ADSS (All-Dielectric Self-Supporting) and OPGW (Optical Ground Wire) are two core types of overhead fiber optic cables used in power system communications. OPGW is primarily deployed on newly constructed high-voltage transmission lines—such as those rated at 500kV, 220kV, and 110kV—where it serves as an overhead ground wire while simultaneously facilitating both communication and lightning protection. ADSS, conversely, is predominantly utilized on existing lines rated at 110kV and below (though it is also occasionally used on 220kV lines); it is particularly well-suited for retrofit projects involving long spans or those requiring installation without interrupting power supply.
1. Applications of OPGW (Optical Ground Wire):
** OPGW combines the characteristics of traditional overhead ground wires with those of fiber optics. Because it serves the dual purpose of providing lightning protection for high-voltage transmission lines while acting as a medium for high-speed communication, it is frequently deployed in power systems where high communication reliability is paramount. **Applicable Transmission Lines:** Primarily newly constructed transmission systems rated at 220kV, 500kV, and 110kV. **Key Functions:** Lightning protection, shielding of conductors, data transmission, and secure signal transmission.
**Advantages:Installed at the very top of transmission towers, ensuring safe and reliable operation; however, as it is typically integrated into new line construction, the initial capital investment is generally higher.
2. Applications of ADSS (All-Dielectric Self-Supporting Cable):
** ADSS is a non-metallic fiber optic cable featuring a fully insulated structure and high tensile strength. It is suspended from existing transmission towers and requires no additional insulation coordination. **Applicable Transmission Lines:** Existing lines rated at 110kV, 220kV, and 35kV; it is particularly widely used in the retrofitting of aging lines and within dedicated power utility communication networks. **Key Functions:** Leveraging existing power transmission towers to construct information transmission networks and facilitate digital modernization. **Advantages:** Installation can be performed without requiring a power outage, thereby reducing construction costs; it offers safer operation and is immune to electromagnetic interference.
3. Application Comparison: Summary of Key Features | OPGW Cable | ADSS Cable | Installation Target | New High-Voltage Transmission Lines | Existing Transmission Lines (Retrofitting) | Voltage Level | 500kV, 220kV, 110kV | 110kV, 220kV, 35kV | Construction Method | Requires Power Outage (High Cost) | No Power Outage (Flexible Operation) | Metallic Structure | Yes (Possesses Lightning Resistance) | No (Fully Insulated; Suitable for Lightning-Prone Environments) | In summary, for newly constructed high-voltage lines, OPGW is generally the preferred choice to ensure stable and reliable communication; conversely, when adding communication capabilities to lines already in operation, ADSS is typically the first choice.
Yulia Liu
May 7th,2026
