Gansu Economic Daily News (New Gansu·Gansu Economic Daily Correspondent Yi Mingxing) On November 25, Gansu Power Grid’s first ±800 kV UHV transmission line live work was successfully completed, filling the gap of Gansu Power Grid’s lack of ±800 kV live work It has realized the transformation of ±800 kV UHV live work in the province from practical training to actual combat and normalization, and accumulated valuable experience for the province's ±800 kV live work.
±800 kV Qishao UHV DC transmission line starts from Qilian Converter Station in Gansu Province and ends at Shaoshan Converter Station in Hunan Province. It is 2,383 kilometers long. It is the first UHV line in China that directly supplies power to Hunan. It is also the first UHV line in my country to directly supply power to Hunan. One of the main arteries for eastward transmission, it plays an active role in ensuring large-scale wind power and photovoltaic development and bundled delivery in Gansu energy base, and fully alleviating the power shortage in central China.
A few days ago, the line operation and maintenance personnel used a drone to conduct a detailed inspection of the ±800 kV Qi Shao line and found that the No. 3 sub-conductor on the side of pole 1456 in Gulang County, Wuwei City suspension clamp U-type bolt and nut was loose , if not handled in time, under the continuous action of strong wind and other conditions, the nut may come out, causing the sub-conductor and the clamp to break due to friction, which will cause serious safety hazards to the safety of the entire line.
html In November, as the temperature in Hunan gradually dropped, the transmission power of the ±800 kV Qishao line continued to increase, with the daily power transmission reaching 70 million kilowatt hours , and it continued to rise and approached the winter peak. If a power outage is used for maintenance at this time, the power outage will be required for at least 6 hours, which will cause a power shortage of 17.5 million kilowatt hours and the entire Hunan power grid will face a severe test. The company's electrification professionals conducted detailed on-site surveys, analyzed and calculated the working location, tower type, and safety distance, carefully compared the defect photos and ledger information, and determined that the equipotential electrification operation method should be used to eliminate the defects.On that day, the sky was clear and clear, which provided good conditions for live work. The on-site workers measured a temperature of 5 degrees Celsius, a humidity of 17%, and a wind speed of 2 meters per second, which met the conditions for live work. The live work team worked together and had a tacit understanding, and all preparations were carried out in a strict and orderly manner.
"The base tower is said to be 62 meters high. It requires a drone to carry a rope across the ground conductor accurately and fly to an altitude of 120 meters to complete the rope throwing operation. This requires a high level of control of the drone's flight controller . ....." said Wang Hui, the person in charge of the work.
At the scene, Zhang Haitao put on a one-piece shielding suit and wrapped himself in a "zero electric field" environment. Under the traction of the electric lifting device, he was lifted vertically into the equal potential just like taking an "elevator." This moment marked the "zero" breakthrough in Gansu Power Grid's ±800 kV UHV DC live operation, and the company's live operation area achieved full coverage of the province's ultra-high voltage transmission line voltage levels.
"Live work requires that workers must be of high quality and not panic when faced with arcs and discharge sounds. In addition, drones were used in this operation to conduct real-time safety monitoring of high-altitude workers to ensure that there are no safe corners during the entire operation." Live work requires Lu Qiang, deputy director of the technology center, said.
±800 kV UHV six-split wire compressed the space to the left and right of the operator to only allow the body to pass through. However, the operator Zhang Haitao has become accustomed to it. He can be seen moving quickly on the swaying wire like "waves and micro steps". Arrive at the work point through wiring to perform the defect elimination operation, and then return to the ground along the original route. The defect elimination operation is successfully completed. The whole process only takes 1 hour.
It is understood that live operation technology is an important maintenance method for UHV transmission lines, which effectively ensures uninterrupted and continuous power supply for UHV transmission lines. As a provincial live work center, the company's live work technology center continuously innovates work methods, improves work tools, overcomes the challenges brought by rising voltage levels and increasingly complex line operating conditions, and actively explores safer, more efficient, A more comprehensive live work mode, always stick to their jobs, wear shielding suits made of metal wires to work on million-volt high-voltage lines, and continue to ensure the safe supply of power this winter and next spring.
(Source: Gansu Economic Daily·Gansu Economic Network) [For submissions and regional cooperation, please send a private message or send a reply to 3469887933#qq.com within 24 hours. 】
