OPGW
OPGW Optical Ground Wire Cable for Power Transmission Networks
OPGW, or Optical Ground Wire, is a specialized fiber optic cable designed for overhead power transmission systems. Unlike conventional aerial fiber cables, OPGW performs two functions within one engineered cable: it provides a grounding and lightning-shielding function for the transmission line while carrying optical fibers for high-capacity communication.
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Specifications of OPGW Cable
|
Brand Name |
Guangdong Shengtang |
Model Number |
OPGW |
|
Type |
Fiber Optic Cable |
Place of Origin |
Guangdong, China |
|
Number of Conductors |
≥ 10 |
Struture |
Unitube,Armored,loose tube |
|
Installation |
ALL Self supporting Aerial |
Fiber core |
12 core 24 core 48core 64 core |
|
Testing standard |
IEC |
Brand Name |
OEM |
|
Product name |
Optic Cable |
Outer sheath |
PE/AT |
|
Port |
GUANGZHOU |
|
|
Why OPGW Is Different from Conventional Fiber Cable
The main value of OPGW is not simply optical transmission.It combines two infrastructure functions:
Overhead Ground Wire
The metallic structure performs the role of an overhead shield/ground wire on the transmission line and provides a path associated with lightning and fault-current requirements.
Fiber Communication
Optical fibers integrated inside the cable provide a high-capacity communication channel for utility networks.
One Cable, Two Functions
By integrating optical communication into the overhead ground-wire position, OPGW can eliminate the need for a separate optical cable route on suitable transmission-line projects.
OPGW Structure: What Is Inside the Cable?
An OPGW cable integrates optical fibers with metallic conductors designed to provide both communication and grounding functions.
Optical Fiber Unit:Single-mode optical fibers are housed within a protected tube or optical unit.
Stainless Steel Tube:A stainless steel tube can protect the optical fibers from mechanical and environmental stress while maintaining a compact optical unit.
Central / Internal Strength Components:Metallic elements contribute to the mechanical strength and electrical performance required by the transmission-line application.
Aluminum-Clad Steel Wires:Aluminum-clad steel wires can provide a combination of mechanical strength, electrical conductivity and corrosion resistance.
Aluminum Alloy / Aluminum Wires:Depending on the design, conductive metallic strands can be incorporated to meet the required electrical and mechanical characteristics.
Outer Metallic Layer:The final stranded metallic structure is engineered to satisfy the required combination of tensile strength, electrical conductivity and weight.
OPGW for Power Grid Communication
OPGW is primarily selected when the fiber network needs to follow the transmission infrastructure.Typical applications include:
Power Transmission Lines
OPGW can provide optical communication along high-voltage and extra-high-voltage transmission corridors while functioning as the overhead ground wire.
Substation Communication
Fiber cores can support communication between substations, control centers and other grid infrastructure.
SCADA & Remote Monitoring
Dedicated optical communication can be used for supervisory control, monitoring and operational data transmission.
Protection & Control
Utility communication networks may use OPGW for protection, control and other mission-critical communication functions, subject to the system design.
Smart Grid Infrastructure
The large fiber capacity of OPGW can support communication requirements associated with increasingly connected power-grid infrastructure.
Transmission Line Upgrades
OPGW can also be considered when an existing overhead ground-wire system is being upgraded to add optical communication capability. However, the replacement method, outage requirements and tower engineering must be evaluated before deployment.
Fiber Capacity for Utility Networks
The required fiber count depends on how the utility network will use the optical cores.
Lower Fiber Count
Suitable for projects requiring basic communication capacity or limited utility services.
Medium Fiber Count
Suitable for transmission communication, substation connectivity and multiple network services.
Higher Fiber Count
Can provide additional capacity for large utility communication networks, future expansion or dark-fiber allocation.
Key Differences Between OPGW and ADSS
|
Feature |
OPGW Cable |
ADSS Cable |
|
Construction |
Includes metal strands for strength |
Fully dielectric, contains no metal component |
|
Electromagnetic Interference (EMI) |
Conductive, sensitive to EMI, requires proper grounding |
Resistant to EMI, safe to install ear high voltage lines |
|
Purpose |
Dual-purpose: carries data and functions as a grounding/lighting protection wire |
Dedicated to fibre-optic data transmission |
|
Mechanical Strength |
Strong due to metal reinforcement, heavier in weight |
Lightweight and self-supporting |
|
Installation Position |
Positioned at the top of transmission towers as the grounding wire |
Mounted near power lines on supporting structures |
|
Installation Difficulty |
More complex, it requires careful grounding and structural planning |
Relatively simple, minimal support structure needed |
|
Durability & Environmental Resistance |
Metal parts require corrosion protection, but overall robust |
Resistant to UV, extreme temperatures and corrosion |
|
Common Uses |
High-voltage transmission, lightning protection, smart-grid communication |
Data communication along power lines, railways, and highways |
|
Safety |
Conductive, requires strict safety measures during installation and maintenance |
Non-conductive, lower risk of electric hazards |
|
Cost |
Higher cost due to materials and dual functionality |
Lower materials and installation costs |
|
Maintenance & Lifespan |
Needs periodic inspection for corrosion and upkeep |
Long-lasting with minimal maintenance |
|
Future Developments |
Smart-grid integration and hybrid cables like OPPC, combining optical and electrical conductors |
Lighter, more durable materials |
OPGW Installation Considerations
OPGW installation is different from ordinary aerial fiber installation because the cable becomes part of the electrical infrastructure.
