OTLM (Overhead Transmission Line Monitoring) is a system solution for monitoring and rating your existing and new overhead lines (OHL) based on real-time monitoring of conductor temperature, sag, load, and weather conditions. OTLM system supports more efficient operation of OHL enhancing safety and flexibility of grid operations. Dynamic operation supports safe utilization of maximum capacity of OHL. OTLM system aids in flexible and profitable operation of assets. OTLM system with weather station and rating software supports dynamic rating of OHL.
The key elements for OHL dynamic thermal rating are the conductor composition and construction, its temperature and weather conditions along the OHL line. While considering the safety margins it is obvious that the key information is the conductor temperature.
Efficiency: adding ampacity to your OHL
Safety: alerting before critical loads and sag
Flexibility: profitable utilisation of OHL and reaction on transmission conditions
Transparency: continuous data analyses of OHL
The ampacity – current-carrying capacity of OHL is typically defined by average seasonal temperatures, with limited cooling contribution from wind. This conservative approach might prove to be a missed opportunity. OTLM system enables power utilities and system operators to increase ampacity of the existing OHL without increasing the risk of equipment or system failure due to higher loading.
Dynamic versus static rating
Rated current (static rating) is defined on the basis of conservative ambient conditions, conductor composition and construction with high safety margins. Dynamic rating is a steady load that produces maximum operating temperature computed on instantaneous basis for actual loading, conductor temperature and weather conditions.