The behavior of water in XLPE and EPR cables and its influence on the electric characteristics of insulation

Nikolajevic, S.V.

doi:10.1109/61.736677

Cited by 18 publications

(5 citation statements)

References 4 publications

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“…It was shown that a spherical conducting particle could increase the electric field concentration to a maximum of 14.43 kV/mm in the present cable geometry. Reported breakdown strengths of EPR are in the region 30-40 kV/mm [12]- [15], with the probability of breakdown increasing with temperature, ageing time and moisture content. Breakdown strength for EPR has been reported to reduce to around 20 kV/mm for ageing times over 11000 hours and with a moisture content of around 1.4 % and greater [12].…”

Section: Discussionmentioning

confidence: 99%

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: 99%

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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“…When moisture invades extruded dielectrics such as cross -linked polyethylene (XLPE) or ethylene-propylene rubber (EPR), breakdown patterns resembling a tree reduce the voltage withstand capability of the cable and the probability of dielectric breakdown increases, and consequently, the failure rate of the cable is increased. The severity of treeing is strongly correlated with thermal age since mo isture absorption occurs more rapid ly at high temperatures [11].…”

Section: Impact Of Dg and Capacitor Placement On Reliability Enhancementmentioning

confidence: 99%

Placement of DG and Capacitor for Loss Reduction, Reliability and Voltage Improvement in Distribution Networks Using BPSO

Baghipour¹,

Hosseini²

2012

IJISA

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Abstract-This paper presents mult i-object ive function for optimally determining the size and location of distributed generation (DG) and capacitor in distribution systems for power loss minimizat ion, reliability and voltage imp rovement. The objective function proposed in this paper includes reliab ility index, active power loss index, DG's and capacitor's investment cost index and voltage profile index which is minimized using binary particle swarm optimization algorith m (BPSO). The effectiveness of the proposed method is examined in the 10 and 33 bus test systems and comparative studies are conducted before and after DG and capacitor installation in the test systems. Results illustrate significant losses reduction and voltage profile and reliab ility imp rovement with presence of DG unit and capacitor.

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“…The water can be put in cable conductors during cable manufacture, transportation, stocking, laying, service, etc. [10]. The existence of moisture in cables surroundings may affect the basic characteristics of the insulating material and therefore the reliability of XLPE insulated cables.…”

Section: Introductionmentioning

confidence: 99%

Influence of moisture on the electrical properties of XLPE insulation

Mecheri

Nedjar

Lamure

et al. 2010

2010 Annual Report Conference on Electrical Insulation and Dielectic Phenomena

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. Abstract-During their operating service, insulated power cables can be exposed to wet environment. The presence of moisture in cables surroundings may affect the properties of the used insulation material for instance, XLPE widely employed in MV and HV power cables insulation and therefore the reliability of the insulated cables. In order to examine the influence of wet aging conditions on the performances of XLPE insulated cables, samples (plates moulded from granules HFDE 4201-EC) of the same insulation material were exposed during 5600 hours to wet environment inside a cell simulating moisture. The XLPE material used in the present investigation is employed as insulation for medium voltage (MV) cables (18 / 30 kV). This work presents the results of the effect of aging under wet conditions on the electrical properties of XLPE. The goal of this paper was to investigate the eventual degradation of XLPE insulation under humidity effect by characterization techniques. For this purpose, measurements of dielectric losses factor, relative permittivity, volume resistivity and dielectric strength were performed. Influence of Moisture on the Electrical Properties of XLPE Insulation

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The behavior of water in XLPE and EPR cables and its influence on the electric characteristics of insulation

Cited by 18 publications

References 4 publications

Fault location and diagnosis in a medium voltage EPR power cable

Fault location and diagnosis in a medium voltage EPR power cable

Placement of DG and Capacitor for Loss Reduction, Reliability and Voltage Improvement in Distribution Networks Using BPSO

Influence of moisture on the electrical properties of XLPE insulation

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