Stringing Equipment:Suitable stringing equipment and installation procedures should be used to prevent excessive mechanical stress.
Tension Control:Installation tension must remain within the cable's specified limits.
Tower Hardware:Appropriate suspension and tension fittings must be selected for the specific OPGW diameter and mechanical characteristics.
Sag Control:Sag and tension should be controlled according to the engineering design.
Grounding & Bonding:Because OPGW is metallic and forms part of the grounding system, grounding and bonding arrangements must follow the project design and applicable electrical standards.
Fiber Handling:Optical fibers remain sensitive to excessive bending and tensile stress even though they are protected within the metallic cable structure.
OPGW Manufacturing Process
Unlike conventional fiber optic cable production, OPGW manufacturing must coordinate optical protection with metallic stranding and electrical/mechanical performance.
Optical Fiber Preparation
Selected optical fibers are inspected according to the confirmed specification.
Optical Unit Assembly
Fibers are placed into the specified stainless-steel or other optical protection tube.
Tube Protection & Filling
The optical unit is processed to provide the required protection against mechanical and environmental stresses.
Metallic Wire Preparation
Aluminum-clad steel, aluminum alloy or other specified metallic wires are prepared according to the cable design.
Optical Unit Integration
The optical unit is positioned within the metallic cable structure.
Stranding
Metallic wires are stranded around the optical unit according to the approved OPGW construction.
Dimensional & Surface Inspection
The cable geometry, strand arrangement and surface condition are checked.
Optical, Mechanical & Electrical Testing
Finished OPGW undergoes the agreed inspection and testing program.
Drum Winding
Qualified cable is wound onto suitable drums for transportation and installation.
OPGW Testing & Quality Control
For OPGW, quality assurance needs to cover optical, mechanical and electrical performance.
Optical Testing:Verify fiber attenuation and other relevant optical characteristics against the specified fiber standard.
Fiber Count & Identification:Confirm the fiber quantity, sequence and identification.
Dimensional Inspection:Check cable diameter, metallic strand arrangement and other dimensional parameters.
Tensile Testing:Verify mechanical strength against the specified rated tensile requirements.
DC Resistance:Evaluate the electrical resistance of the metallic cable construction according to the applicable specification.
Short-Circuit Performance:Where required, the cable design should be evaluated against the specified short-circuit current and duration.
Bending Testing:Verify that the cable maintains the required performance after bending according to the applicable test method.
Temperature Testing:Evaluate performance under the specified temperature conditions where required.
Corrosion / Environmental Evaluation:For projects with demanding environmental conditions, additional testing or material verification can be specified.
Proper Storage of OPGW Cable
|
Category |
Requirement |
Purpose |
|
Storage Environment |
Store optical fiber cable drums indoors before use |
Protects cables from moisture, dust, and UV exposure |
|
Drum Position |
Place the cable drum horizontally (sideways) |
Prevents internal stress and maintains cable performance |
|
Placement Warning |
Do not place the drum on its ends (upright position) |
Avoids cable deformation and potential signal loss |
Company strength
Guangdong Shengtang is a national high-tech enterprise specializing in optical fiber cables, wires, devices, and access equipment, with annual sales of ~10 million core kilometers. Products serve national backbone networks and are exported to the U.S., Japan, Korea, Southeast Asia, Europe, and the Middle East for telecom, railway, power, broadcasting, aerospace, and defense sectors. Known for quality raw materials, process control, and after-sales service, the company continuously innovates with patented products.
Packaging & Shipping
OPGW is supplied on cable drums suitable for long-distance transportation and controlled installation.
Cable Drum:Cable length and drum dimensions can be coordinated according to project requirements.
Shipping Options:
- Sea Freight:Recommended for large project quantities and international bulk shipments.
- Rail Freight:Available for selected destinations and suitable project schedules.
- Air Freight:Suitable for samples, urgent technical requirements or smaller-volume shipments.
Industry Recognition
Our products are trusted by leading industry players across China, including China Telecom, China Mobile, China Unicom, China Railway Construction Corporation (CRCC), China Eastern Airlines, and PetroChina. These long-term partnerships demonstrate our reliability and competitiveness in serving critical infrastructure and communication sectors.
Certifications
Guangdong Shengtang Optical Fiber Cable & Communication Equipment Co., Ltd. operates under a strict quality management system and has obtained internationally recognized certification, including the SGS ISO 22000:2005, reflecting our commitment to consistent product quality and process control.
FAQ
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