DocumentCode :
1084446
Title :
Assessment of conductor thermal models for grid studies
Author :
Santos, Jose Ronaldo ; Exposito, A.G. ; Sanchez, F.P.
Author_Institution :
Dept. de Ingeniera Electr.a, Escuela Superior de Ingenieros, Sevilla
Volume :
1
Issue :
1
fYear :
2007
fDate :
1/1/2007 12:00:00 AM
Firstpage :
155
Lastpage :
161
Abstract :
Existing EMS applications resort to static network models built upon constant resistances whose values are specified beforehand. However, the steady-state thermal balance of overhead conductors requires that ohmic losses be dissipated by convection and radiation heat, leading to conductor resistances being a function both of environmental factors and transmitted current. Each term of the equation involved in the thermal balance of overhead conductors is analysed allowing the influence of conductor current on conductor temperature to be separated from that corresponding to environmental factors. As a result, three approximate thermal models are elaborated, which are compared on the Spanish transmission system. Test cases are included showing that the influence of the selected model on transmission losses may be significant enough, particularly when the transmission system spans areas with diverse loading levels and weather conditions.
Keywords :
electric resistance; environmental factors; load flow; overhead line conductors; power grids; thermal analysis; transmission network calculations; EMS applications; Spanish transmission system; conductor current; conductor resistances; conductor temperature; convection; diverse loading levels; diverse weather conditions; environmental factors; heat radiation; load-flow analysis; ohmic losses; overhead conductors; power grid studies; steady-state thermal balance; thermal models; transmission losses;
fLanguage :
English
Journal_Title :
Generation, Transmission & Distribution, IET
Publisher :
iet
ISSN :
1751-8687
Type :
jour
DOI :
10.1049/iet-gtd:20050472
Filename :
4082381
Link To Document :
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