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Breakthrough! World-first ±1,100 kV live-line work carried out in Anhui
2025-10-28
Source：[Electrical & Electronics Network] News
Author：
On October 31, State Grid Anhui Electric Power employees successfully completed live-line work on a ±1100 kV ultra-high-voltage transmission line at an altitude of 111 meters in Nangang Town, Shucheng County, Lu'an City, Anhui Province. This milestone marks the official entry of live-line operations into the ±1100 kV voltage range.
According to reports, during the streamlined drone-based inspection, inspectors discovered a hidden defect—specifically, the pin of the line clamp at tower No. 5734 on the Jiquan Line—something that would have been difficult to detect through conventional manual inspections. If this potential hazard isn't addressed promptly, it could seriously impact the reliable operation of the transmission line.
At the work site, an operator wearing a specially designed high-voltage shielding suit was carefully maneuvered horizontally into position beneath the working point while seated in a suspended basket. Meanwhile, personnel on the tower immediately initiated a vertical lift, smoothly guiding the energized worker into the electric field. After completing the live-line maintenance task, the operator safely returned to their starting position—entirely within less than 50 minutes.
±1100 kV Live-Line Work
Leading this live-line operation was Wu Weiguo, the team leader of the Live-Line Work Team at Anhui Transmission & Transformation Engineering Co., Ltd. His team has repeatedly broken through multiple technical barriers in the field of ultra-high-voltage live-line work. "Since the Jundong-to-Wannan transmission line is the first ±1100 kV power line of its kind, there’s currently no operational or maintenance experience—domestic or international—to draw from," Wu Weiguo explained. "We had no choice but to start from scratch, steadily pushing forward with continuous technological breakthroughs." The ±1100 kV Jundong–Wannan UHV DC transmission project stands out as one of the most advanced and cutting-edge transmission systems today, boasting high voltage levels, substantial transmission capacity, extensive distances, and state-of-the-art technology. The project spans six provinces and regions—Xinjiang, Gansu, Ningxia, Shaanxi, Henan, and Anhui—covering a total line length of approximately 3,324 kilometers. It is capable of delivering an impressive 66 billion kilowatt-hours of electricity annually to the East China region.
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Henan Wanjin Electrical Equipment Co., Ltd.
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