Fundamentals of partial discharge in the context of field cable testing

Boggs, S.A.; Densley, J.

doi:10.1109/57.871416

Cited by 130 publications

(48 citation statements)

References 13 publications

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“…X-ray computed tomography has shown the presence of numerous high density particles embedded in the dielectric layer. The maximum contaminant diameter in the region under examination was 310 μm and the average contaminant density was 1 particles per 2.28 mm 3 . The minimum insulation thickness in the breakdown region was found to fall below the minimum acceptable value specified in the BS6622 standard, and although no requirement for allowable contaminant levels was specified in this standard, comparison with similar standards, which do specify a minimum contaminant diameter, shows that the cable would have failed in this regard also.…”

Section: Discussionmentioning

confidence: 95%

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Fault location and diagnosis in a medium voltage EPR power cable

Reid

Zhou

Hepburn

et al. 2013

IEEE Trans. Dielect. Electr. Insul.

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This version is available at https://strathprints.strath.ac.uk/39527/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. Fault Location and Diagnosis in a Medium ABSTRACTThis paper presents a case study on fault location, characterisation and diagnosis in a length of shielded 11 kV medium voltage ethylene-propylene rubber (EPR) power cable. The defect was identified on-site as a low resistance fault occurring between the sheath and the core. A 43 m section was removed for further analysis. The fault resistance was characterised and the location of the defect pinpointed to within a few cm using a combination of time-difference-of-arrival location and infra-red imaging. A combination of X-ray computed tomography, scanning electron microscopy and energy dispersive X-ray spectroscopy were then applied to characterise any abnormalities in the dielectric surrounding the breakdown region. A significant number of high density contaminants were found to be embedded in the dielectric layer, having an average diameter of the order of 100 μm, a maximum diameter of 310 μm and an average density of 1 particle per 2.28 mm 3 . Scanning electron microscopy and energy-dispersive X-ray spectroscopy were used to determine the geometry and elemental composition of some initial contaminant samples. It was concluded that contamination of the EPR layer, combined with an observed eccentricity of the cable's core and sheath resulting in a reduced insulation gap, may have led to an electric field concentration in the region of the defect sufficient to initiate breakdown. Preventative strategies are discussed for similar families of cables, including more stringent dielectric testing requirements at the manufacturing stage and PD monitoring to detect incipient failure.

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Section: Discussionmentioning

confidence: 95%

“…Setting the low-density insulation region as a semitransparent layer reveals the embedded contaminants. The average particle density in this region is 1 particle per 2.28 mm 3 .…”

Section: V / 50kvmentioning

confidence: 95%

Fault location and diagnosis in a medium voltage EPR power cable

Reid

Zhou

Hepburn

et al. 2013

IEEE Trans. Dielect. Electr. Insul.

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“…As the ionization process is very localized and the number of charges generated stays well below the streamer inception criterion, the whole phenomenon is called micro discharge [8]. These small discharges are below the measurement threshold of a classical PD circuit [21] and of any current measurement device.…”

Section: 13mentioning

confidence: 99%

Micro discharges in HVDC gas insulated systems

Schueller

Gremaud

Doiron

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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“…While continuous conditions may slowly degrade a cable's withstand voltage, transients are usually what exceeds the degraded level. Longterm degradation is manifested as slow charge migration [2] or changes in the partial discharge spectrum [3,4].…”

Section: Introductionmentioning

confidence: 99%

Performance assurance for DC cables for electric ships

Hebner

Gattozzi

Pekarek

2015

2015 IEEE Electric Ship Technologies Symposium (ESTS)

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Abstract-Minimizing the weight and volume in a ship cable plant improves system efficiency or provides the capability to carry more critical payloads. Cabling should be as small as possible. This research developed an approach to the fundamental understanding needed to design, specify, and test cabling that has the minimum prudent size with high reliability. Progress requires a convolution of the failure modes with the thermal, electrical, and mechanical environment in which the cable is operating.

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Fundamentals of partial discharge in the context of field cable testing

Cited by 130 publications

References 13 publications

Fault location and diagnosis in a medium voltage EPR power cable

Fault location and diagnosis in a medium voltage EPR power cable

Micro discharges in HVDC gas insulated systems

Performance assurance for DC cables for electric ships

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