Open AccessAnalytical study of the frequency‐dependent earth conduction effects on underground power cables
Author(s) -
Papadopoulos Theofilos A.,
Chrysochos Andreas I.,
Papagiannis Grigoris K.
Publication year - 2013
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2012.0425
Subject(s) - transient (computer programming) , admittance , electric power transmission , electrical impedance , transmission line , electrical conductor , ground , skin effect , limit (mathematics) , overhead (engineering) , overhead line , computer science , engineering , electrical engineering , mathematics , telecommunications , mathematical analysis , operating system
In electromagnetic transient analysis, one major issue is the influence of the imperfect earth on the propagation characteristics of transmission line conductors. Extensive research has been published for overhead lines, whereas the corresponding literature for underground cables is significantly less. Recently, new expressions for the calculation of the ground impedance and admittance have been proposed for the homogeneous and the stratified earth case. However, most transient simulation programs still use approximate earth representations. Scope of this study is to compare the proposed formulation with the corresponding approximations, in order to introduce a frequency limit for the use of the approximate earth models, sas well as criteria that dictate the use of a stratified earth model. The resulting propagation characteristics are used in transient calculations, in order to validate the effect of the differences by the various approaches and the need to include a more accurate model in the simulation of underground cable transients.