How to deal with the problem of frozen transmission and distribution lines

For alpine areas with severe cold weather, freezing seriously affects the safe operation of power transmission lines and distribution lines. The harm caused by freezing increases maintenance workload, increases enterprise costs, reduces power supply revenue, and effectively avoids and prevents freezing. The harm caused to transmission and distribution lines is a topic that enterprises have to pay attention to.

Measures for Freezing of Transmission and Distribution Lines

• 1. Improve engineering design standards and focus on engineering construction quality

For the transmission lines spanning high mountains and ridges, the design and construction should be carefully controlled: first, the wind speed and the thickness of the ice cover should be carefully verified, and the conservative design should be adopted as much as possible, and the design should be designed according to the strong ice and snow weather that occurs once in 30 years at least; The second is to use super-strengthened conductors, insulators and hardware should consider strong tensile strength, and iron towers should be short, tensile-resistant and reinforced; the third is to reduce the span, set up more tension-resistant sections, and use more tension-resistant towers. Minimize the accident area and prevent accident expansion; Fourth, pay attention to the quality of wires, insulators, hardware, towers, and cables to ensure that the design stress requirements are met; Fifth, pay attention to the pouring of the tower foundation and the wire sag to be constructed in strict accordance with the design. After the line of the 110kV bridge in Hefeng County was broken down three times, the climatic conditions of the line were carefully verified and the cause of the accident was analyzed. The accident section was redesigned and transformed: the ordinary self-supporting tower was changed to The reinforced corner tension tower reduces the height of the tower, increases the tension section, and shortens the distance of the tension section; increases the tower position on individual larger spans to reduce the tensile load of the single-base tower. After the above treatment, in the spring ice disaster of 2005, there was no tower collapse and disconnection accident on this line, and the effect was obvious. power cable

• 2. Line erection to avoid alpine tuyere and forest area

In winter, the ice accretion at the alpine tuyere is relatively thicker. Whether it is daily maintenance, line accident rate, or emergency repair, the alpine tuyere will bring many disadvantages to the work; and the forest area will bring more harm to the corridor cleaning. resistance, it is also more likely to cause a large area of tower (rod) disconnection.

• 3. Do a good job in corridor cleaning

Corridor tree barriers are the main factor affecting the safe power supply and use. Strengthening the cleaning of corridors and the clearing of tall trees on both sides of the corridor can effectively prevent freezing weather and trees from overturning on wires and towers.

• 4. Strengthen maintenance and governance

Careful and meticulous maintenance and management: such as the adjustment of the pull wire, the firmness of the steel wire clamp bolts, the inspection and replacement of the pull wire insulator, and the adjustment of the wire sag, etc., can avoid the occurrence of part of the tower (rod) disconnection accident.