Abstract
Traditionally, Static Thermal Rating (STR) calculates current carrying capacity based on “Worst case weather conditions”, which is used by most of the utilities around the world including Sri Lanka. Assumptions made in the STR calculations may reduce the actual line capacity whenever real weather conditions are less stressful. However, the smart-grid technology based Real Time dynamic Thermal Rating (RTTR) allows to utilize the overhead line conductors by increasing the current carrying capacity of the line based on real time weather data. The identification of critical span to ensure the minimum electrical clearance is the major consideration to ensure the safety of the people and equipment when applying RTTR method. This paper presents a method to introduce real time thermal rating to overhead transmission lines in Sri Lanka. Current rating of lines is calculated using real time weather data. In here, the selected line sections have been analysed using PLSCADD software with RTTR design. This novel methodology can be used by system operators to analyse weather based current ratings for the transmission network in future.
Highlights
Demand for electricity is increasing rapidly with technological growth and improvement in the quality of life
Current carrying capacity of those lines have to be increased with conventional methods like using higher rating conductors or higher ampacity lower sag conductors, or by reconstructing the line using the same Right Of Way (ROW)
As per the outcomes of this study, the following conclusions were made regarding the usage of Real Time dynamic Thermal Rating (RTTR) method in the transmission network of Sri Lanka
Summary
Demand for electricity is increasing rapidly with technological growth and improvement in the quality of life. An excessive conductor temperature may give rise to an excessive elongation of the conductor with consequent dangerous reduction of the electrical clearances to ground All these effects caused by an excessive current may put public safety at risk. To overcome this issue, current carrying capacity of those lines have to be increased with conventional methods like using higher rating conductors or higher ampacity lower sag conductors, or by reconstructing the line using the same Right Of Way (ROW). Current carrying capacity of those lines have to be increased with conventional methods like using higher rating conductors or higher ampacity lower sag conductors, or by reconstructing the line using the same Right Of Way (ROW) These are not possible for some lines because of line interruptions will be a big issue in urban areas where most of the industrial loads are carried by these lines
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