The 500kV Chalong Line I and Line II are part of the Tibet-China Interconnection project, an ultra-high voltage power grid project with the highest average altitude and the most complicated construction conditions in the world. The project consists of the power grid interconnection project between Tibet and Changdu, Xizang, and the power supply project for the Lhasa-Nyingchi Railway. Starting from Mangkang County, Chamdo City, Tibet, and ending at Sangri County, Shannan City, it crosses ten districts and counties in three cities in Tibet, and after its commissioning, it can provide reliable power supply for 3070 small towns (central villages) and 1.56 million people along the route. Lhasa, Shigatse, Shannan, Nagchu and Linzhi areas covered by the project are the main load centers of the Tibet Power Grid. After the project is put into operation, it can solve the problem of power shortage in Tibet during the "13th Five-Year Plan" period. About 70% of the area of Linzhi City, Motuo County, Bomi County and Chashu County, will be included in the main power grid coverage, these areas of isolated network operation, voltage instability will be greatly improved.

In August 2020, our distributed fault diagnosis system for transmission lines was applied to the 500kV Chalon I and Chalon II double circuit lines. The system can quickly determine the fault interval, clarify operation and maintenance responsibilities, locate the fault point, guide rapid emergency repairs, effectively shorten the time of power outage due to line faults, reduce the loss of transmission capacity caused by power outages, and provide guarantees for the rapid recovery of power supply.

The Panlong Line project belongs to the 500kV Chongqing Hubei inter provincial power transmission and transformation project. It is a connecting line of the Sichuan Hubei power grid and an important channel for the West East power transmission, ensuring normal electricity consumption during the summer peak in central China.

Due to the complex environment, high towers and obvious climate change, the fault tripping of this line has increased greatly.In November 2015 our company's transmission line distributed fault diagnostic system was installed and applied.This system can realize line fault interval locations, fault locations, fault cause identification and lightning strike monitoring, which greatly improves the efficiency of line inspection, and provides a guarantee for the line's rapid restoration of power supply.

Part of the application line：

Ø750kV Mai Bao line I, II
Ø750kV Liangqian line I, II
Ø750kV Guowu line I, II
Ø500kV Chalong line
Ø500kV Lincha line I, II
Ø500kV Panlong line I, II
Ø220kV Huoba line I
Ø220kV Zhonghuo line II
ر660kV Yindong line
ر500kV Yongfu DC line
ر500kV Imu Line
ر500kV Ge'nan Line
ر500kV Longzheng Line
ر400kV Chaila Line