Title :
Modeling of Gas-Insulated Lines buried in single and in two-layer earth
Author :
Tsiamitros, D.A. ; Papadopoulos, T.A. ; Papagiannis, G.K.
Author_Institution :
Dept. of Electr. & Comput. Eng., Aristotle Univ. of Thessaloniki, Thessaloniki, Greece
Abstract :
The accurate modeling of 3-phase Gas-Insulated Lines (GIL) buried directly into the earth is the objective of this paper. The frequency-dependent terms that correspond to the influence of the nonhomogeneous earth, of the SF6/N2 mixture insulator and of the skin effect are integrated in the per-unit length impedance and admittance matrices of the system. After a proper modal transformation, the modal propagation characteristics of the system are derived. Several parametric investigations are carried out for varying soil parameters and for different two-layer earth structures in order to evaluate the influence of each of these characteristics on the propagation properties of the GIL configuration.
Keywords :
gas insulated transmission lines; skin effect; 3-phase gas-insulated lines; GIL; admittance matrices; length impedance; mixture insulator; modal transformation; nonhomogeneous earth; propagation properties; skin effect; two-layer earth structures; Admittance; Cables; Conductors; Earth; Electromagnetic propagation; Gas insulated transmission lines; Impedance; Power system modeling; Protection; Soil; Earth return admittance; Gas-Insulated Lines; earth return impedance; electromagnetic transients; nonhomogeneous earth;
Conference_Titel :
Universities Power Engineering Conference (UPEC), 2009 Proceedings of the 44th International
Conference_Location :
Glasgow
Print_ISBN :
978-1-4244-6823-2
