Optical Fiber Composite Overhead Ground Wire (OPGW - Central Tube)

Optical Fiber Composite Overhead Ground Wire (OPGW) is an overhead ground wire containing optical fibers, offering multiple functions such as overhead grounding and optical communication. It is mainly used in communication lines of 110kV, 220kV, 500kV, 750kV, and newly built overhead high-voltage transmission systems. It can also be used to replace existing ground wires in old overhead high-voltage transmission systems, adding optical communication lines, conducting short-circuit current, and providing lightning protection. Special structures can be customized per customer requirements.

Product Features

Stainless steel tube protects the fiber with high tensile strength
Small cable diameter and light weight, with low additional load on towers
The optical unit provides appropriate primary fiber excess length
Slightly lower resistance to tension, torsion, and lateral pressure

Structural Parameters

Fiber: G652D/G655 and other types;
Fiber count range: 2-48 fibers
Protection tube: stainless steel tube;
Diameter: 1.5-6 mm
Stranded single wires: aluminum-clad steel / aluminum alloy / aluminum rod;
Diameter: 1.5-6 mm
Max. outer diameter: 18 mm;
Max. cross-section: 200 mm²

Mechanical Performance

Standard: DL/T 832-2016
Max. tensile strength (RTS): 280 kN;
Max. crush load: 2200 N/100 mm
Max. short-circuit current capacity: 100 kA²·s (40℃~200℃)
Min. bending radius: dynamic 20D;
static 15D (D is the OPGW cable diameter)

Environmental Performance

Installation temperature range: -10℃ to +50℃
Operating and storage temperature range: -40℃ to +65℃

Fiber Characteristics

Fiber Type	Fiber Attenuation (dB/km) @850 nm	Fiber Attenuation (dB/km) @1300 nm	Fiber Attenuation (dB/km) @1310 nm	Fiber Attenuation (dB/km) @1550 nm	Bandwidth (MHz·km) @850 nm	Bandwidth (MHz·km) @1300 nm	Polarization Mode Dispersion (ps/km), single fiber	Polarization Mode Dispersion (ps/km), link value (M=20, Q=0.01%)
G652D	—	—	≤0.35	≤0.21	—	—	≤0.20	≤0.10
G655	—	—	—	≤0.22	—	—	≤0.20	≤0.10
50/125μm	≤3.0	≤1.0	—	—	≥600	≥1200	—	—
62.5/125μm	≤3.5	≤1.0	—	—	≥200	≥600	—	—

Specific Models and Technical Parameters

Model	Cable Structure	Max. Fiber Count (cores)	Aluminum-Clad Steel Cross-Section (mm²)	Outer Diameter (mm)	Mass per Unit Length (kg/km)	Rated Breaking Load (kN)	DC Resistance at 20℃ (Ω/km)	Allowable Short-Circuit Current Capacity (40-200℃ kA²·s)
OPGW-24B1.3-40-[51;9]	6/3.0/20AS, optical unit 1/3.0	24	≈40	9.0	≤304	≥51	≤2.10	≥9
OPGW-24B1.3-50-[58;11.5]	6/3.2/20AS, optical unit 1/3.2	24	≈50	9.6	≤345	≥58	≤1.82	≥11.5
OPGW-48B1.3-70-[77;24]	6/3.8/20AS, optical unit 1/3.8	48	≈70	11.4	≤475	≥77	≤1.30	≥24
OPGW-48B1.3-70-[42;38]	6/3.8/40AS, optical unit 1/3.8	48	≈70	11.4	≤340	≥42	≤0.70	≥38

Note: Other fiber counts, fiber types, and stranding types are all customizable.

Mechanical and Environmental Performance Test Standards

Test Item	Test Method	Acceptance Criteria
Tensile	GB/T 7424.2-E1	Load: varies with cable structure; sample length: no less than 10 m, link no less than 100 m; duration: 1 min; 40% RTS: no significant fiber strain (≤0.01%) and no significant additional attenuation (≤0.03 dB); 60% RTS: fiber strain ≤0.25%, additional attenuation ≤0.05 dB (after load removal, no significant residual additional attenuation, ≤0.03 dB)
Crush	GB/T 7424.2-E3	Load: per the table above, tested at 3 points; duration: 10 min; After the test, the additional attenuation of the single-mode fiber at 1550 nm shall not exceed 0.05 dB per fiber, and the OPGW shall show no mechanical damage
Water Penetration	GB/T 7424.2-F5	Duration: 1 hour; sample length: 0.5 m; water head: 1 m; No water penetration
Temperature Cycling	GB/T 7424.2-F1	Sample length: no less than 500 m; temperature range: -40℃ to +70℃; cycles: 2; soak time: no less than 12 h; After the test, the additional attenuation of the single-mode fiber at 1550 nm shall not exceed 0.1 dB

Packaging and Delivery Requirements

Packaging: standard drums
Delivery length: 2/3 km, also customizable per customer requirements

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