access icon openaccess Application of tower grounding device equivalent model in the calculation of transmission line back-flashover

This is an open access article published by the IET under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Received 04/09/2018, Accepted 19/09/2018, Published 24/10/2018

The modelling of tower grounding device is the key for calculation of lightning strike response and lightning withstand level. In order to solve this problem, this study proposes a method to calculate the lightning response of transmission line grounding device by combining the advantages of CDEGS and EMTP software. Firstly, the authors calculate the frequency domain response of the tower grounding model in CDEGS; then the result is fitted according to modified vector fitting method to obtain the rational approximation expression of the impedance function. Furtherly, the corresponding equivalent circuits of tower grounding device is established in EMTP to realise accurate simulation of grounding device lightning strike response. The results show that the equivalent circuit model is more accurate than non-linear resistance model. Then, the factors that influence the lightning response and lightning withstand level are analysed based on the above method according to an actual transmission line model, which can provide reference for the lightning protection and grounding design.

Inspec keywords: earthing; power transmission lines; EMTP; flashover; power transmission protection; approximation theory; vectors; poles and towers; lightning protection; equivalent circuits

Other keywords: equivalent circuit model; CDEGS; lightning strike response calculation; rational approximation expression; frequency domain response; transmission line grounding device; grounding design; lightning withstand level calculation; transmission line back-flashover calculation; actual transmission line model; modified vector fitting method; lightning protection; tower grounding model; EMTP software; impedance function; tower grounding device equivalent model

Subjects: Interpolation and function approximation (numerical analysis); Linear algebra (numerical analysis); Power line supports, insulators and connectors; Power system protection; General circuit analysis and synthesis methods

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