Stranding Stainless Steel Tube OPGW Cable

The Stranding Stainless Steel Tube OPGW (Optical Ground Wire) is a dual-purpose aerial cable that integrates a conventional overhead ground wire with optical fiber communication into a single stranded structure. Designed for high-voltage transmission lines, it shields conductors from lightning strikes while simultaneously carrying high-speed data for power grid dispatching, monitoring, and telecommunication networks.

Compared with a central-tube design, the layer-stranded structure places one or more hermetically sealed stainless steel tubes around a central aluminum-clad steel (ACS) wire, surrounded by one or more layers of ACS and aluminum alloy (AA) wires. This construction delivers a larger metal cross-section, higher rated tensile strength (RTS), and greater short-circuit current capacity — making it the preferred choice for newly built transmission lines and applications requiring large fiber counts.

What Is Stranding Stainless Steel Tube OPGW?

OPGW stands for Optical Fiber Composite Overhead Ground Wire. In a stranding (layer-stranded) type, the optical fibers are housed inside laser-welded stainless steel tubes filled with water-blocking gel. These tubes, together with aluminum-clad steel wires and aluminum alloy wires, are stranded around a central strength member to form a compact, circular cable.

Because the stainless steel tube sits within the stranded layers rather than at the exact center, each fiber unit is mechanically decoupled from the outer armor. The result is excellent protection against tensile stress, side pressure, torsion, and temperature variation — ensuring stable optical transmission even under harsh overhead conditions such as strong wind, ice loading, and lightning.

Structure & Design

• Central strength member: a single aluminum-clad steel (ACS) wire that bears the main mechanical load.
• Optical unit: hermetically sealed stainless steel tube(s) housing up to 24/48/96 fibers, filled with water-blocking compound to keep moisture out.
• Stranded armor layers: one or two layers of ACS wires (for tensile strength) combined with aluminum alloy wires (for conductivity and short-circuit current capacity).
• Corrosion protection: the interstices are filled with corrosion-resistant compound, and the whole cable is compact and circular for minimal wind and ice load on the tower.

Main Features

• Compact diameter & light weight — low additional load on the tower and reduced wind/ice loading.
• High tensile strength — adapts to the overhead tension of high-voltage power lines and resists wind, ice, and mechanical damage.
• Excellent corrosion resistance — the stainless steel tube structure suits long-term service in field, high-humidity, and salt-spray environments.
• Low transmission loss — ensures stable, high-speed transmission of power dispatching, monitoring, and communication data.
• Anti-electromagnetic interference — optical signal transmission remains stable and reliable in the strong EMI environment of power grids.
• Cost-efficient installation — can be erected synchronously with power lines, avoiding independent wiring and greatly cutting project cost and construction period.
• Steel tube protected within stranded layers — no secondary mechanical fatigue damage to the fiber unit.

Technical Specifications

Applications

• Replacement of existing ground wires and reconstruction of old transmission lines (e.g. GJ50/70/90 and similar low-grade lines).
• Newly built overhead high-voltage transmission lines requiring both lightning shielding and communication.
• Smart grid communication backbones — SCADA, protective relaying, substation automation, and real-time monitoring.
• Telecommunication networks built along power line rights-of-way, including dark fiber leasing.
• Renewable energy (wind farms, solar plants) grid-connection communication links.

Why Choose Our Stranded OPGW Cable?

• Custom engineering: cable structure is designed around your span length, ice/wind load, short-circuit current, and fiber count requirements.
• Higher fiber capacity: stranded design supports large fiber counts (up to 96 cores and above) without excessive cable diameter.
• Reliable performance: laser-welded stainless steel tubes provide a hermetic barrier against moisture and act as a thermal shield during short-circuit faults (up to 300°C).
• Complete solution: OPGW cable supplied with compatible fittings — dead-end, suspension assemblies, joint boxes, and vibration dampers.
• Factory-direct pricing & export experience: competitive quotation, wooden/iron-wood drums, and full export documentation.

FAQ

Q1: What is the difference between stranding type and central tube type OPGW?

A central tube OPGW places a single stainless steel tube at the exact center, offering a thinner, lighter cable ideal for retrofitting old lines. A stranding (layer-stranded) OPGW wraps one or more stainless steel tubes around a central ACS wire, allowing larger fiber counts, higher RTS, and greater short-circuit capacity — better suited for newly built high-voltage lines.

Q2: How do I choose the right OPGW specification?

Provide your voltage level, system short-circuit current (kA) and duration (s), span length, local wind/ice load, and required fiber count. We will calculate the required metal cross-section (mm²), RTS (kN), and short-circuit capacity (kA²·s) and recommend the matching OPGW model.

Q3: Can this OPGW replace an existing ground wire?

Yes. Stranded OPGW is commonly used to replace existing ground wires on old lines. However, please confirm the tower loading capacity, as OPGW may be heavier than the original steel ground wire.

Q4: What is the service life of the cable?

A high-quality stranded stainless steel tube OPGW is designed for a service life of 30–40 years, matching or exceeding that of the power conductors.

Q5: Do you provide installation accessories?

Yes. We supply a full range of OPGW fittings including dead-end assemblies, suspension clamps, joint boxes (metallic, grounded), and vibration dampers.

Contact us for a customized OPGW quotation — tell us your line parameters and fiber count, and our engineers will design the optimal structure for your project.