In order to cope with a new round of low temperature, rain, snow and freezing weather, the Hubei Provincial Electric Power Department has set up more than 200 emergency ice observation posts on key transmission lines, and organized 1An emergency repair team of more than 90,000 people ensures the safe and stable operation of electricity.
At around 9 p.m. on February 20, rain, snow and freezing weather caused a 10,000-volt power line in Shengkang Town, Gucheng County, Xiangyang City, to burn down, affecting the electricity consumption of more than 1,200 households in three local villages. The emergency repair team of the power department was dispatched urgently, and after about 3 hours of emergency repair by 10 staff, the normal power supply was restored at about 12 o'clock that night.
In Dajia Town, Tongshan County, Xianning City, power workers have been cleaning up tree branches that endanger the safety of the line in the past two days and eliminating potential safety hazards in a timely manner.
In the Mulan Mountain Scenic Area of Wuhan City, freezing rain has bent many trees in the scenic area, and several of them are close to a 10,000-volt power line that supplies electricity to 3,000 surrounding residents. The emergency repair personnel immediately rushed to the scene to deal with the tree barrier and eliminate the potential safety hazards.
The UHV line involves the electricity consumption of nearly 10 million people, and the safety of the main network is of paramount importance. State Grid Hubei Ultra High Voltage Company carried out uninterrupted inspection and duty in the icing area, de-icing and melting ice in a timely manner, and ensuring the safe operation of the large power grid.
Huang Junjie, senior engineer of State Grid Hubei Electric Power Research Institute: "When the icing is in a relatively high-risk situation, we can take such as mobile DC ice melting or fixed DC ice melting, as well as the use of drones for mechanical de-icing or the use of DC transmission lines to reduce the voltage of the operation, to eliminate the hidden danger of icing." ”
Although the Hubei electric power department has added an icing monitoring device on the transmission line in key areas for 24-hour real-time monitoring, the accuracy of the device has been reduced in local fog and extremely cold weather, and manual measurement is necessary.
State Grid Xiaogan Power Supply Company Transmission and Inspection Branch Operation Inspection Personnel Huang Yang: "Wind speed 116 meters per second, temperature minus 5, humidity 906%, it's too windy. ”
In order to ensure the stable operation of electric power, the Hubei electric power department has set up 218 artificial ice observation posts in key areas. The artificial ice observation whistle is generally set up at the top of the mountain, and the staff needs to be equipped with anti-skid equipment in the weather of low temperature, rain and snow, and walk to the ice viewing point.
Huang Yang, an inspection officer of the power transmission and inspection branch of State Grid Xiaogan Power Supply Company: "We have to go to the freezing point every 3 hours to conduct a real-time observation, and prepare the on-site data to reflect to the rear command, providing an important basis for decision-making on whether to melt ice in the future." ”
Low temperature, rain and snow also make the safe operation of the power grid face a severe test. Employees of State Grid Shandong Binzhou Power Supply Company braved the cold wind and heavy snow to carry out special post-snow inspections on important transmission lines such as transmission channels and record relevant operation data.