Transfer function characterization for HFCTs used in partial discharge detection

Xiao Hu, W. H. Siew, Martin D. Judd, Xiaosheng Peng

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

High frequency current transformers (HFCTs) are widely employed to detect partial discharge (PD) induced currents in high voltage equipment. This paper describes measurements of the wideband transfer functions of HFCTs so that their influence on the detected pulse shape in advanced PD measurement applications can be characterized. The time-domain method based on the pulse response is a useful way to represent HFCT transfer functions as it allows numerical determination of the forward and reverse transfer functions of the sensor. However, while the method is accurate at high frequencies it can have limited resolution at low frequencies. In this paper, a composite time-domain method is presented to allow accurate characterization of the HFCT transfer functions at both low and high frequencies. The composite method was tested on two different HFCTs and the results indicate that the method can characterize their transfer functions ranging from several kHz to tens of MHz. Results are found to be in good agreement with frequency-domain measurements up to 50 MHz. Measurement procedures for using the method are summarized to facilitate further applications.
LanguageEnglish
Pages1088-1096
Number of pages9
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Volume24
Issue number2
DOIs
Publication statusPublished - 24 Apr 2017

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Electric instrument transformers
Partial discharges
Transfer functions
Induced currents
Composite materials
Sensors
Electric potential

Keywords

  • HF transformers
  • current transformers
  • transfer functions
  • time domain measurements
  • partial discharges

Cite this

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title = "Transfer function characterization for HFCTs used in partial discharge detection",
abstract = "High frequency current transformers (HFCTs) are widely employed to detect partial discharge (PD) induced currents in high voltage equipment. This paper describes measurements of the wideband transfer functions of HFCTs so that their influence on the detected pulse shape in advanced PD measurement applications can be characterized. The time-domain method based on the pulse response is a useful way to represent HFCT transfer functions as it allows numerical determination of the forward and reverse transfer functions of the sensor. However, while the method is accurate at high frequencies it can have limited resolution at low frequencies. In this paper, a composite time-domain method is presented to allow accurate characterization of the HFCT transfer functions at both low and high frequencies. The composite method was tested on two different HFCTs and the results indicate that the method can characterize their transfer functions ranging from several kHz to tens of MHz. Results are found to be in good agreement with frequency-domain measurements up to 50 MHz. Measurement procedures for using the method are summarized to facilitate further applications.",
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Transfer function characterization for HFCTs used in partial discharge detection. / Hu, Xiao; Siew, W. H.; Judd, Martin D.; Peng, Xiaosheng.

In: IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 24, No. 2, 24.04.2017, p. 1088-1096.

Research output: Contribution to journalArticle

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N1 - (c) 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, 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 components of this work in other works.

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