PD pulse burst characteristics in differently aged transformer oils under AC conditions

J. H. Li, Y. M. Li, G. L. Wang, M. D. Judd

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Partial discharge (PD) detection is a technique widely used for high voltage equipment insulation condition assessment. In such applications, an understanding of PD mechanisms, characteristics and development processes is important. In this paper, PD characteristics of three typical transformer oils, aged to different degrees, are examined under AC conditions, using a needle-to-plane electrode system. The PD activity in transformer oil is confirmed as appearing in pulse burst form. Pulse burst characteristics recorded in the study show that the transferred electric charge per PD pulse burst increases with the degree of aging. This increase is accompanied by an increase in the number of discrete PD pulses and by a decrease in cavity formation time. The experimental results of cavity discharge in differently aged transformer oils are discussed and their characteristics are explained in terms of the charge exchange mechanism.
LanguageEnglish
Pages236-240
Number of pages5
JournalPrzeglad Elektrotechniczny
Volume87
Issue number6
Publication statusPublished - 2011

Fingerprint

Insulating oil
Partial discharges
Electric charge
Needles
Insulation
Aging of materials
Electrodes
Electric potential

Keywords

  • power transformer
  • sequence
  • field
  • liquid dielectrics
  • vapor bubbles
  • fluids
  • oil insulation
  • electrical breakdown
  • pd pulse burst
  • pre-breakdown
  • partial discharges
  • bulse burst characteristics
  • transformer oils
  • ac conditions

Cite this

Li, J. H., Li, Y. M., Wang, G. L., & Judd, M. D. (2011). PD pulse burst characteristics in differently aged transformer oils under AC conditions. Przeglad Elektrotechniczny, 87(6), 236-240.
Li, J. H. ; Li, Y. M. ; Wang, G. L. ; Judd, M. D. / PD pulse burst characteristics in differently aged transformer oils under AC conditions. In: Przeglad Elektrotechniczny. 2011 ; Vol. 87, No. 6. pp. 236-240.
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PD pulse burst characteristics in differently aged transformer oils under AC conditions. / Li, J. H.; Li, Y. M.; Wang, G. L.; Judd, M. D.

In: Przeglad Elektrotechniczny, Vol. 87, No. 6, 2011, p. 236-240.

Research output: Contribution to journalArticle

TY - JOUR

T1 - PD pulse burst characteristics in differently aged transformer oils under AC conditions

AU - Li, J. H.

AU - Li, Y. M.

AU - Wang, G. L.

AU - Judd, M. D.

PY - 2011

Y1 - 2011

N2 - Partial discharge (PD) detection is a technique widely used for high voltage equipment insulation condition assessment. In such applications, an understanding of PD mechanisms, characteristics and development processes is important. In this paper, PD characteristics of three typical transformer oils, aged to different degrees, are examined under AC conditions, using a needle-to-plane electrode system. The PD activity in transformer oil is confirmed as appearing in pulse burst form. Pulse burst characteristics recorded in the study show that the transferred electric charge per PD pulse burst increases with the degree of aging. This increase is accompanied by an increase in the number of discrete PD pulses and by a decrease in cavity formation time. The experimental results of cavity discharge in differently aged transformer oils are discussed and their characteristics are explained in terms of the charge exchange mechanism.

AB - Partial discharge (PD) detection is a technique widely used for high voltage equipment insulation condition assessment. In such applications, an understanding of PD mechanisms, characteristics and development processes is important. In this paper, PD characteristics of three typical transformer oils, aged to different degrees, are examined under AC conditions, using a needle-to-plane electrode system. The PD activity in transformer oil is confirmed as appearing in pulse burst form. Pulse burst characteristics recorded in the study show that the transferred electric charge per PD pulse burst increases with the degree of aging. This increase is accompanied by an increase in the number of discrete PD pulses and by a decrease in cavity formation time. The experimental results of cavity discharge in differently aged transformer oils are discussed and their characteristics are explained in terms of the charge exchange mechanism.

KW - power transformer

KW - sequence

KW - field

KW - liquid dielectrics

KW - vapor bubbles

KW - fluids

KW - oil insulation

KW - electrical breakdown

KW - pd pulse burst

KW - pre-breakdown

KW - partial discharges

KW - bulse burst characteristics

KW - transformer oils

KW - ac conditions

M3 - Article

VL - 87

SP - 236

EP - 240

JO - Przeglad Elektrotechniczny

T2 - Przeglad Elektrotechniczny

JF - Przeglad Elektrotechniczny

SN - 0033-2097

IS - 6

ER -