CONSTRUCTION & ENERGY

Protective wire + fiber backbone

Objective:

Measurement-verified commissioning

The biggest advantage of establishing communication over the ENH (Electricity Transmission Line) is the use of the existing transmission corridor. Opening a separate route for a new communication line can increase the burden of permits and expropriation. With OPGW (Electricity Transmission Line), fiber runs over the already used energy corridor; thus, both field logistics are simplified and the long-distance communication backbone can be established in a more planned manner. In addition, since fiber optics is a transmission medium unaffected by electromagnetic interference, it offers a reliable and high-performance communication solution in energy transmission environments.

When is OPGW preferred, and how does it differ from traditional fiber optic cable?

OPGW is “part of the line” — while ADSS travels in a separate route. This difference determines the requirements for lightning protection, mechanical strength, and compliance with ENH standards.

OPGW is mostly used in high-voltage and some medium-voltage power transmission lines, replacing the protective wire located at the highest point of the line. Classical ADSS (All-Dielectric Self-Supporting) solutions, on the other hand, are entirely dielectric and are carried on poles with various connection arrangements. The fundamental difference of OPGW is that it is "part of the power line". This provides advantages, especially in terms of lightning protection and mechanical strength, but requires high compliance with power line standards during installation and operation.

To ensure the right choice is made, the following parameters are evaluated together during the project phase:

• Track geometry and supporting structure
  Track stress level, mast/tower structure and spans.

• Mechanical load and sagging
  Wind, ice load, tensile force and sagging configuration.

• Fiber capacity and armor structure
  Number of fibers (core), armor/environmental resistance and protection configuration.

Project and Design Process
OPGW/fiber integration is not simply a matter of "pulling and finishing the cable"; it requires end-to-end design. First, the line route and pole/tower configuration are examined; the line spans and tower types are made compatible with the mechanical properties of the OPGW. Then, on the fiber planning side, ring or point-to-point topology, splice points, OPGW-OF cable crossings, and termination (ODF/panel) architecture are determined. Incorrectly planned splice box locations or unnecessary splices at this stage both increase attenuation and increase future maintenance risks.

The project phase typically produces the following outputs: route plan, tower-based mounting details, fiber splice plan, ODF-patch layout, labeling standard, and measurement plan. In a good project, the field team clearly sees not only "where it will pass" but also "where splices will be made and how the fibers will be managed."

Field Application: OPGW Stringing and Fiber Integration
Field application is carried out in accordance with the ENH discipline. OPGW stringing is a stringing operation similar to classic conductor stringing; however, because it carries fiber, the bending radius, tension control, and risk of damage must be managed much more precisely during stringing. The selection of stringing equipment, reels, and terminals is made according to the OPGW manufacturer's specifications. Safety measures are increased at the crossing points of the line (roads, streams, settlements), and procedures are implemented to prevent damage to the fiber throughout the stringing process.

The following steps are generally emphasized in the application:

• Filming plan and permits
  Security corridor, work permits and operational planning.

• Hardware and vibration control
  Suspension and release assemblies, vibration dampers and coupling equipment.

• Joint termination and labeling
  Joint closure assembly, fiber splices, and numbering scheme.

Splice boxes and terminations are the heart of the "communication" part of the system. The quality of the fiber splices directly determines the total attenuation value of the fiber. Therefore, proper fiber management at splice points, the use of the correct splice cassette, and on-site dirt and moisture control are crucial. Work done without establishing ODF panels, patch layout, and fiber numbering standards on the termination side will cause significant confusion and increased downtime in the operation.

Measurement, Testing and Commissioning

Commissioning = verification by measurement

OTDR+ power meter reports clarify additional losses, reflection points, and end-to-end losses.

In OPGW/fiber integration, commissioning means verification through measurement. After the field is completed, OTDR measurements are used to check attenuation, reflection points, additional losses, and distances along the line. End-to-end loss values ​​are verified and reported using power meter measurements. If the system will be used for SCADA, teleprotection, or enterprise data traffic, basic link tests and alarm scenarios are run on active devices (switches, routers, SDH/OTN, etc.).

At this stage, what determines the quality of delivery is not just whether the "link is up," but the consistency of the measurement reports and the exact alignment with the field labeling and fiber plan. 2G Construction & Energy aims for a ready-to-operate delivery by completing OTDR reports, the additional plan, and as-built documentation together during the fiber commissioning process.

Applications of Communication Over the Power Supply Network (PPGW)
Fiber backbone established over the PPGW has a very wide range of applications for energy companies and large infrastructure operators. It provides a robust infrastructure for remote monitoring and management of the network, secure transmission of protection signals, and intra-company data traffic. The most common application purposes are communication between substations, SCADA communication, teleprotection (protection signals), and corporate network backbone.

CONCLUSION
OPGW/fiber integration adds communication capabilities to overhead power line investments, making the network more traceable, manageable, and secure. However, the real benefit is achieved through the right project, the right installation, and a commissioning process verified with measurements. When installing your OPGW/fiber infrastructure over overhead power lines, you need an end-to-end professional approach, from survey to site work, from additional planning to OTDR testing. 2G Construction & Energy is with you in the installation of communication infrastructure over overhead power lines with project-implementation-commissioning integrity.