Technical Specifications for Optical Fiber Cable
An optical ground wire (also known as an OPGW or, in the IEEE standard, an optical fiber composite overhead ground wire) is a type of cable that is used in overhead power lines. Such cable combines the functions of grounding and communications. It has central stainless steel tube structure and layer stranding structure. An OPGW cable contains a tubular structure with one or more optical fibers in it, surrounded by single or double layers of aluminum clad steel wires(ACS) or mixed ACS wires and aluminum alloy wires. The OPGW cable is run between the tops of high-voltage electricity pylons. The conductive part of the cable serves to bond adjacent towers to earth ground, and shields the high-voltage conductors from lightning strikes. The optical fibers within the cable can be used for high-speed transmission of data, either for the electrical utility's own purposes of protection and control of the transmission line, for the utility's own voice and data communication, or may be leased or sold to third parties to serve as a high-speed fiber interconnection between cities. To construct OPGW must cut power, resulting in greater loss, thus OPGW must be used in constructing high pressure line over 110KV.
1. Replace existing aerial ground wires, upgrading communication lines of power systems.
2. Synchronous plan and design with ground wire when new aerial power lines are to be constructed
3. Provide stainless tube fiber unit with optimal protection
4. Conduct large fault short-circuit current and providing lightning protection
5. Suitable for application in hih fiber count and super high voltage power lines
6. Match with favorable tension-sag of the diffluent grond wire.
Application
Optical fiber composite ground wire [OPGW] is suitable for installation on new power lines with double function of ground wire and communication. Especially for installation on normal voitage and extra high voltage power lines. OPGW can replace conventional ground wire of old power line with increasing fiber communication function. They conduct short circuit current and provide lightning resistance.
Optical Fiber Characteristics
The optical, geometrical, mechanical and environment characteristics of the ITU-T G.652.D optical fiber shall be accordance with below table:
| Characteristics | Specified Values | Units |
| Optical Characteristics |
| Mode field diameter | at 1310nm | 9.1±0.5 | µm |
| at 1550nm | 10.3 ± 0.7 | mm |
| Attenuation coefficient | at 1310nm | ≤0.36 | dB/km |
| at 1550nm | ≤0.23 | dB/km |
| Attenuation non-uniformity | ≤0.05 | dB |
| Zero dispersion wavelength ( λ0) | 1300 ～1324 | nm |
| Max zero dispersion slope (S0max) | ≤0.092 | ps/(nm2·km) |
| Polarization mode dispersion coefficient(PMDQ) | ≤0.2 |  |
| Cut-off wavelength (λcc) | ≤1260 | nm |
| Dispersion coefficient | 1288～1339nm | ≤3.5 | ps/(nm·km) |
| 1550nm | ≤18 | ps/(nm·km) |
| Effective group index of refraction (Neff) | at 1310nm | 1.466 | － |
| at 1550nm | 1.467 | － |
| Geometric characteristic |
| Cladding diameter | 125.0±1.0 | µm |
| Cladding non-circularity | ≤1.0 | % |
| Coating diameter | 245.0±10.0 | µm |
| Coating-cladding concentricity error | ≤12.0 | µm |
| Coating non-circularity | ≤6.0 | % |
| Core-cladding concentricity error | ≤0.8 | µm |
| Cladding / coating concentricity error | ≤12.0 | µm |
| Mechanical characteristic |
| Curling | ≥4 | m |
| Proof stress | ≥0.69 | GPa |
| Coating strip force | Average value | 1.0-5.0 | N |
| Peak value | 1.3-8.9 | N |
| Macro bending loss | Ф60mm, 100 circles, at 1550nm | ≤0.05 | dB |
| Ф32mm, 1 circles, at 1550nm | ≤0.05 | dB |
| | | | | |
Characteristics of Cable
Cable Construction and Parameter
Overhead ground wire made of aluminum-clad steel wire (AS) and stainless steel tube containing optical fiber.
3.2Cable type: OPGW-48B1.3-190[205;185.4]
3.2.1 Cross section of OPGW
| Structure | | Material | No. | Material Diameter |
| Fiber | G.652.D | 48 | |
| Center | 20%AS wire | 1 | Diameter | 4.0mm |
| Layer 1 | SUS Tube | 4 | Diameter | 4.0mm |
| 20%AS wire | 2 | Diameter | 4.0mm |
| Layer 2 | 20%AS wire | 12 | Diameter | 4.0mm |
| Items | Technical Data |
| Stranded | Core, layer 1, layer 2 |
| Stranding direction | Outer layer is right hand |
| Cable diameter (Nominal) | 20.0mm |
| Cable Weight (Approx.) | 1365kg/km |
| Supporting Cross Section | AS Wire | 188.5mm2 |
| Rated Tensile Strength (RTS) | 205kN |
| Modulus of Elasticity (E-Modulus) | 162.0kN/mm2 |
| Thermal Elongation Coefficient | 13.0×10-6/K |
| Maximum Working Stress (40%RTS ) | 82.0kN |
| Everyday Stress(EDS)(18%～25%RTS) | 36.9~51.25kN |
| DC Resistance at 20℃ | 0.442 ohm/km |
| Short time current (1.0s, 40℃～200℃) | 13.62kA |
| Short time current Capacity I2t | 185.4kA²s |
| Minimum bending radius | Installation | 30 times of cable diameter |
| Operation | 15 times of cable diameter |
| Temperature Range | Installation | -10℃~+60℃ |
| Storage & shipping | -40℃~+60℃ |
| Operation | -40℃~+80℃ |
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Fiber and Loose Tube Color Identification
The individual fiber and loose tubes shall accordance with standard TIA/EIA-598-A and the color code as below.
Steel tube 1 (No.1-12 fibers) : Single mode optical fiber (SM)
Fiber Colors
| NO. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Color | Blue | Orange | Green | Brown | Grey | White | Red | Nature | Yellow | Violet | Pink | Aqua |
Steel tube 2 (No.13-24 fibers) : Single mode optical fiber (SM)
One black tracer (50mm pitch)
| NO. | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 |
| Color | Blue | Orange | Green | Brown | Grey | White | Red | Nature | Yellow | Violet | Pink | Aqua |
Steel tube 3 (No.25-36 fibers) : Single mode optical fiber (SM)
One black tracer (100mm pitch)
| NO. | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 |
| Color | Blue | Orange | Green | Brown | Grey | White | Red | Nature | Yellow | Violet | Pink | Aqua |
Steel tube 4 (No.37-48 fibers) : Single mode optical fiber (SM)
One black tracer (150mm pitch)
| NO. | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 |
| Color | Blue | Orange | Green | Brown | Grey | White | Red | Nature | Yellow | Violet | Pink | Aqua |
Packing and Shipping
The OPGW shall be tightly and uniformly wound on a strong wood-iron reel which conforms to ANSI/AA 53-1981 or equal. The reel shall be lagged with stout wood-iron battens so as to prevent the OPGW from damage in ordinary shipping, handling, storage and stringing operations.
Drawing of Reel
According to length of cable, we choose different type reel (D,d,b,w1,w2) for loading cable.
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24 Core 48 Core OPGW Fiber Cable Cut Off Wavelength ≤1260nm Compact Structure Images
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