Corona caused deterioration of ADSS fiber-optic cables on high voltage lines

Karady, G.G.; Besztercey, G.; Tuominen, M.W.

doi:10.1109/61.796238

Cited by 30 publications

(9 citation statements)

References 1 publication

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“…One example is the severity of the damage caused by dry band arcing on all dielectric self supporting fiber optic cables (ADSS) [1]. Whilst this particular problem can now be successfully mitigated by stress relieving rods [2], these are clearly not practical to install on overhead insulator strings, generator windings or the lightweight composites currently employed in aircraft construction.…”

Section: Introductionmentioning

confidence: 99%

Laser ablation of polymeric composites

Hosier

Rahman

Westenbrink

et al. 2010

2010 10th IEEE International Conference on Solid Dielectrics

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Degradation of polymeric insulation due to surface electrical discharge activity will become a more serious issue, as these materials find more widespread use. In order to improve their resistance to degradation, tests need to be performed under controlled conditions in order to rank different materials. Whilst electrical discharge activity can be simulated in the laboratory this is difficult to localize and characterize. An alternative is to use a laser to impart a known amount of energy at a known rate to a sample surface. In this investigation, the resistance of various material formulations to laser induced surface damage was tested and the materials ranked. The results are discussed in terms of the material composition and final application.

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Section: Introductionmentioning

confidence: 99%

Laser ablation of polymeric composites

Hosier

Rahman

Westenbrink

et al. 2010

2010 10th IEEE International Conference on Solid Dielectrics

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“…(5) In the case reported here, the program provided a sufficiently accurate estimate of the nonuniform fields for estimating exposure in the climbing space of a lattice steel structure.…”

Section: Field Calculationmentioning

confidence: 98%

Evaluating Occupational 60-Hertz Electric-Field Exposures for Guideline Compliance

Bracken¹,

Senior²,

Tuominen

2004

Journal of Occupational and Environmental Hygiene

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This article examines determination of compliance of 60-Hz electric-field exposures with occupational guideline limits. The guidelines are expressed as a limit on the unperturbed electric field without allowance for the severity of potential spark discharges. A line worker on a 500-kV transmission-line tower provided a practical example of an occupational exposure. In this realistic case, the worker's posture, the uniformity of the field, and the field orientation differed from the guideline exposure scenario of standing erect in a vertical uniform field. An accurate estimate of the unperturbed nonuniform fields in the climbing space of a lattice steel structure was computed using Monte Carlo methods that modeled surface and spatial electric fields on and near standard geometrical elements. Fields were computed at 20 points in a three-dimensional array, simulating the location of the human body on the tower. We estimated the average unperturbed electric field, space potential, induced short-circuit current, induced open-circuit voltage, and the stored charge and energy available for a discharge over a range of capacitances to ground. The on-tower exposure parameters were compared with those from the idealistic guideline exposure scenario. The average electric field of 24.4 kV/m for the on-tower exposure exceeded the limit of 20 kV/m stated in the recently adopted IEEE Standard C95.6 2002. However, the charge available for a spark discharge during the on-tower exposure was less than that for the guideline exposure scenario. Thus, for an exposure limit based on a constant-charge criterion for adverse reaction to spark discharges, guideline on-tower exposure would be below the limit established for the guideline exposure scenario. Evaluation of electric-field exposures in terms of the charge associated with spark discharges provides a means of comparing any electric-field exposure scenario with the ideal guideline scenario in terms of an effects-related physical quantity. This approach is consistent with the exposure limit/basic restriction methodology that employs a basic restriction on a physical quantity as the ultimate determinant of compliance.

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“…However, unlike glass and ceramics, polymers can be readily damaged through localized surface discharge activity resulting from corona or partial discharge activity following weathering and wetting. This is a particular issue in outdoor applications and in the past, dry band arcing has been a serious issue, for example, in all dielectric self supporting fiber optic cables [1,2]. Whilst this problem can now be mitigated by technological means [3], the same measures cannot be employed on other high voltage components such as bushings, insulator strings and generator windings, all of which could suffer similar damage due to localized electrical discharge activity.…”

Section: Introductionmentioning

confidence: 96%

“…polarity dependence), erosion of the anode was an issue requiring replacement of electrodes for each test and finally the surface condition and liquid conductivity are both critical in determining the effective series resistance and hence the total arc current. Whilst laser ablation does not suffer from these complications and offers a way of applying a constant, known power to a surface, it clearly does not adequately represent the complex interplay of material and environmental factors inherent to inclined plane tracking tests [6,11] and outdoor insulation systems exposed to sunlight and weathering [1,2]. These differences may be more serious in porous and/or fibrous materials where additional heating may occur in inclined plane tracking tests due to internal discharges which would not have any analogue in the corresponding laser ablation tests.…”

Section: Introductionmentioning

confidence: 98%

Comparison of laser ablation and inclined plane tracking tests as a means to rank materials for outdoor HV insulators

Hosier

Rahman

Vaughan

et al. 2013

IEEE Trans. Dielect. Electr. Insul.

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As the popularity of polymeric composites for outdoor high voltage (HV) use continues to increase, surface degradation through electrical discharge activity is becoming a more serious issue. In order to design composites offering improved resistance to degradation, and hence improved component lifetimes, tests need to be performed under controlled conditions in order to rank different materials. Inclined plane tracking tests are often used to determine the relative performance of various material formulations used in their construction. An alternative approach is to employ a high power laser to deposit known amounts of energy at a known rate to the sample surface. In this paper a variety of material formulations were subjected to inclined plane tracking tests as well as to laser ablation testing. The results indicate that the two test methods compare favorably and that laser ablation offers a quick and cost effective way of screening candidate material formulations, prior to more detailed study.

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Corona caused deterioration of ADSS fiber-optic cables on high voltage lines

Cited by 30 publications

References 1 publication

Laser ablation of polymeric composites

Laser ablation of polymeric composites

Evaluating Occupational 60-Hertz Electric-Field Exposures for Guideline Compliance

Comparison of laser ablation and inclined plane tracking tests as a means to rank materials for outdoor HV insulators

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