Modeling of Currents on Long Span, Dielectric Cables on HV Overhead Lines

Rowland, S. M.; Kopsidas, Konstantinos; Cotton, Ian

doi:10.1109/tpwrd.2007.893434

Cited by 6 publications

(2 citation statements)

References 8 publications

(22 reference statements)

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“…However, the induced voltage levels on the ADSS cable are summarized in Table I. The software used for these calculations has been verified against other software and field measurements [4]. …”

Section: Electrical Field Calculationmentioning

confidence: 99%

Ageing of an ADSS Cable Sheath on a 132kV Overhead Transmission Line

Rowland

Zhang

Kopsidas

2008

2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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All-dielectric self-supporting (ADSS) optical cables are widely used in modern power utilities to provide communication infrastructure. These are able to provide a reliable highbandwidth network because of the physical immunity of the embedded optic fibres from their electrical environment. However, the cable sheath and strength member are not immune to the electrical environment due to induced surface currents. These currents inevitably arise as a result of capacitive coupling to the phase conductors. These low level currents can degrade the cable sheath from a hydrophobic to a hydrophilic state, which increases the likelihood of surface electrical discharge phenomena such as corona or even dry-band arcing. In this paper, the sheath of cable which was installed for 15 years on a 132kV transmission line, but has not failed, is analyzed. Models of the surface current experienced by the ADSS cable are used to reveal how the electrical environment influences the cable surface ageing. Characterization of the cable surface by visual inspection and by contact angle measurement along the cable span is reported. These are the first measurements of this sort and surprisingly, the predictions of leakage current magnitude correlate strongly with reductions in contact angle within a span. The measurements verify that long-term low surface current is one significant aspect attributing to the ageing of cable surface properties, even if the conditions are such that dry-band arcing does not occur.

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Section: Electrical Field Calculationmentioning

confidence: 99%

Ageing of an ADSS Cable Sheath on a 132kV Overhead Transmission Line

Rowland

Zhang

Kopsidas

2008

2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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“…A number of models enabling predictions of currents and fields experienced by cables have been generated [4,18,19] and one of these has been verified on a full-scale installation [19]. More complete models have shown the complexity of the complete picture in which maximum currents are not necessarily seen at the towers in some conditions [20,21].…”

Section: Dry-band Arcingmentioning

confidence: 99%

Prevention of dry-band arc damage on ADSS cables

Rowland

2006

IEEE Trans. Dielect. Electr. Insul.

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All-dielectric cables separately suspended along high voltage overhead transmission routes are vulnerable to ageing through dry-band arcing. The differences between this process and dry-band arcing on traditional high voltage insulators are reviewed. Solutions to the problem on all-dielectric self supporting (ADSS) cables which involve the introduction of controlled conductivity into the cable are considered. Analysis suggests that arcs which are both electrically stable and spatially confined must be avoided. It is shown that the cable can be protected by limiting either the current or the voltage available to an arc. These considerations reveal that a semiconductive element does not have to cover the whole cable length to provide effective protection against dry-band arcing in this application.

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