Optical Fiber Composite Overhead Ground Wire (OPGW – Central Tube Type)

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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 strike protection. Special structures can be customized according to customer requirements.

• Stainless steel tube protects the optical fibers, with high tensile strength

• Small cable diameter and light weight, resulting in low additional load on towers

• The optical unit forms a suitable primary fiber excess length

• Somewhat inferior tensile, torsional, and lateral compression performance

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Technical specifications:

Fiber Type	Fiber Attenuation				Bandwidth		Polarization Mode Dispersion
Fiber Type	@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.	2~48 Fibers
	Protection Tube	Stainless Steel Tube	1.5~6mm
	Stranded Wires	Aluminum-Clad Steel / Aluminum Alloy / Aluminum Rod	1.5~6mm
	Maximum Outer Diameter		18mm
	Maximum Cross-Sectional Area		200mm²
Mechanical Performance	Complies with Standard DL/T 832-2016
	Maximum Tensile Strength (RTS) (kN)		280
	Maximum Crush Resistance (N/100mm)		2200
	Maximum Short-Circuit Current Capacity (40℃~200℃) (kA²s)		100
	Minimum Bending Radius (Dynamic)		20D
	Minimum Bending Radius (Static)		15D
Environmental Performance	Installation Temperature Range (℃)		-10~+50
Environmental Performance	Operating and Storage Temperature Range (℃)		-40~+65

Specific Models and Technical Parameters:

No.	Technical Specifications
No.	Product Model	Optical Cable Structure	Maximum Fiber Count (Fibers)	Aluminum-Clad Steel Cross-Sectional Area (mm²)	Outer Diameter (mm)	Weight per Unit Length (kg/km)	Rated Tensile Strength (kN)	DC Resistance at 20℃ (Ω/km)	Allowable Short-Circuit Current Capacity (40~200℃ kA²·s)
1	OPGW-24B1.3-40-[51;9]	6/3.0/20AS, Optical Unit 1/3.0	24	≈40	9.0	≤304	≥51	≤2.10	≥9
2	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
3	OPGW-48B1.3-70-[77;24]	6/3.8/20AS, Optical Unit 1/3.8	48	≈70	11.4	≤475	≥77	≤1.30	≥24
4	OPGW-48B1.3-70-[42;38]	6/3.8/40AS, Optical Unit 1/3.8	48	≈70	11.4	≤340	≥42	≤0.70	≥38

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.