secure operation of the power grid.