-
About UsHongsheng Wire and Cable Co., Ltd. is a key enterprise in Zhejiang Province specializing in the production of wires and cables, integrating industry, commerce, trade, production, education, and research. Its main production, processes, and testing equipment are all designed and configured according to international standards.
-
ProductsEmploy scientific management and quality assurance systems based on GB/T19001—IS09001 and GB/T24001—ISO14001 environmental management systems to organize production management.
-
-
Contact UsWe believe: Great achievements depend on quality. Your satisfaction is our eternal pursuit!
18
2021
-
05
Why are some wires not covered with insulation?
You may have noticed that some power lines are bare! So will such power lines cause electric shock? In fact, "bare" high-voltage lines are very common, and industry insiders call them "bare wires." However, since someone asked, we think it is necessary to explain it again. Why do some high-voltage power lines "run naked"?
You may have noticed that some wires are bare! So, will such wires cause electric shock? In fact, “ bare ” high-voltage lines, are very common, and industry insiders call them “ bare wires ” .
Why are some high-voltage wires wires “ bare? ”。
You need to know ——
The reason insulation can insulate is that the materials used to make the insulation offer significant resistance to current. Direct current cannot pass through, so it will not conduct to the human body. When alternating current passes through the insulating material, capacitive current is generated. Since the charge passing through is negligible, it is usually considered non-conductive.
Why can high-voltage lines be bare?
Whether or not a wire should be insulated is closely related to the voltage level. Generally speaking, 10 kV high-voltage lines above do not have insulation. The reasons are as follows:
1. Insulation is very limited against high-voltage currents.
When the voltage suddenly increases due to weather or line faults, the damaged insulation no longer insulates.
2. Insulation will increase wires the weight.
To ensure that the insulation works even at very high voltages, a relatively high thickness is required. Imagine how thick the insulation layer on the wire would be, which would put a great burden on the line. After the conductor becomes heavier, more towers are needed to bear the weight, which will greatly increase the construction and maintenance costs of the line.
3. Excessive insulation is not conducive to wires heat dissipation.
Wrapping with thick insulation will affect the heat dissipation of high-voltage lines. Poor heat dissipation will increase energy consumption and increase costs invisibly.
In the power transmission and distribution system, there are two lines: transmission wires lines and distribution lines. They have insulation, generally distinguished as follows:
Transmission lines
In order to reduce the loss during power transmission, transmission lines are usually 10 kV high-voltage lines above. It can be seen that the “ pressure ” on transmission lines is not ordinary. Due to the high voltage, such high-voltage transmission wires lines usually do not have insulation.
Distribution lines
Distribution lines have low-voltage distribution wires lines and high-voltage distribution lines, used to directly deliver power to electrical equipment. Urban areas and 10 distribution lines below 1000 volts will be covered with insulation to prevent residents from electric shock. High-voltage distribution lines built in remote mountainous areas and open areas generally do not have insulation.
Wire
Previous Page
Guangzhou Baiyun International Airport
2017-09-13
2017-09-13
2017-09-13
2017-09-13
2017-09-13
2017-09-13
2017-09-13
2021-04-13
Contact Us
Service Hotline
Address: Central Industrial Park, Luqiao District, Taizhou City, Zhejiang Province
Fax: 86-576-82670077
