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Mitigation of transient ground potential rise in gas insulated substations during very fast transient overvoltage

Alexandru, Muresan; Czumbil, Levente; Polycarpou, Alexis; Nouri, Hassan; Andolfato, Roberto; Micu, Dan D

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Authors

Muresan Alexandru

Levente Czumbil

Alexis Polycarpou

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Hassan Nouri Hassan.Nouri@uwe.ac.uk
Reader in Electrical Power and Energy

Roberto Andolfato

Dan D Micu



Abstract

This paper is focused on the assessment and mitigation of the transient response of a Gas Insulated Substation's (GIS) grounding grid to the fault due to voltage breakdown using the Partial Element Equivalent Circuit (PEEC) numerical approach. The adopted analysis methodology considers the magnetic induction by quantifying the electromagnetic couplings generated within the metallic components contained by the GIS configuration. The Transient Ground Potential Rise (TGPR) and transient current are computed and analyzed at several locations inside of GIS housing. With the aid of 3D graphical representation, the maximum amplitudes of the TGPR across the substation are illustrated. The mitigation efforts are considerably optimized by assuming the grounding grid sub-system is responsible for high frequency fault energy clearance based on identification method. By adopting several simplifications of the earthing system during the computational process, from a step-by-step analysis, it has been discovered that the grid located beneath the GIS enclosure will mostly attenuate the TGPR across the GIS building. Based on the aforementioned findings a successful mitigation technique is implemented.

Journal Article Type Article
Acceptance Date Feb 4, 2022
Online Publication Date Feb 5, 2022
Publication Date Jun 2, 2022
Deposit Date Feb 7, 2022
Publicly Available Date Feb 6, 2023
Journal Electric Power Systems Research
Print ISSN 0378-7796
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 207
Article Number 107824
DOI https://doi.org/10.1016/j.epsr.2022.107824
Public URL https://uwe-repository.worktribe.com/output/9003279

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