Title :
Earth Return Impedances of Conductor Arrangements in Multilayer Soils—Part II: Numerical Results
Author :
Tsiamitros, Dimitrios A. ; Papagiannis, Grigoris K. ; Dokopoulos, Petros S.
Author_Institution :
Dept. of Electr. & Comput. Eng., Aristotle Univ. of Thessaloniki, Thessaloniki
Abstract :
The influence of earth stratification on the conductor impedances is investigated in this paper. The generalized expressions for the self and mutual impedance of conductors in the multilayer earth case, which have been derived in a companion paper, are implemented on typical overhead power transmission lines and underground single-core power cable arrangements for discrete and exponential variations of earth resistivity. The accuracy of the results over a wide frequency range is justified by a proper finite-element method formulation. The differences in the impedances due to earth stratification are presented. The influence of the earth stratification on the actual transient responses of the conductor arrangements is also investigated.
Keywords :
conductors (electric); earthing; finite element analysis; power cables; power overhead lines; soil; transient response; underground cables; conductor arrangements; earth return impedances; earth stratification; finite element method; multilayer soils; overhead power transmission lines; single-core power cable; transient responses; underground power cable; Electromagnetic transient analysis; finite-element method (FEM); nonhomogeneous earth; power cables; transmission-line modeling;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2008.923999
