Andresson, Einar

Bak, Claus Leth

Einarsdottir, Kristin E.

Lykkegaard, Jan

M. Rasmussen, Jesper

Wiechowski, Wojciech Tomasz

This paper demonstrates the results from detailed studies of the physical layout of a substation earthing grid. The particular layout of a 400/150 kV substation is modelled in details in MATLAB by means of a thin-wire approach originally developed by J.H.Richmond in 1974 for NASA. A model of the surge arresters, the incoming overhead line and the transfomer is implemented in EMTDC/PSCAD and interconnected with the MATLAB simulation model of the earthingsystem in an iterative manner. Six different layout approaches for the earth grid in the vicinity of the surgearrester downconductor connections are analyzed with respect to lightning overvoltage at the transformer bushings and it is shown clearly that the layout of the grounding system in the vicinity of the surge arrester down conductors plays an important role for the magnitude of the transformer bushing overvoltage during lightnings striking the incoming overhead line

VBN (Videnbasen)  Aalborg Universitets forskningsportal

Transient electromagnetic simulations of substation earth grid for improving lightning withstand performance of a large power transformer

http://vbn.aau.dk/ws/files/13571895/Conference_paper

Transient electromagnetic simulations of substation earth grid for improving lightning withstand performance of a large power transformer

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VBN (Videnbasen) Aalborg Universitets forskningsportal