When the cold wave comes, why do they "not wear clothes"?

Recently, many places in China ushered in the strongest cold wave in the second half of the year, this round of cold wave has a wide impact, long duration, severe cooling, and strong rain, snow and windy weather
in some areas.
For this reason, people are immediately wearing thick clothes, including autumn pants, etc.
, and even pets are wearing warm clothes, and this is all to better resist the cold, after all, the more clothes are worn thicker, the higher
the frost resistance.
In addition, in order to resist the negative impact of the cold wave, all localities have also continued to increase cold and frost prevention measures to minimize losses as much as possible and ensure the stability
of people's lives.

However, not all objects are afraid of cold, need to do a good job of warmth measures, some objects can be used normally regardless of the cold and heat, even in the cold winter is not afraid of wind and cold, the cold power can be called explosive, such as overhead lines
.
Unlike common wires and cables, there is no insulation sheath outside the overhead line as protection, which is equivalent to "no clothes"
.
Why can overhead lines operate normally in winter without clothes? This needs to start
with "clothes", that is, insulating leather.

Under normal circumstances, conventional wire products such as power lines are made of a layer of insulation skin as a protective layer, and its biggest role is to form a protective barrier between the human body and metal conductors to prevent people from electric shock and play a protective role
.
The principle is: the material used to make the insulating skin can form a large resistance to the current, and the current cannot pass through this layer of resistance, it will not be conducted to the human body, so that no electric shock accident
will occur.
At the same time, the insulation skin also has the characteristics of ultraviolet resistance, aging resistance, excellent water resistance, etc.
, and can operate
for a long time in various environments.
This is the advantage of
insulating skin.

So why is the overhead line "not dressed", that is, the insulation skin is not used? Mainly because the current high-voltage transmission line transmission voltage is mostly above 10kV, some lines of voltage as high as 100kV, 500kV, if you want to give such a line insulation layer, the thickness of the insulation layer of ordinary wires is far from enough, on the contrary, it will bring a series of problems, such as weight increase, cost rise
.
If the thickness of the insulation skin increases, then the weight of the entire line will also be greatly increased, in order to support the line, it is necessary to build more towers, which not only greatly improves the difficulty of installation and construction, but also greatly increases the construction and maintenance costs of the line
.

In addition, the use of insulation skin for overhead lines is not conducive to heat dissipation
.
If the insulated wire is used for the line of 110kV and above according to the requirements, it will lead to a very large thickness of the insulation layer, so that the heat dissipation of the high-voltage line will be greatly affected
.
If the heat dissipation effect is not good, it will increase the consumption of electric energy, and if you want to reduce the heat, then you can only reduce its current carrying capacity, but once you do this, it actually increases the cost and the gain is not worth the loss
.

Because of this, overhead lines do not have to "get dressed"
.
Of course, there is no need to worry
about security.
According to the national technical specifications, the erection of high-voltage transmission lines must keep the wires away from the ground or buildings, and their distance is at least a few meters or even tens of meters away, so there is a spatial distance
filled with air between the transmission line and the ground or buildings, as well as where people may appear.
And the air itself is a good insulator, in general, there is no need to wrap any other insulator, as long as a certain spatial distance is maintained, the air can play a good insulating role
.
As long as people maintain a safe distance from high-voltage lines, personal safety can be fully guaranteed, so safety is not a problem
.

In addition, it is also important to choose a suitable product, which can not only reduce the later maintenance costs, but also greatly reduce the incidence of electric shock accidents and double the safety
.
As a leading enterprise in the cable industry for 36 years, Far East Cable has extremely rich experience in product research and development, through independent research and development to upgrade product performance, developed a new type of overhead energy-saving conductor, so that the transmission capacity of the conductor increased by more than 1.
5 times, the arc characteristics and heat resistance of the conductor increased significantly, becoming the main supplier of the State Grid
.

At the same time, Far East Cable also actively carries out the research and development and production of UHV conductors, and has successively developed 1250m㎡ series large-section wires, steel core high conductivity aluminum stranded wires, aluminum alloy core high conductivity aluminum stranded wires, carbon fiber composite core wires, aluminum tube supported heat-resistant aluminum alloy profile expansion busbars, ultra-high strength large span conductors and other products
.
These products adopt high conductivity conductor materials and advanced production technology, and have the characteristics of high altitude, large capacity, low loss and long-distance transmission, leading the development of intelligent cables in the field of
UHV transmission.

Choose high-quality wire products, even if the overhead line "does not wear clothes", there is no need to worry about safety issues, and it will not cause electric shock accidents
.
In the future, Far East Cable will continue to increase the research and development of wire products, strive to launch more energy-saving and capacity-increasing wire products, further improve the security performance of the power grid, and help the construction
of smart grid with timely and ultimate products and services.
(Wang Jun)