Overhead transmission lines and underground cables are the two primary methods for long-distance power delivery, each with distinct advantages and disadvantages that influence their application.

Overhead transmission lines

overhead lines, supported by towers or poles, are the most common method for high-voltage transmission.

• Advantages:

  • Cost-Effective: They are significantly cheaper to construct and maintain.

  • Easier to Repair: Faults are easier to locate and repair, leading to shorter outage times.

  • Better Cooling: The conductors are exposed to the air, which allows for natural cooling and higher current-carrying capacity.

• Disadvantages:

  • Visual Impact: They can be considered aesthetically unpleasing and require a large right-of-way.

  • Environmental & Safety Risks: Susceptible to damage from extreme weather (wind, ice), lightning, and wildlife, posing risks of power outages and safety hazards.

underground Cables

underground cables are typically buried beneath the ground, often used in urban areas or sensitive environmental zones.

• Advantages:

  • Aesthetics: Minimal visual impact, preserving the landscape.

  • Reliability: Less vulnerable to weather and external damage, offering a more stable power supply.

  • Space-Saving: Requires a smaller footprint on the surface.

• Disadvantages:

  • High Cost: Construction is very expensive due to the need for extensive trenching and specialized insulation.

  • Difficult to Repair: Locating and repairing faults is complex, time-consuming, and expensive, resulting in longer outages.

  • Thermal Constraints: The surrounding soil acts as a thermal insulator, limiting the cable's current-carrying capacity compared to overhead lines.

At Ningbo Changshi, our expertise lies in both types of projects. We provide specialized Overhead Transmission line equipment and Underground cable laying Equipment to meet the specific requirements of each method, ensuring our clients have the right tools for a safe and efficient installation, no matter the project.