NDLI: Distance protection of multiple-circuit shared tower transmission lines with different voltages

Content Provider	IET Digital Library
Author	Silva, Filipe Faria Da Bak, Claus Leth
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. In this study, the fault loop impedance of combined faults is compared with the fault loop impedance of single-phase-to-ground faults and it is demonstrated that they are similar for high short-circuit powers; however, the fault loop impedance of a combined fault may increase substantially as the short-circuit power of the system decreases, a behaviour that is less noticeable for single-phase-to-ground faults. It is also demonstrated that the fault loop impedance of combined faults is more resistive, when compared with equivalent single-phase-to-ground faults. It is concluded that the settings used to protect a line against single-phase-to-ground faults are capable of protecting the line against combined faults, being advised to increase the resistive limit of the protection zone, if the network has lower short-circuit power. It is recommended to assure that the fault can only happen for cases where the faulted phase from the higher voltage level leads the faulted phase from the lower voltage level, if the length of the line at lower voltage level is smaller than of the line at higher voltage level.
Starting Page	2626
Ending Page	2632
Page Count	7
ISSN	17518687
Volume Number	11
e-ISSN	17518695
Issue Number	Issue 10, Jul (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/11/10
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2016.1764
Journal	IET Generation, Transmission & Distribution
Publisher Date	2017-03-03
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Connector Distance Protection Electric Impedance Fault Loop Impedance Insulator Line Protection Multiple-circuit Shared Tower Transmission Line Poles And Towers Power Line Supports Power System Protection Power Transmission Fault Power Transmission Line Power Transmission Protection Short-circuit Current Short-circuit Powers Single-phase-to-ground Fault
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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Distance protection of multiple-circuit shared tower transmission lines with different voltages – Part I: fault current magnitude

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Deploying correct fault loop in distance protection of multiple-circuit shared tower transmission lines with different voltages

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Distance protection of multiple-circuit shared tower transmission lines with different voltages – Part II: fault loop impedance

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