Incomplete Cross-Bonding in the MV Line. Experience from the Operation of MV Single Cable Lines

Krzysztof Dobrzynski, Zbigniew Lubosny, Jacek Klucznik, Janusz Grala and Dominik Falkowski
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Krzysztof Dobrzynski: Faculty of Electrical and Control Engineering, Gdańsk University of Technology, Narutowicza 11/12, PL-80-233 Gdańsk, Poland
Zbigniew Lubosny: Faculty of Electrical and Control Engineering, Gdańsk University of Technology, Narutowicza 11/12, PL-80-233 Gdańsk, Poland
Jacek Klucznik: Faculty of Electrical and Control Engineering, Gdańsk University of Technology, Narutowicza 11/12, PL-80-233 Gdańsk, Poland
Janusz Grala: ENERGA-OPERATOR SA, Marynarki Polskiej 130, PL-80-557 Gdańsk, Poland
Dominik Falkowski: ENERGA-OPERATOR SA, Marynarki Polskiej 130, PL-80-557 Gdańsk, Poland

Energies, 2020, vol. 13, issue 20, 1-19

Abstract: Cable lines are one of the basic components of power systems. Medium and high voltage cables mainly comprise a metallic sheath, which is concentric to the main core conductor. There are several operating schemes of such cable lines, which differ in the place of earthing of sheaths and the possible use of the sheaths and/or conductors crossing. The sheaths cross-bonding is typically done in two places of one cable line section, and it allows to reduce power losses. Nevertheless, the use of incomplete sheaths crossing—only in one place on cable route may have economic justification. The paper presents an incomplete sheaths cross-bonding analysis of an existing medium voltage cable line. The results obtained by the mathematical model are validated by measurements taken on 30 October 2019 on an existing cable line. Measurements recorded on a real object for various systems of crossing sheaths are presented. The influence of incorrect sheaths crossing on the measured quantities was shown. In addition, the risk of excess voltage on the sheaths during short-circuits has been verified using a mathematical model.

Keywords: MV cable line; induced sheath voltage; induced sheath current; cross-bonding (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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