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

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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.
Original languageEnglish
JournalThe Journal of Engineering
Volume2018
Issue number15
Pages (from-to)961-966
Number of pages6
ISSN2051-3305
DOIs
Publication statusPublished - Oct 2018
EventThe 14th International Conference on Developments in Power System Protection - The Europa Hotel, Belfast, United Kingdom
Duration: 12 Mar 201815 Mar 2018
Conference number: 14

Conference

ConferenceThe 14th International Conference on Developments in Power System Protection
Number14
LocationThe Europa Hotel
Country/TerritoryUnited Kingdom
CityBelfast
Period12/03/201815/03/2018

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