Our DLR Study Approach

Dynamic Line Rating (DLR) is an advanced method for determining the real-time power transfer capability of overhead transmission lines using actual meteorological conditions rather than conservative static assumptions. Because real ambient temperature, wind speed, and solar radiation rarely match the worst-case values used in Static Line Rating (SLR), transmission lines can typically operate at significantly higher capacities for most hours of the year. This makes DLR an effective, low-cost approach for increasing transfer capability, relieving congestion, improving import and export flexibility, and postponing major capital investments. It also enhances operational security during peak seasons by unlocking capacity that already exists within the network.

CCG conducts DLR studies using a comprehensive engineering and analytical methodology grounded in the IEEE 738 and CIGRÉ TB 601 standards. Each study begins with the consolidation of historical SCADA load data, multi-year meteorological records, and detailed line design parameters. These datasets are synchronized and processed to create accurate time-series inputs for thermal and electrical modeling of the conductor. Using a span-level heat balance model, we simulate conductor temperature under real weather conditions and determine the corresponding dynamic ampacity profile, which shows how much additional current the line could have safely carried. Special attention is given to wind speed and direction, as most cooling occurs at low wind speeds and saturates beyond approximately 2 m/s; therefore, a probabilistic assessment of wind conditions along the line route plays a central role in identifying realistic DLR potential.

The results of the study provide a quantified comparison between static and dynamic ratings, expressed both as a percentage increase and as additional megawatts of transfer capability. These findings are complemented by an evaluation of the economic benefits that DLR can deliver, including the value of additional energy transfer, reduced congestion or curtailment, and the postponement of major grid reinforcement projects. The final report includes a prioritized view of which lines offer the highest technical and economic benefit, supported by clear recommendations for implementation and a roadmap covering technical solutions, pilot deployment, integration into system operations, and data requirements. Through this approach, CCG offers transmission operators a precise, evidence-based foundation for introducing DLR into their grid planning and operational practice.

Deliverables

A completed DLR study results in a comprehensive report that includes:

• Ranked list of lines with highest DLR potential
• Technical modeling results and ampacity datasets
• Economic benefit analysis
• Recommended DLR technology and vendor options
• Step-by-step deployment roadmap

Why CCG

CCG combines engineering expertise, analytical capability, and international experience with DLR programs. Our approach is tailored for utilities operating in difficult climatic environments and long-distance transmission networks.

Our studies are designed for transmission operators who seek:

• A rigorous, evidence-based evaluation
• Reliable quantification of benefits before investment
• Practical recommendations suitable for real operational conditions