Overhead cables will be replaced in cities and underground cables will soon be on the rise

BMA will replace the overhead cable project with an underground cable project

The incidence of accidents and failures in overhead lines is much higher than in underground cables, by a factor of about 10.

Isolated overhead lines in cities lack both aesthetics and safety.

In 1998, RTE France set itself the objective of laying a quarter of the new high voltage lines of the year 63kV-150kV underground.

Over 90% of the city’s new wires and cables directly into the ground at scale

Underground cables, a trend of the new century with the rapid development of urban economy and the improvement of urban quality of life.

SAN FRANCISCO, USA, Aug. 18, 2022 /EINPresswire.com/ — BMA May Cancel Plan to Relocate All Overhead Cables Underground
The Bangkok Metropolitan Administration (BMA) may cancel the plan to relocate all overhead and telecom cables underground. Indeed, most telecom service providers shunned the project due to its high capital cost, estimated at around 19 billion baht.

Bangkok Deputy Governor Wisanu Subsompon said that at this stage the city government had given instructions to its investment department because telecommunications service providers had shown little interest. Krungthep Thanakom, the project owner, slowed down the work.

If the project is to be completed, the city expects the telecommunications regulator, the National Broadcasting and Telecommunications Commission (NBTC), to share the costs as well, he said.

So far, the BMA has laid 7.2 kilometers of underground power cables covering some roads in Bangkok. The cost is estimated at 140 million baht, but the total distance of overhead cables in the capital is about 2,450 kilometers.

Meanwhile, the Metropolitan Electricity Authority (MEA) has placed its cables separately in underground cable ducts for a total distance of 62 kilometers. Work on another 12 kilometers of road should be completed this year.

He plans to ask the Cabinet within the next five years to move the cables a distance of 77.3 kilometers, after which all poles will be removed.

The cable project is one of BMA’s ambitious plans to beautify Bangkok’s environment by removing cable barriers.

So why are more and more cables being placed underground?

Underground cables are a new trend in the new century with the rapid development of urban economy and the improvement of the quality of urban life. It has and will have a beneficial effect on the beautification of the urban environment and the enhancement of the functions of the city, and has a new reality effect. The underground cable should and can reflect the high level of overall socio-economic development of a city, and can also measure the high degree of modernization and scientific development of a city.

International experts in urban cable research, through decades of scientific exploration and construction practice through the centuries, have obtained convincing empirical conclusions, and the ZMS cable expert team has summarized the cable Underground following modern urban development has brought many benefits.

1. Underground cables improve the reliability of urban power grids
With a large number of towers in the city exposed by the roadside, you cannot avoid the traffic accidents on the overhead lines, and it will also often happen that the crane hits the line, the air throw, the line of kite suspension and other external damage, most likely during storms, heavy snowfalls and other catastrophic weather conditions caused by severe damage to the power and communication network, on such loss of cables and accidents, lead almost directly to the interruption of power and the rate of disconnection of communications.

For example, France experienced a violent storm in December 1999, which led to the serious failure of 8% of high and very high voltage transmission lines, power outages lasted 15 million customer days, while all lines were repaired but took 6 months, total losses of up to 1.3 billion euros.

In Hangzhou, China, there was also a severe typhoon in August 1988, which caused a large number of trees to fall on overhead lines, causing cable lines to break, causing a blackout. massive electricity loss in the Hangzhou area for more than 10 days, with considerable losses.

Generally speaking, the incidence of accidents and failures of overhead power lines is much higher than that of underground cables, about 10 times higher. Therefore, the use of overhead lines in the city ground is very necessary, but also particularly important, underground cables are fully available to the city to bring power supply reliability, security more worry-free.

2. Underground cable can improve the transmission capacity of urban lines
Usually overhead transmission lines to another tower, but buried underground cable lines can reach many circuits. Additionally, underground high-voltage cables typically have more efficient copper conductors, making them efficient at transmitting electricity.

Additionally, underground UHV cables mostly have more efficient copper conductors that can operate at lower temperatures than overhead transmission lines. This feature helps achieve the most efficient delivery of electricity to end users and is particularly important for renewable energy generators and low carbon generators over long distances. It can make a valuable contribution to reducing greenhouse gas emissions by reducing losses in the transmission of this energy.

3. Underground cables can eradicate visual pollution and beautify the urban environment
The huge cobweb of urban overhead lines largely destroys the aesthetics of the city, destroying the visual effect of traditional and modern buildings. Aerial line in the ground, you can make the city pure, let visual people produce a sense of comfort and beauty.

4. Cable buried in the ground can improve the utilization of urban land value
Land is a valuable but scarce resource, especially in the center of first-tier cities. Due to the spatial safety distance of the overhead line, the requirement is higher than the underground pipeline, which decreases the use value of the land, but going underground can increase the use value.

5. Avoid more dangerous accidents
Taking the path of the buried, can better decrease dangerous accidents and avoid pole accidents, resulting in personal safety accidents.

Based on the strong development of underground cable construction in cities around the world and the many advantages of underground cables for modern urban development. ZMS predicts that more and more countries will increase their underground cable laying efforts in the coming decades. More countries will proactively participate, thus triggering a series of a boom in underground cable construction.

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How to make a quality underground or aerial cable?

Bonny J. Streater