China News Service, Xining, August 28 (Li Jiangning, Xie Lirong, Dong Qingfang, Cao Xuangan) The reporter learned from the State Grid Qinghai branch on the 28th that on the afternoon of the 27th, at the Buha River in Tianjun County, Haixi Prefecture, Qinghai, at an altitude of 3348 meters, Net Qinghai Maintenance Company has completed the live line operation of 750 kV line. This is the first time that China has carried out 750 kV live line operation in an area above 3000 meters above sea level. It is the first in China for the line operation of the same voltage level.
The 750 kV Yuehai Line II for the live operation is an AC transmission project of the Qinghai-Tibet Interconnection Project. It is a transmission artery that runs through the east and west of Qinghai Province. It is also an important power source and long-distance transmission of new energy such as Qinghai DC. Collection channel.
According to reports, the company’s power transmission operation and maintenance personnel discovered a component failure at the junction of the tower wire and the insulator string during inspections. If it is not handled in time, it may cause a disconnection accident, endanger the safe operation of the entire line, and affect reliable energy transmission.
Weng Gang, the leader of the second class of live work at the Power Transmission Inspection Center of State Grid Qinghai Inspection and Repair Company, said: “Only in Northwest China is China that has 750 kV transmission lines built, and there are less data for live work on transmission lines of the same voltage level. In plateaus above 3000 meters. In regions, due to the impact of the special climate and environment, live working on 750 kV lines has always been a problem."
In order to ensure the smooth implementation of the live operation, the company comprehensively analyzed the existing dangerous points and formulated pre-control measures. After intense and full preparations, the successful implementation of the 750 kV live operation in high altitude areas above 3000 meters was finally realized.
According to Weng Gang, the person in charge of the live work: “The live work of 750 kV transmission lines in high altitude areas has high safety protection requirements, high risks for operators, and high voltage levels compared to low altitude areas and lower voltage levels. The problem of high insulation requirements for appliances."
"In the future, we will also study and carry out live operation technology for ±400 kV or even ±800 kV DC transmission lines in high-altitude areas to further enhance the power grid operation and maintenance capabilities." said Chen Dekui, director of the power transmission maintenance center of the State Grid Qinghai Maintenance Company.
It is reported that the live operation reduced the power outage time of the line by about 8 hours and reduced the power load loss by more than 7 million kilowatt-hours. (Finish)