What is the difference between OPGW and adss?

05 Feb.,2024

 

What is the difference between OPGW and ADSS?

When it comes to overhead power lines, there are two commonly used types of optical ground wire (OPGW) and all-dielectric self-supporting (ADSS) cables. Although both serve the same purpose of transmitting data and providing ground return path for the power system, they differ in various aspects. Let's delve into the key differences between OPGW and ADSS cables.

1. Construction and Design:

OPGW cables consist of a central steel or aluminum tube surrounded by fibers and coated with layers of protective materials. The metallic component provides the necessary mechanical strength and also acts as a grounding conductor. In contrast, ADSS cables are entirely non-metallic. They are composed of aramid fibers or glass yarns for strength, with optical fibers integrated into the core. ADSS cables are designed to be lighter and more flexible, allowing for easier installation.

2. Mechanical Strength and Span Length:

Due to the presence of a metallic tube, OPGW cables possess excellent mechanical strength, making them suitable for longer spans and heavier installations. The steel or aluminum tube ensures that these cables can bear the weight of ice, wind, and other environmental factors without sagging or breaking. On the other hand, ADSS cables have lower tensile strength, limiting their use to shorter spans. However, ADSS cables are perfect for areas prone to strong winds, as their lightweight nature helps in reducing stress on supporting structures.

3. Electrical Performance:

OPGW cables are designed to have a specific electrical impedance that matches the power system to ensure effective grounding. The metal sheath allows for direct bonding to the tower or pole, enhancing electrical performance. On the contrary, ADSS cables are not designed for grounding purposes. Their non-metallic construction makes them an insulator against electrical current. Therefore, ADSS cables are used in areas where electrical grounding is not required or separately provided.

4. Resistance to Environmental Factors:

One crucial aspect in power line installations is the ability of the cables to withstand environmental factors. OPGW cables, with their metallic sheath, offer high resistance to lightning strikes and electrical surges. The metal provides a low impedance path for fault currents, protecting the power system. ADSS cables, being non-metallic, are more vulnerable to lightning strikes. However, advancements in materials and design have improved their resistance to electrical interference, making them a viable option in many scenarios.

In conclusion, understanding the differences between OPGW and ADSS cables is essential for effectively choosing the right option for overhead power line installations. OPGW cables, with their stronger mechanical strength, excellent grounding capabilities, and high resistance to electrical surges, are suitable for longer spans and critical infrastructure. On the other hand, ADSS cables offer advantages such as lighter weight, flexibility, and lower installation costs, making them ideal for shorter spans and locations without specific grounding requirements. By considering the specific needs of the project and the environmental factors at play, the appropriate choice between OPGW and ADSS cables can be made to ensure optimal performance and reliability of power transmission systems.

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