Journal article Open Access

Measuring Cable Sheath Currents to Detect Defects in Cable Sheath Connections

Marina Adel


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    <subfield code="a">Hv. Cable; Sheath current, Earth disconnection; ATP software; defect detection in sheaths; earth disconnection; short-circuit in cable joints, link-box flooding; defect alarm</subfield>
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    <subfield code="a">&lt;p&gt;This paper presents a method for detecting different types of defects in the cable sheaths interconnected in a cross bonding configuration of a HV cable system installed in flat or trefoil layout using the sheath currents as input data. Three different defects have been analyzed: electric continuity loss of earth connection, short-circuit between sectionalized metal sheaths of a cable joint and link-box flooding. The sheath current has been calculated by two different approaches, one on the basis of theoretical equations, programed in MATLAB&amp;reg; and the other on the basis of ATP software simulating the cable system model. The results obtained using both methods have achieved a good agreement between them. A simple criterion by the means of a easy normalized code of four discrete levels 0, 1, 2 and 3 has been developed to distinguish the magnitude level of change of sheath currents in case of the indicated defect existence in&amp;nbsp; order to trigger alarm.&lt;/p&gt;</subfield>
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