1. Medium voltage overhead line or overhead medium voltage line
An overhead medium voltage line is a network of electric poles and wires connected to each other above ground level. In Vietnam, it is used to transmit medium voltage power up to 35 kV to supply distribution transformer stations that convert the power down to low voltage.
The overhead line consists of electric poles with cross arms and wires that are hung on the cross arms using insulators. The poles are anchored in the ground with strong concrete foundations, supporting the high wires above the ground, hence it is called an overhead line.
The poles can be made of reinforced concrete
The poles can be made of reinforced concrete with or without prestressing, or steel, and have different functions, including anchor poles, support poles, end poles, and crossing poles. The wires are usually made of copper, aluminum, or steel-core aluminum, and come in different types such as single wires, homogeneous twisted copper wires, and twisted steel-core aluminum wires.
The distance between two points where the wires are hung on two adjacent poles is called a span, and when the line passes over obstacles, it creates a clearance. Pulling the wires on the overhead medium voltage line during construction is a crucial process in building this system.
Cột điện có thể được làm bằng bê tông cốt thép dự ứng lực hoặc không, hoặc bằng thép, và có nhiều chức năng khác nhau, bao gồm cột néo, cột đỡ, cột cuối và cột vượt. Các dây dẫn thường được làm bằng đồng, nhôm hoặc nhôm lõi thép và có các loại dây khác nhau như dây đơn, dây vặn xoắn đồng nhất và dây vặn xoắn nhôm lõi thép.
Khoảng cách giữa hai điểm treo dây trên hai cột kề nhau gọi là khoảng cột, và khi đường dây vượt qua chướng ngại, ta có khoảng vượt. Thi công kéo dây trên đường dây trung thế trên không là quá trình quan trọng trong việc xây dựng hệ thống này.
2.The purpose of using an overhead medium voltage line
An overhead medium voltage line is used to transmit electricity from medium voltage transformer stations to low voltage transformer stations, industrial areas, residential areas, and other construction sites. The medium voltage is used in transformer stations to supply power to low voltage transformer stations. After being supplied with power, this electricity will be converted to low voltage through a 35KV 22/0.4KV low voltage transformer to serve electrical equipment in construction sites, factories, or households.
3.Factors affecting the efficiency of an overhead medium voltage line
The efficiency of an overhead medium voltage line depends on many factors such as wind speed, lightning strikes, humidity, and ambient temperature. These factors can cause incidents such as wire breakage, pole damage, or power outage. Therefore, maintaining and repairing the overhead medium voltage line is crucial to ensure continuous and safe operation.
4.The importance of an overhead medium voltage line
The overhead medium voltage line is an important part of the power grid system and is used to transmit electricity from medium voltage transformer stations to low voltage transformer stations. Maintaining and repairing the overhead medium voltage line is crucial to ensure the continuous and safe operation of this system.
Quanganhcons provides services for erecting poles, pulling up to 35kV high-voltage overhead cables.
Construction video of overhead 22kV medium voltage power line at Long Hau Industrial Park, Can Giuoc, Long An
Readmore: Dựng cột điện BTLT bằng xe cẩu tự hành tại KCN Long Hậu
Quanganhcons provides services for construction of overhead medium voltage power lines up to 35kV, including installation of poles, and cable pulling. We have successfully completed numerous projects with a commitment to practical and effective solutions for our clients. Our team of skilled professionals and modern equipment ensures that projects are completed on time and to the highest quality.
At Quanganhcons, we prioritize our clients and offer optimal solutions to minimize costs and ensure safety during the construction process. Our expertise and reputation have earned us high praise from satisfied clients, and we strive to provide the best services at the most competitive prices on the market.
Contact us today for a free consultation and quote. Let Quanganhcons be your reliable partner for all your electrical projects.
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