Ageing indices and energy delivery for polymers undergoing PD activity under combined AC and DC stress

Weijia Zhao, Wah Hoon Siew, Martin J Given, Qingmin Li, Jinliang He

Research output: Contribution to journalArticle

Abstract

Samples of polypropylene and high density polyethylene have been exposed to partial discharge activity at elevated temperatures under the influence of combined AC and DC stresses in the range of 1 and 2.5 kHz. Based on FTIR-ATR and dielectric spectroscopy data values for the carbonyl index (CI), the low frequency conductivity (0) and a proposed new index the susceptibility index (I) have been calculated to characterize the degree of ageing in the samples. The susceptibility index reflects changes in the number of dipoles and the distribution of dipole moments in the system as a result of ageing. The rate of energy delivery from the partial discharge activity has also been calculated and has been found to be dependent on the frequency of the AC component of the stress. Strong correlations are observed between the behavior of the individual indices and the rate of energy delivery. Possible reasons for these observed correlations are discussed and the observed differences in the behavior of the ageing under different experimental conditions are considered.
LanguageEnglish
Article number8211
Number of pages8
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Publication statusAccepted/In press - 21 Aug 2019

Fingerprint

Aging of materials
Partial discharges
Polymers
Dielectric spectroscopy
Dipole moment
High density polyethylenes
Polypropylenes
Temperature

Keywords

  • Partial discharge (PD)
  • electrothermal aging
  • combined AC and DC aging
  • aging indices
  • High Density Polyethylene

Cite this

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title = "Ageing indices and energy delivery for polymers undergoing PD activity under combined AC and DC stress",
abstract = "Samples of polypropylene and high density polyethylene have been exposed to partial discharge activity at elevated temperatures under the influence of combined AC and DC stresses in the range of 1 and 2.5 kHz. Based on FTIR-ATR and dielectric spectroscopy data values for the carbonyl index (CI), the low frequency conductivity (0) and a proposed new index the susceptibility index (I) have been calculated to characterize the degree of ageing in the samples. The susceptibility index reflects changes in the number of dipoles and the distribution of dipole moments in the system as a result of ageing. The rate of energy delivery from the partial discharge activity has also been calculated and has been found to be dependent on the frequency of the AC component of the stress. Strong correlations are observed between the behavior of the individual indices and the rate of energy delivery. Possible reasons for these observed correlations are discussed and the observed differences in the behavior of the ageing under different experimental conditions are considered.",
keywords = "Partial discharge (PD), electrothermal aging, combined AC and DC aging, aging indices, High Density Polyethylene",
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note = "{\circledC} 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.",
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journal = "IEEE Transactions on Dielectrics and Electrical Insulation",
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T1 - Ageing indices and energy delivery for polymers undergoing PD activity under combined AC and DC stress

AU - Zhao, Weijia

AU - Siew, Wah Hoon

AU - Given, Martin J

AU - Li, Qingmin

AU - He, Jinliang

N1 - © 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

PY - 2019/8/21

Y1 - 2019/8/21

N2 - Samples of polypropylene and high density polyethylene have been exposed to partial discharge activity at elevated temperatures under the influence of combined AC and DC stresses in the range of 1 and 2.5 kHz. Based on FTIR-ATR and dielectric spectroscopy data values for the carbonyl index (CI), the low frequency conductivity (0) and a proposed new index the susceptibility index (I) have been calculated to characterize the degree of ageing in the samples. The susceptibility index reflects changes in the number of dipoles and the distribution of dipole moments in the system as a result of ageing. The rate of energy delivery from the partial discharge activity has also been calculated and has been found to be dependent on the frequency of the AC component of the stress. Strong correlations are observed between the behavior of the individual indices and the rate of energy delivery. Possible reasons for these observed correlations are discussed and the observed differences in the behavior of the ageing under different experimental conditions are considered.

AB - Samples of polypropylene and high density polyethylene have been exposed to partial discharge activity at elevated temperatures under the influence of combined AC and DC stresses in the range of 1 and 2.5 kHz. Based on FTIR-ATR and dielectric spectroscopy data values for the carbonyl index (CI), the low frequency conductivity (0) and a proposed new index the susceptibility index (I) have been calculated to characterize the degree of ageing in the samples. The susceptibility index reflects changes in the number of dipoles and the distribution of dipole moments in the system as a result of ageing. The rate of energy delivery from the partial discharge activity has also been calculated and has been found to be dependent on the frequency of the AC component of the stress. Strong correlations are observed between the behavior of the individual indices and the rate of energy delivery. Possible reasons for these observed correlations are discussed and the observed differences in the behavior of the ageing under different experimental conditions are considered.

KW - Partial discharge (PD)

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KW - aging indices

KW - High Density Polyethylene

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JO - IEEE Transactions on Dielectrics and Electrical Insulation

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