Return paths of earth faults current in medium voltage grids with underground shielded cables

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CIRED 2019 - 1081.pdf (964.71 KB)

Paper number

1081

Working Group Number

Conference name

CIRED 2019

Conference date

3-6 June 2019

Conference location

Madrid, Spain

Peer-reviewed

Yes

Short title

Convener

Authors

ANTOINE, Quentin , ENGIE Laborelec, Belgium
Hennuy, Blandine, ENGIE-Laborelec, Belgium
Valmacco, David, RESA, Belgium
Finotto, Walter, Fluvius, Belgium

Abstract

The design of earthing schemes in Belgian MV networks was established in the past based on the electrical knowledge of the time and has led to the implementation of a certain earthing strategy, around the idea of global earthing. New simulation tools lately have allowed for a more detailed modelling and analysis of the fault current return paths and it appears that the impacts of the conductors’ metallic screens have been underestimated.It appears that in a configuration thanks to which the fault current can return via a continuous path of interconnected screens all the way back to the earthing transformer, most if not all of the fault current will return via this path rather than via the multiple earth connections. This is due to a suction effect induced by the fault current in the conductors, following Lenz law. Several use cases have been investigated and tend to confirm this conclusion.

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Publisher

AIM

Date

2019-06-03

Published in

CIRED 2019 Conference

Permanent link to this record

https://cired-repository.org/handle/20.500.12455/283
http://dx.doi.org/10.34890/511

ISSN

2032-9644

ISBN

978-2-9602415-0-1