Temperature dependent dynamic loadability control for transmission lines

Introducing Dynamic Thermal Line Rating (DTLR) algorithms into existing power systems protection and control allows for better utilization of already existing overhead transmission lines. DTLR application creates a possibility of increasing currents flowing through line conductors (over their normal values) and following on from this also increasing the power flow. From the power system protection viewpoint - using DTLR creates a new way of protection devices operation and coordination. The paper presents results of investigations carried over the possibility of current and power flow increase for 20kV AFL 6 240 and 110kV AFL 8 525 distribution/transmission lines. Obtained data was collated in tables and presented in figures showing where and how additional profits can be obtained without incurring additional costs coming from line modernization.