Distance protection of multiple-circuit shared tower transmission lines with different voltages and underground cable sections

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Resumé

Multiple-circuit transmission lines combining different voltage levels in one tower present extra challenges when setting a protection philosophy, as faults between voltage levels are possible. This study analyses faults in multiple-circuit transmission lines that are partly underground cable, by investigating the impact of the cable section on the fault current magnitude and operation of distance protection relays, without pilot scheme. The study shows that a cable's bonding configuration and layout have a small impact on the short-circuit magnitude, whereas the screen's grounding impedance and the presence of an earth continuity conductor impact the fault current magnitude. It was also demonstrated that distance protection relays settings used to protect the higher voltage line against single-phase-to-ground faults are capable of protecting the line against combined faults, for typical line configurations and short-circuit powers.
OriginalsprogEngelsk
TidsskriftThe Journal of Engineering
Vol/bind2018
Udgave nummer15
Sider (fra-til)961-966
Antal sider6
ISSN2051-3305
DOI
StatusUdgivet - okt. 2018
BegivenhedThe 14th International Conference on Developments in Power System Protection - The Europa Hotel, Belfast, Storbritannien
Varighed: 12 mar. 201815 mar. 2018
Konferencens nummer: 14

Konference

KonferenceThe 14th International Conference on Developments in Power System Protection
Nummer14
LokationThe Europa Hotel
LandStorbritannien
ByBelfast
Periode12/03/201815/03/2018

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Underground cables
Towers
Electric lines
Relay protection
Electric fault currents
Short circuit currents
Networks (circuits)
Cables
Electric potential
Electric grounding
Earth (planet)

Citer dette

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title = "Distance protection of multiple-circuit shared tower transmission lines with different voltages and underground cable sections",
abstract = "Multiple-circuit transmission lines combining different voltage levels in one tower present extra challenges when setting a protection philosophy, as faults between voltage levels are possible. This study analyses faults in multiple-circuit transmission lines that are partly underground cable, by investigating the impact of the cable section on the fault current magnitude and operation of distance protection relays, without pilot scheme. The study shows that a cable's bonding configuration and layout have a small impact on the short-circuit magnitude, whereas the screen's grounding impedance and the presence of an earth continuity conductor impact the fault current magnitude. It was also demonstrated that distance protection relays settings used to protect the higher voltage line against single-phase-to-ground faults are capable of protecting the line against combined faults, for typical line configurations and short-circuit powers.",
author = "Silva, {Filipe Miguel Faria da} and Bak, {Claus Leth} and Bjarne Bukh",
year = "2018",
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Distance protection of multiple-circuit shared tower transmission lines with different voltages and underground cable sections. / Silva, Filipe Miguel Faria da; Bak, Claus Leth; Bukh, Bjarne.

I: The Journal of Engineering, Bind 2018, Nr. 15, 10.2018, s. 961-966.

Publikation: Bidrag til tidsskriftKonferenceartikel i tidsskriftForskningpeer review

TY - GEN

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AU - Bukh, Bjarne

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AB - Multiple-circuit transmission lines combining different voltage levels in one tower present extra challenges when setting a protection philosophy, as faults between voltage levels are possible. This study analyses faults in multiple-circuit transmission lines that are partly underground cable, by investigating the impact of the cable section on the fault current magnitude and operation of distance protection relays, without pilot scheme. The study shows that a cable's bonding configuration and layout have a small impact on the short-circuit magnitude, whereas the screen's grounding impedance and the presence of an earth continuity conductor impact the fault current magnitude. It was also demonstrated that distance protection relays settings used to protect the higher voltage line against single-phase-to-ground faults are capable of protecting the line against combined faults, for typical line configurations and short-circuit powers.

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