Ground Loop Impedance of Long EHV Cable Lines

Teruo Ohno, Claus Leth Bak, Thomas K. Sørensen

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Abstract

The distance protection scheme without communication is often applied to the backup protection of EHV cable lines. For a reliable operation of a ground distance relay, the ground loop impedance of EHV cable lines needs to have a linear relationship to the distance from the relay location to the fault
location.
The discontinuity of the ground loop impedance at cross-bonding points may have an ill effect on the reliable operation of the ground distance relay. However, the cause and parameters of the discontinuity and its effects on the ground distance relay protection have not been discussed in literature.
Through the calculation of the ground loop impedance for cable lines, it has been found that, for long EHV cable lines, the reliable operation of the ground distance relay is possible with a typical relay setting. Effects of parameters, such as substation grounding, cable layouts and transposition, are also found
through the analysis.
Original languageEnglish
Title of host publicationProceedings of Western Protective Relay Conference 2012
Number of pages12
Publication dateOct 2012
Publication statusPublished - Oct 2012
EventWestern Protective Relay Conference 2012 - Spokane, Washington, United States
Duration: 16 Oct 201218 Oct 2012

Conference

ConferenceWestern Protective Relay Conference 2012
CountryUnited States
CitySpokane, Washington
Period16/10/201218/10/2012

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    Ohno, T., Bak, C. L., & Sørensen, T. K. (2012). Ground Loop Impedance of Long EHV Cable Lines. In Proceedings of Western Protective Relay Conference 2012