Optical Fiber Composite Overhead Ground Wire (OPGW) is an overhead ground wire containing optical fibers, with multiple functions such as overhead grounding and optical communication. It is mainly used for communication lines in 110 kV, 220 kV, 500 kV, 750 kV and newly built overhead high-voltage power transmission systems. It can also be used to replace existing ground wires in old overhead high-voltage transmission systems, add optical communication lines, conduct short-circuit currents and provide lightning protection. Special structures can be customized according to customer requirements.
• Large cable diameter allows designs with a high fiber count
• Stable structure and high reliability
• High tensile strength and short-circuit current capacity, achieving an optimal balance between mechanical and electrical performance
• Optimal stranding design to obtain secondary fiber excess length
• The number of stranding layers can be designed as two or three
• The wires can be aluminum-clad steel wires and/or a combination of aluminum alloy wires and aluminum wires
Technical specifications:
| Fiber Type | Fiber Attenuation | Bandwidth | Polarization Mode Dispersion | |||||
|---|---|---|---|---|---|---|---|---|
| @850nm | @1300nm | @1310nm | @1550nm | @850nm | @1300nm | Individual Fiber | Link Value (M=20, Q=0.01%) | |
| G652D | — | — | ≤0.35dB/km | ≤0.21dB/km | — | — | ≤0.20ps/√km | ≤0.1ps/√km |
| G655 | — | — | — | ≤0.22dB/km | — | — | ≤0.20ps/√km | ≤0.1ps/√km |
| 50/125μm | ≤3.0dB/km | ≤1.0dB/km | — | — | ≥600MHz·km | ≥1200MHz·km | — | — |
| 62.5/125μm | ≤3.5dB/km | ≤1.0dB/km | — | — | ≥200MHz·km | ≥600MHz·km | — | — |
Structural and Performance Parameters:
| Type | Material | Value | |
|---|---|---|---|
| Structure | Optical Fiber | G652D/G655, etc. | 2~144 Fibers |
| Protection Tube | Stainless Steel Tube | 1.5~6mm | |
| Stranded Wires | Aluminum-Clad Steel / Aluminum Alloy / Aluminum Rod | 1.5~6mm | |
| Maximum Outer Diameter | 30mm | ||
| Maximum Cross-Sectional Area | 500mm² | ||
| Mechanical Performance | Complies with Standard DL/T 832-2016 | ||
| Maximum Tensile Strength (RTS) (kN) | 700 | ||
| Maximum Crush Resistance (N/100mm) | 3000 | ||
| Maximum Short-Circuit Current Capacity (40℃~200℃) (kA²s) | 2000 | ||
| Minimum Bending Radius (Dynamic) | 20D | ||
| Minimum Bending Radius (Static) | 15D | ||
| Environmental Performance | Installation Temperature Range (℃) | -10~+50 | |
| Operating and Storage Temperature Range (℃) | -40~+65 | ||
Mechanical and Environmental Performance Testing:
| Item | Test Method | Acceptance Criteria |
|---|---|---|
| Tensile Test |
GB/T 7424.2-E1 Load: According to the optical cable structure Sample Length: Not less than 10m; Link Length: Not less than 100m Holding Time: 1min |
At 40% RTS, no obvious strain in the optical fiber (0.01%), and no obvious additional attenuation (0.03dB). At 60% RTS, fiber strain ≤0.25%, and additional attenuation ≤0.05dB. After unloading, no obvious residual additional attenuation (0.03dB). |
| Crush Test |
GB/T 7424.2-E3 Load: According to the above table Test at 3 points Holding Time: 10min |
After the test, the additional attenuation of a single fiber at 1550nm shall not exceed 0.05dB/fiber, and the OPGW shall have no mechanical damage. |
| Water Penetration Test |
GB/T 7424.2-F5 Duration: 1 hour Sample Length: 0.5m Water Height: 1m |
No water penetration. |
| Temperature Cycling Test |
GB/T 7424.2-F1 Sample Length: Not less than 500m Temperature Range: -40℃~+70℃ Number of Cycles: 2 Holding Time: Not less than 12h |
After the test, the additional attenuation of a single fiber at 1550nm shall not exceed 0.1dB. |
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