Dielectric spectroscopy for diagnosis of water tree deterioration in XLPE cables

Werelius, P.; Tharning, P.; Eriksson, R.; Holmgren, B.; Gäfvert, U.

doi:10.1109/94.910423

Cited by 133 publications

(75 citation statements)

References 8 publications

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“…Comparing two diagnostic programs would yield a mixture between reliability, corrective action, and testing savings as shown in (28).…”

Section: Alternative Diagnostic Programmentioning

confidence: 99%

“…The frequency is then stepped to cover the complete frequency range. The data may be interpreted as frequency spectra [28] or via equivalent circuit models [33,39]. The equivalent circuit model translates the measured "complex" current into a "complex" permittivity where the real part of the permittivity represents the direct capacitance and the imaginary part represents the resistive or loss component.…”

Section: How It Workmentioning

confidence: 99%

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Cable Diagnostic Focused Initiative

Hartlein¹,

Hampton²

2010

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“…Comparing two diagnostic programs would yield a mixture between reliability, corrective action, and testing savings as shown in (28).…”

Section: Alternative Diagnostic Programmentioning

confidence: 99%

Section: How It Workmentioning

confidence: 99%

Cable Diagnostic Focused Initiative

Hartlein¹,

Hampton²

2010

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“…Before the measurements are presented, the VDP method is presented below with abbreviations adopted from [2,4,7]:…”

Section: A Theorymentioning

confidence: 99%

“…Though some publications exist on utilization of the nonlinearity of frequency domain dielectric spectroscopy with respect to water tree detection in XLPE cables [1][2][3][4][5][6][7], it is still regarded as a fairly new method according to a recent survey [8] and thus further verification should be appreciated.…”

Section: Introductionmentioning

confidence: 99%

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Laboratory Results from Dielectric Spectroscopy of Field Aged XLPE Cables with Respect to Water Trees

Pedersen

Sedding²,

Fenger³

et al.

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation

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Abstract-This paper deals with the application of frequency domain dielectric spectroscopy for the detection of water trees in XLPE cables. During the research, dielectric spectroscopy measurements have been carried out on cable samples with and without water trees while it was attempted to preserve many of the uncertainties present in the field. The experiments support the applicability of a high voltage test developed primarily at KTH in Sweden, which utilizes the nonlinearity of the dissipation factor. Subsequently it was investigated whether this high voltage method also seems reliable at low voltages. It turned out that the fundamentals of the high voltage method were not directly applicable at low voltages as the nonlinearity of the permittivity is not noticeable at low voltages, at least compared to the deviations. Instead a novel method for interpreting the low frequency measurements is proposed though it needs further verification. Finally a theoretically possible modification of the measurement system is proposed, which deals with the problem of a limited current capability of the amplifier.

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Water‐tree aging characteristics of chloroacetic acid allyl ester grafted crosslinked polyethylene

Ma,

Zhang,

et al. 2024

Polymer Engineering & Sci

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To investigate the inhibition effect of chloroacetic acid allyl ester (CAAE) grafting modification on water‐tree aging in crosslinked polyethylene (XLPE), CAAE grafted XLPE (XLPE‐g‐CAAE) with different CAAE contents are prepared by melt blending and grafting modification method. The accelerated water‐tree aging experiments are carried out by the water‐blade electrode method. It is found that XLPE‐g‐CAAE has a great inhibitory effect on the water‐tree aging compared to XLPE, and XLPE‐g‐CAAE with 1.0 phr CAAE has the most significant effect on the water‐tree growth in the scope of the study. The microstructure of XLPE and XLPE‐g‐CAAE is investigated by thermal elongation, gel content, and static water contact angle, respectively. The results show that the grafting of CAAE containing polar groups can enhance the polarity of XLPE and improve the hydrophilicity, which has a dispersing effect on the polar water molecules entering the polymer. Thus, the water molecules are not easy to gather, inhibiting the water‐tree growth. Meanwhile, although the mechanical properties of XLPE‐g‐CAAE decrease to a small extent, and the relative dielectric constant and dielectric loss factor increase slightly, but the performance still meet the requirements of water‐tree resistance XLPE cable insulation.Highlights CAAE with polar groups was successfully grafted onto XLPE. The polar groups can enhance the polarity of XLPE to improve the hydrophilicity. CAAE grafting can inhibit the water‐tree growth in XLPE. The dielectric properties meet the requirements of water‐tree resistance XLPE.

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Dielectric spectroscopy for diagnosis of water tree deterioration in XLPE cables

Cited by 133 publications

References 8 publications

Cable Diagnostic Focused Initiative

Cable Diagnostic Focused Initiative

Laboratory Results from Dielectric Spectroscopy of Field Aged XLPE Cables with Respect to Water Trees

Water‐tree aging characteristics of chloroacetic acid allyl ester grafted crosslinked polyethylene

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