Transient current measurement for the detection of water tree growth in polymeric power cables

Li, H.M.; Fouracre, R.A.; Crichton, B.H.

doi:10.1109/94.469980

Cited by 13 publications

(3 citation statements)

References 14 publications

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“…The ion irradiation causes the formation of a cross-linked structure at these sites which lead to γ -relaxation process. The current reversal may also be related to the homopolar charge injection interfering with the second peak which results in the production of a current of opposite sign to the normally measured currents (16). The current reversal that appears here can be correlated with the internally developed field in the sample as the applied electric field is not very high.…”

Section: Methodsmentioning

confidence: 88%

Effect of water absorption on pristine and ion-irradiated kapton-H polyimide using thermally stimulated depolarization current technique

Sharma

Quamara

2013

Radiation Effects and Defects in Solids

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In this paper we report the effect of water absorption on pristine and 75 MeV oxygen ion-irradiated kapton-H polyimide by using the thermally stimulated depolarization current (TSDC) technique. The TSDC spectra reveal two significant peaks at low and intermediate temperatures around 30 • C and 110 • C termed as γ -peak (absorbed water-relaxation) and β-peak (dipolar-relaxation), respectively. The strength of the low-temperature peak (γ -peak) is affected in the opposite mode for pristine and ion-irradiated samples. A current reversal has been observed at 60 • C almost in all the cases; this can be associated with the presence of homocharges. The current reversal that appears here can be correlated with the internally developed field in the sample as the applied electric field is not very high. Activation energy has been calculated by using the Debye relaxation process. The value of activation energy for the γ -peak varies from 0.4 to 0.8 eV. Cole-Cole distribution, a relaxation process, is associated with distribution of relaxation time which can be measured using a distribution function. The enhancement in the distribution of τ can be associated with the dipolar relaxation process owing to the formation of some new radiation-induced sub-polar groups.

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Section: Methodsmentioning

confidence: 88%

Effect of water absorption on pristine and ion-irradiated kapton-H polyimide using thermally stimulated depolarization current technique

Sharma

Quamara

2013

Radiation Effects and Defects in Solids

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“…Based on the dielectric polarisation theories, the dielectric response method is widely used for the detection of water trees [7–9] and can be divided into the frequency domain method [10–12] and the time domain method [13]. Hvidsten et al.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the dielectric polarisation theories, the dielectric response method is widely used for the detection of water trees [7][8][9] and can be divided into the frequency domain method [10][11][12] and the time domain method [13]. Hvidsten et al found that the tangent value of dielectric loss angle of insulating material increased with water tree ageing and showed strong non-linear characteristics [14].…”

Section: Introductionmentioning

confidence: 99%

A novel characterization method for water trees based on the transmission characteristics of complementary split ring resonators

Xiao

Wang

et al. 2021

High Voltage

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In order to achieve rapid and simple non-destructive testing of water trees in materials, a novel water tree characterisation method based on the complementary split ring resonators (CSRR) was proposed. The characteristics of circular CSRR and rectangular CSRR were analysed in high-frequency electromagnetic simulation software. The resonant frequency of CSRR was found to be correlated to the dielectric constant of the materials. In addition, the lumped equivalent circuit parameters of CSRRs were also calculated and simulated. The results of electromagnetic simulations and circuit simulations achieved good consistency. In the experimental part, sensors based on the two kinds of CSRRs were fabricated and were used to detect the water tree defects in low-density polyethylene samples. The experiment results showed that the method of using CSRR sensors to detect water tree is feasible.

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Relaxation properties of glass and graphite loaded PTFE composites

Motyl

Lowkis

2002

Journal of Non-Crystalline Solids

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Transient current measurement for the detection of water tree growth in polymeric power cables

Cited by 13 publications

References 14 publications

Effect of water absorption on pristine and ion-irradiated kapton-H polyimide using thermally stimulated depolarization current technique

Effect of water absorption on pristine and ion-irradiated kapton-H polyimide using thermally stimulated depolarization current technique

A novel characterization method for water trees based on the transmission characteristics of complementary split ring resonators

Relaxation properties of glass and graphite loaded PTFE composites

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