Early in the morning of February 3, 10,000 acres of bamboo in Xingxing Village, Tingsiqiao Town, Xianning City, Hubei Province, were covered with ice and snow, and patches of ice-covered bamboos fell on the power supply line, affecting the normal operation of the line. State Grid Hubei Provincial Electric Power Xianning Power Supply Company "Hubei Electric Red Vest" immediately acted, they wore hard hats, raincoats, and firewood knives in their hands, and crossed the mountains to clean up the fallen bamboos and repair the power supply lines.
In the past few days, rain, snow and freezing weather have invaded Hubei, the cold wind is howling, the earth is paved with white, and the bamboo and wood are hung with ice. The Hubei electric power department moved on hearing the order, climbed snow-capped mountains, climbed iron towers, cut down bamboo and tree barriers with chain saws, and manipulated drones to de-ice ...... in the airDuring the superposition period of spring transportation and rain and snow, we will make every effort to ensure the safety and stability of electricity**.
According to reports, the State Grid Hubei Provincial Electric Power ***2All 50,000 visualization devices are on duty, and the monitoring center is on duty 24 hours a day to monitor the icing situation of transmission lines in real time. For high-altitude and micro-meteorological areas, 230 personnel were stationed at sentinel sites to carry out special patrols for artificial ice observation. On February 2 alone, the power department carried out 1,221 special inspections of distribution lines and cleared 1,235 hidden dangers of tree barriers in line passages.
At about 3 o'clock in the afternoon of February 2, the members of the sixth class of the operation inspection of the power transmission and inspection branch of the State Grid Wuhan Power Supply Company wore "crampons" and climbed step by step to the top of the Qingliangzhai area.
The goal of this operation is to carry out drone de-icing on the icing of the 220 kV Min Feng 12 round 75 to 76 section of the ground conductor, and we should pay attention to the operation specifications and safety. Song Liang, the deputy squad leader of the sixth class of the operation inspection, explained the key points of the operation to the class members in the cold wind.
Song Liang introduced that according to the inspection and monitoring of the line in the past few days, the current icing thickness on this section of the ground wire is about 11 mm, and the state is relatively fluffy, so mechanical de-icing is adopted.
It can be done! Song Liang gave an order, and class member Wang Gang quickly controlled the drone to take off, carrying a depopsicle stick and flying towards the ground line of the target section. I saw that the drone instantly accelerated and dived, and the depopsicle slammed into the transmission wire. In an instant, the ice and snow on the wires fell like "blasts".
In addition to mechanical de-icing, there is also DC ice melting, that is, a controllable current is input to the transmission line conductor, and the current heating is used to increase the temperature of the conductor, so that the ice melts and falls off.
On February 2, at the southern foot of Dabie Mountain, at an altitude of 580 meters above sea level, Xiaochang County, Xiaogan City, the freezing weather caused the 110 thousand volt phoenix boundary to be covered with ice up to 12 mm, and the maintenance personnel rushed to the scene to de-ice.
Due to the icy and slippery road surface, the transport vehicles could not move even if they were equipped with snow chains, so the power supply staff could only find a large gear tractor to make multiple round-trips to send the construction personnel to the DC ice melting operation site. Hu Huazhi, the head of the urban operation inspection team of the substation operation inspection branch of the State Grid Xiaogan Power Supply Company, said that DC ice melting is more efficient and safer than manual de-icing, and can effectively eliminate the potential safety hazards of line icing in a catastrophic freezing environment.
It is reported that in order to cope with this round of rain, snow and freezing weather, State Grid Hubei Electric Power has set up 1,337 emergency teams with a total of 15,357 people on standby, established 14 cross-regional emergency repair teams of 940 people, 15 UPS power supply vehicles, and 1,515 emergency generators are assembled on standby to ensure the safe and stable operation of power.
This article was published in the 4th edition of Bright ** on February 4, 2024).