With the invasion of the cold wave, the temperature in Shenyang has plummeted in the past few days, and on the morning of the 20th, the temperature approached minus 25 degrees Celsius.
At this time, nearly 30 meters underground, Sun Chongyang, the leader of the first shift of the cable work area of the State Grid Shenyang Power Supply Company, and his colleague Zhang Yibin are holding tools to carefully inspect the cable tunnel step by step to ensure the stable operation of the transmission cable and silently guard the "artery" of urban power.
The 220 kV Shengjing-Pangjiang cable tunnel where they are located is buried deep under the bustling and noisy city of Shenyang, and is built using shield technology, and this power "artery" is 554 kilometers, completed and put into operation in July 2022, increased the power supply capacity of the eastern part of Shenyang from the original 1.5 million kilowatts to 3.5 million kilowatts.
We are typical 'underground workers', walking more than 10 kilometers along the cable tunnel and walking nearly 30,000 steps. Sun Chongyang smiled and said to reporters, "Recently, the weather has been cold, the load on the power grid has increased, and the 'burden' of equipment has also increased, so we must increase the frequency of inspections." ”
Crews inspect the cable tunnel. Photo by Xinhua News Agency reporter Liu Yichun.
Walking into the Shengjing-Pangjiang cable tunnel, the reporter saw that the tunnel was divided into two cabins, with three black cables on each side and a cable joint every 500 meters or so. "The joint is the focus of the inspection, and it is necessary to be alert to grounding faults. Sun Chongyang said. They inspected every cable joint and grounding box in the cable tunnel from time to time, and measured the oxygen content and temperature in the tunnel with gas detectors, infrared thermometers and other instruments.
220 kV sheng line, the temperature of the equipment is normal, and the operation is normal. While testing, Sun Chongyang fed back the real-time detection situation to the team members of the ** monitoring command center.
During the inspection, Sun Chongyang and Zhang Yibin met with the "old buddy" inspection robot.
The staff checks whether the functions of the intelligent inspection robot are good. Photo by Xinhua News Agency reporter Liu Yichun.
Zhang Yibin told reporters that there are 3 inspection robots and 1 fire alarm robot in the tunnel, which can help them anchor risk points and build a bridge of communication between aboveground and underground power workers. "The remote end of the robot helper is the ** monitoring and command center, and once a power hazard is found, they will send out real-time alerts. Zhang Yibin said.
The staff inspects the intelligent inspection robot. Photo by Chen Long.
The cable tunnel is buried deep underground, with a constant temperature all year round, and people do not feel cold in it, Sun Chongyang and Zhang Yibin repeatedly squatted down and stood up during the inspection, and after a while, beads of sweat appeared on their foreheads.
Rather than hot and cold, overcoming loneliness and boredom and always maintaining a high level of mental concentration is the difficulty. Under the tunnel where there is no mobile phone signal, the inspectors should always pay attention to the fixed inner line and maintain contact with the ground. Sun Chongyang said frankly, "Every day, I have to walk up and down the cabin for 6 hours, and I have to cheer up 120,000 points of spirit every minute and every second." ”
Workers inspect the cable routes. Photo by Xinhua News Agency reporter Liu Yichun.
At around 3 p.m., Sun Chongyang and Zhang Yibin finally finished their inspection and returned to the ground. After packing up their tools, they climbed the steep slope and continued to the next patrol point ......
On this day, Liaoning Shenyang Power Supply Company dispatched 29 inspection personnel to carry out temperature measurement and current measurement on 13 transmission cables in the city, and accurately grasp the operation of equipment.
Twilight has arrived, and the "arteries" of urban power are in the cold wave, under the snow, and under the protection of power workers, safely and stably "shining and heating", guarding the bright lights of thousands of households. (Reporter Yu Yetong, Liu Yichun).