Condition assessment of distribution PILC cables from electrical, chemical, and dielectric measurements

Cherukupalli, S.; Buchholz, V.; Colwell, M.; Crine, J.‐P.; Keefe, R.J.

doi:10.1109/mei.2004.1318834

Cited by 14 publications

(5 citation statements)

References 2 publications

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“…These values are far in excess of those expected in modern polyethylene insulated cables [4]. From studies on higher voltage cables [5] and transformer insulation systems it is clear that water ingress impacts dielectric performance of oilbased systems negatively [6][7][8]. Both dielectric permittivity and loss are enhanced in the power frequency range, and dc conductivity is increased markedly [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Fault Development in Wet, Low Voltage, Oil-Impregnated Paper Insulated Cables

Rowland

Wang

2008

IEEE Trans. Dielect. Electr. Insul.

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Few studies have been carried out on the failure processes of low voltage distribution cables. This is mainly due to their excellent track record of high reliability, and their use of traditional technologies. Growing quantities of aged cable within the network now make management of these assets an important issue. This paper describes measurements of leakage current, partial discharges and arc formation within 400 V oil-impregnated paper insulated cable structures which have been artificially wetted by immersion in bulk water. A generic picture is produced to show the gradual evolution from a leakage current through discharge growth to final catastrophic failure. Rapid changes to the core temperature of a wet cable are shown to produce transient, high levels of leakage current. It is also shown that by increasing the core temperature more slowly these high levels can be reduced. It is suggested that the characteristics of individual arcs within successive half cycles may provide a basis for predicting whether an incipient fault will lead to failure in the short term.

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Section: Introductionmentioning

confidence: 99%

Fault Development in Wet, Low Voltage, Oil-Impregnated Paper Insulated Cables

Rowland

Wang

2008

IEEE Trans. Dielect. Electr. Insul.

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“…However, other studies have shown that this statement may not be true for field aged oil-paper insulated cables [12]. The degradation by-products are polarized and it is hypothesized that their response may overcome the moisture response of FDS.…”

Section: Frequency Domain Spectroscopy (Fds)mentioning

confidence: 96%

Off-Line Field Diagnostics for MV and HV Oil-Paper Insulated Cables

Banerjee

Jahromi

Sedding³

2017

NORD-IS

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Focusing on off-line electrical diagnostics this paper presents a technical approach, including acceptance criteria options, for in-situ field condition assessment of MV paper insulated lead covered (PILC) cable and HV/EHV self-contained fluid-filled (SCFF) cables. The proposed approach consists of a combination of off-line AC Hipot, partial discharge (PD) measurement and frequency domain dielectric spectroscopy. Case studies illustrate the successful practical application of this technical approach for diagnostics and condition assessment, including replacement prioritization or 'return to service' decisions on critical cables.

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“…The major stress factors contributing to failure at both high and low voltage include chemical effects and thermal effects (oxidation, chain scission, cross-linking etc). In low voltage cables, these chemical and thermal stress factors provide the initiating mechanisms of failure, resulting in property changes to the insulation causing a reduction in the mechanical and electrical strengths [7,32,33], leading to eventual insulation failure. Furthermore, a high proportion of low voltage cable failures have been attributed to physical damage of the moisture barrier sheath of the cable, through excavation works or poor installation practice leading to moisture ingression and consequent chemical reactions [34].…”

Section: Application Of the Frameworkmentioning

confidence: 99%