Ground grid design of a transition station system-a typical example of fault transfer

Author

Villas, J.E.T. ; Mukhedkar, D. ; Fernandes, V.R. ; Magalhaes, A.C.

Author_Institution

Main Engenharia S/A, Brasilia, Brazil

Volume

5

Issue

1

fYear

1990

fDate

1/1/1990 12:00:00 AM

Firstpage

124

Lastpage

129

Abstract

E.T.D. Barra Funda I urban station, located in Sao Paulo, Brazil, is surrounded by several buildings, so it is not possible to make reliable earth resistivity and ground electrode resistance measurements. The grounding of this station was designed by using external circuits connected to the ground mat (sheaths and bare copper bondings). The use of these circuits allows a transfer of the fault potentials from E.T.D. Barra Funda I to E.T.R. Barra Funda II due to a strong cable shielding. A discussion is presented of the basic procedures adopted for controlling the potential rise at the E.T.D. Barra Funda I station in order to ensure the safety of people and equipment during the occurrence of a fault to the ground. This study deals with such design aspects as: high short-circuit level, high soil resistivity and backup protection time, and reduced area for diffusion of short-circuit current

Keywords

earthing; safety; substations; Brazil; ETD Barra Funda I urban station; Sao Paulo; backup protection time; earth resistivity measurements; fault transfer; ground electrode resistance measurements; ground grid design; ground mat; safety; short-circuit current; short-circuit level; soil resistivity; substations; transition station system; Bonding; Buildings; Cable shielding; Circuit faults; Conductivity; Copper; Electrical resistance measurement; Electrodes; Grounding; Satellite ground stations;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.107264

Filename

107264