According to a recent announcement by international market research firm Technavio, the global overhead cable market share is expected to increase by $17.67 billion from 2022-26, at a compound annual growth rate of 5.1% during the period.
One of the key factors driving the growth of the overhead cable market is the increase in renewable energy generation.
Overhead power cables are widely used to transmit electricity generated by power plants.
The increasing demand for shifting to renewable energy sources has led to an increase in the generation of electricity from wind turbines, solar energy, etc.
This has led to a demand for new installations of overhead cables.
From the current perspective, renewable energy is the fastest growing source of power generation.
Countries around the world are focusing on establishing clean energy projects such as solar and wind power generation.
Reducing the use of fossil fuels is stimulating the growth of the overhead cable market.
In terms of trends, the Gulf countries are expected to have a positive impact on this market during the forecast period.
The region is witnessing good economic growth with strong growth in sectors such as manufacturing, entertainment, tourism, and education.
It is contributing to the increased demand for electricity in the region, leading to an increase in the application of overhead cables.
Over the years, mega-city projects, modern infrastructure, increasing migration, and economic development are on the rise. These developments are expected to create demand for overhead power wires, which will drive the growth of the global overhead cable market.
During the forecast period, 34% of the market growth will come from the Asia Pacific.
China, Japan, and India are the major markets for overhead cables in the Asia Pacific region.
The market growth in this region will be faster than the market growth in other regions.
Growing population, rapid industrialization, urbanization, and higher living standards have led to increased demand for electricity in the Asia Pacific region.
This will contribute to the growth of the Asia-Pacific overhead cable market over the forecast period.
With the increase in the insulation rate of distribution overhead lines, the reliability of power supply to distribution lines is also increasing and the fault rate of the lines is decreasing.
This has effectively solved the poor tree line in urban greening and beautified the cityscape.
It also improves the utilization rate of the line channel. The generation of overhead cables is beneficial at present.
However, in recent years the installation and operation, found that overhead insulated lines suffer more lightning damage, the conductor is easy to enter the water oxidation, and other problems.
This has caused more accidents with broken wires.
In this regard, ZMS cable takes you to understand the overhead insulated line encountered some solutions to the problem.
1 More Lightning Accident
Overhead insulated lines suffered more lightning accidents than overhead bare wire, lightning damage is more serious.
Insulated wire after lightning strikes, often occurring point break type of wire break, the wire falls on the ground or other components.
Due to good insulation properties, not easy to produce a short circuit or grounding, but some have a discharge phenomenon.
This causes great danger to the operating equipment and the person.
Main causes
1.1 Insulated Wire Structure Due To
Insulated wire uses a semi-conductive shield and cross-linked polyethylene as the insulation layer.
The semiconductor material used therein has single conductor properties.
It is easy to generate induced overvoltage in the conductor of the insulated wire in the atmospheric overvoltage of the thundercloud discharge to the ground, and it is difficult to release along the skin of the insulated wire.
1.2 Electromagnetic Mechanism After Lightning Strikes
This will also cause lightning strikes to break more wires.
Overhead bare wire lightning strikes, causing flashover accidents. It is because the arc will slip along the wire under the electromagnetic force of the work frequency renewal current.
Insulated wire lightning breakage fault rate is significantly higher than the bare wire.
To prevent lightning accidents in low-voltage overhead insulated lines, take line overvoltage protection measures.
1.1.1 Metal Oxide Lightning Arrester
A lightning arrester is through the absorption of lightning discharge energy, limiting the distribution line-induced overvoltage, to achieve the purpose of protection. Its overvoltage protection performance is good and widely used in the overvoltage protection of electrical lines.
As the effective protection distance of lightning, arrester is limited, so in the whole line aerial insulated line, there is a problem of installation density of the installation of the lightning arrester.
1.1.2 Protection Gap
The protection gap is also known as the discharge gap.
This is a simple overvoltage protection measure.
That is, the charged conductor is induced on the insulated line, and the angular protection gap is generally used.
Therefore, the protection gap is not able to cut off the frequency short-circuit current after the lightning current.
It can only cut off the power by circuit breaker protection action, restore the insulation strength of the protection gap, and send power with reclosing cooperation.
1.1.3 Gap And Lightning Arrester with Protection
There are special products on the market.
Can also be calculated by selecting the metal oxide lightning arrester and air gap combination site installation.
However, its stability performance is subject to further verification in operation.
In addition, appropriate to improve the insulation level of insulators that can reduce lightning accidents.
However, the investment is higher, and the insulation with the processing is more difficult.
Strengthening the tower grounding, and reducing the tower grounding resistance, is also effective measure to reduce lightning accidents.
2 Into the Water Oxidation
Insulated wire due to its structure and installation conditions, results in easy access to water and does not volatilize.
When the insulation layer is ruptured or not capped, water through the capillary suction Hong role into the aluminum conductor, and knotted together in the low part of the arc droop.
Due to environmental pollution water with acidic, which will produce an oxidation reaction with aluminum to generate white powder.
This type of oxide in the role of the electric field to accelerate the corrosion of the wire.
The strength of the wire is reduced, and the phenomenon of drum belly, and even broken wire, shortens the life of the wire.
Caused by the main reasons of water
1 Broken Skin End for Blocking
Problems in the installation process, resulting in long-term water entry.
2 Poor Acceptance and Storage
Sometimes there are not made to seal the head processing.
Water in the field construction was found many times before the installation of the wire was oxidized.
3 Construction Reasons
For example, the operation process by external forces destroys the insulation layer in the water.
The main solutions to such problems are
1 Manufacturer should strictly be following the regulations design, acceptance, and carefully do a good job of waterproofing blocking, found device violations immediately rectified.
2 Strict product acceptance, proper storage, and sealing of the exposed head.
3 Strengthen operational monitoring, found stage drum belly phenomenon, immediately organize sampling and processing.
With the rapid growth of global demand for overhead cables, the products should be more strictly guarded and comply with the regulations.
The above is the solution to the problems encountered in the overhead insulated cable. ZMS cable company has been concerned about the development of the cable, always adhering to provide high-quality cable, good value for money, considerate service, the product through strict manual qualification audit, trustworthy.
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