In the past, "electricity" was a luxury for the people of this land of China. Even if there is electricity, not every household can use it, and remote villages will not be blessed without pulling wires. In some places, electricity is widely available, but the cost is not low, and many people are reluctant to use it.
Time flies, and now 37 years have passed since we left our hometowns to receive electricity, and we can almost receive electricity in the wilderness and deep mountains and forests, as long as there are people. And this is inseparable from the high-voltage line that "flies" in the sky.
These wires often weigh several tons together, but how did they get up? Could it be that they were manually climbed up one by one?
High-voltage lines are erected to illuminate thousands of households
Those of you who live in the countryside should have seen high-voltage power lines, and usually on the hills far from the villages, you can see the towering hollow steel frames, which look like big iron towers.
The wires are pulled and covered by high-voltage lines, and then the straight poles in the fields are used to pull the wires to each household. It is precisely by relying on high-voltage lines that electricity can be used all over the country and illuminate thousands of households.
After a period when there was no electricity, I was able to feel the changes after the power was turned on. It also took a long time for the mainland to be able to electrify the townships.
Once upon a time, the technology of "electricity" was still in the hands of foreigners, and we had no way to explore and did not know how to have electricity, or how to achieve universal electricity after electricity.
In order to make every household have access to electricity, scientists are engaged in research, just to break down technical barriers.
In the 90s of the 20th century, power transmission from west to east began. The western part of the mainland is rich in natural resources, and the flat and open terrain is the most suitable place for power generation, while the coastal areas in the southern part of the mainland are mostly hilly and densely populated, but the demand for electricity is greater. If you want to complete the power transmission over long distances, the only way is to pull the cable.
Electricity is divided into alternating current, direct current, after research scientists have found that the transmission of high-voltage electricity above 10KV to various places, the use of three-phase three-wire is the most suitable, and high-voltage direct current, the use of two-phase system is more suitable, so only two wires are used.
The wires carrying high-voltage electricity are laid through the transmission towers, and the lightning rods are installed on the towers, and insulators are installed between the transmission wires and the wires, which are made of glass or ceramic materials, and 7-8 insulators are usually used for 110KV. Each transmission tower carries the mission of electric transportation and brings light to thousands of households.
From a distance, the high-voltage power line doesn't seem to be very large, but if you get closer, you can see that it is very large and tall. Standing in front of the transmission tower, human beings seem extraordinarily small.
Do you know that the high-voltage lines that stretch out weigh tens of thousands of tons! How do such heavy high-voltage lines get to the transmission racks?
How is a high-voltage line of tens of thousands of tons built?
In the era when technology was not developed, people were the only labor force, and they could only rely on workers to transport the required equipment to the mountains or even cliffs little by little, and then erect them. Sometimes it can take weeks or even months to erect a high-voltage line.
With the development of technology, the power of technology has gradually come into play, and it can be done using large machines. However, the details of wire erection still need to be done manually, and workers will do a good job of protection and climb to a shelf dozens of meters high to complete the line construction.
At the top of this hill, some people pull the wires, and the other part pulls the wires to go forward, and when they encounter obstacles such as houses and trees, they use the most primitive method, and take a fork to pick up and cross over. Finally, the line is pulled up with professional equipment and then laid.
The route for laying circuits in the mainland is very long, the environment is also very complex, and the difficulty of laying is also great, and the workers who build high-voltage lines are very hard. Gradually, the mainland developed flying paramotors, which were relied upon to lift wires into the air instead of manual handling.
However, paramotors also have drawbacks, such as thread entanglement when encountering strong winds, which can occasionally threaten the safety of workers or affect progress.
To solve this dilemma, drone technology began to be used. A drone weighs about dozens of pounds, uses multiple drones to fly together to bring the line to the air, and finally uses manual traction to complete the installation. Not to mention, the use of drones has greatly reduced the difficulty of construction, and the construction is getting faster and faster.
Drone technology is not only used in the pulling of wires, but also in aerial surveys. Surveys are carried out using drones prior to construction, which is cost-effective and flexible. They are able to use high-resolution imagery in mountainous areas with complex road environments to provide data support for different phases.
Before the design and construction of the line, the data acquisition can be completed in high mountains, large spans, uninhabited areas and other places, which can effectively improve work efficiency and design routes.
If the terrain along the construction line is complex, drone aerial photography can be used to build a three-dimensional digital system, which can intuitively feel the road conditions, environment and cross-crossing simulation. During construction, it can be cleaned up and verified, and if there is stagnant water, no safety fence, no safety helmet, etc., it can be accurately inspected and supervised.
After the construction of the project, it is also possible to use drones for acceptance work and digitalization, and it can be said that the use of drones plays a crucial role in the whole project.
Although there are only two people behind the "electrification", there are countless people working hard behind it.
China's UHV technology is leading the world
The major breakthrough in the electrification of the mainland is inseparable from the efforts of scientific researchers, and the road is also very difficult, and we have not completely overcome the technical problems in 2000.
In 2005, the mainland's "Guiguang Second Round" started construction, which was the first direct current project, and the transportation of high-voltage electricity up to 500 thousand volts began to undergo a transformation.
At that time, the members involved were nervous, for fear of accidents. Fortunately, our construction was very successful, and hundreds of technical problems that took three years to overcome were not in vain.
In the same year, the mainland began to develop 800 kV high-voltage direct current transmission technology, when the whole field was blank, the research team in order to overcome the problem of 24-hour shifts, spent a full 5 years, and finally built the world's first 800 kV high-voltage transportation project!
The continent is vast and has a wide range of power laying, but we are the only country in the world that has no obstacle to power transportation, whether it is high temperature or freezing weather, and we are the only country that will not have large-scale power outages, which even the developed United States cannot do.
The mainland has been accelerating the construction of new energy, and with the increasing demand for electricity, UHV flexible DC transmission technology has also come into being. After years of development, the continent's UHV technology has made a qualitative leap, and Kunliulong DC has won 19 world firsts in one fell swoop.
Today, we can proudly say that China's UHV technology deserves to be the first in the world.
Electrician, escort for the safety of electricity
The mainland has a huge demand for electricity every day, but it rarely encounters large-scale power outages, because electricians are there to protect us every year.
In the heat of nearly 40 degrees, dozens of vehicles patrol every day to check the power situation. In the mountains of Guangdong at an altitude of 300 meters, it is common to see dozens of workers of the Electric Power Bureau shuttling through the air like "Spider-Man" to carry out maintenance work.
They wore uniform clothing, wore hard hats and gear and walked a tightrope in the air, and they couldn't help but worry about them. Some of these high-voltage wires are about 50 meters high, and some even reach hundreds of meters, and people who are afraid of heights are absolutely not qualified for this job.
In the heat, they had to walk between the lines to inspect the work, sometimes covering only 900 meters in two hours.
When it rains and snows, they need to ensure a stable power supply. Rain and snow may cause power lines to be covered with thick ice, which is a safety hazard, so it is necessary to conduct patrols once a day to ensure 24-hour operation.
At the same time, each region is equipped with an emergency repair team, including emergency repair personnel, vehicles, various emergency supplies and so on. In the event of a power outage and other emergencies, they will immediately set off to complete the emergency repair as soon as possible to ensure the safe passage of electricity.
Without them, we would not be where we are today, let us pay tribute to the infrastructure team and the power workers who work hard in the front line!