Partial discharge characteristics of oil-immersed insulation systems under DC, combined AC-DC and DC reversed polarity voltage

Takahashi, Eiki; Tsutsumi, Yukiyasu; Okuyama, K.; Ogata, F.

doi:10.1109/t-pas.1976.32119

Cited by 74 publications

(16 citation statements)

References 2 publications

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“…The electric field in the OIP is co-determined by permittivity of oil and paper at AC voltage while it is co-determined by the conductivity at DC voltage. Therefore, the electric field strength in oil and paper, i.e., EOil and EPaper, can be obtained at pulsating DC voltage, which are as follows [19,26]:…”

Section: Difference In Magnitude Of Breakdown Voltage At Different Vomentioning

confidence: 99%

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Breakdown Voltage and Its Influencing Factors of Thermally Aged Oil-Impregnated Paper at Pulsating DC Voltage

Zhang

Wang

et al. 2017

Energies

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Abstract:Breakdown strength is an important electrical property of insulating paper. Oil-impregnated paper of various aging states was prepared. Its breakdown voltage was then measured at pulsating direct current (DC) voltage with various ripple factors, and alternating current (AC) and DC voltage for comparison, respectively. The AC breakdown voltage is the smallest, and pulsating DC (r = 1/5) breakdown voltage is the greatest before the paper reaches its end of life. A dielectric model was adopted to investigate the difference in magnitude of breakdown voltage at different voltage waveforms. Meanwhile, it was found that breakdown voltage fluctuated and even increased occasionally during the thermal aging process, and a somewhat opposite changing tendency versus aging time was observed for breakdown voltage at DC voltage and pulsating DC voltage with small ripple factors (r = 1/5 and 1/3), compared with AC voltage. The degree of polymerization (DP) and moisture content of the paper were measured, and the characteristics of the pores and cracks of the paper were obtained to investigate the possible influencing factors of breakdown voltage at different aging states. The results showed that the moisture content, oil absorption ability associated with pores and cracks of paper, and the damage to paper structure all contributed to the variation of the breakdown voltage versus aging time, while the importance of their influence differed as the aging state of paper varied.

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Section: Difference In Magnitude Of Breakdown Voltage At Different Vomentioning

confidence: 99%

“…Therefore, the electric field strength in oil and paper, i.e., E Oil and E Paper , can be obtained at pulsating DC voltage, which are as follows [19,26]:…”

Section: Difference In Magnitude Of Breakdown Voltage At Different Vomentioning

confidence: 99%

Breakdown Voltage and Its Influencing Factors of Thermally Aged Oil-Impregnated Paper at Pulsating DC Voltage

Zhang

Wang

et al. 2017

Energies

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“…However the field stress is a different kind of factors which influence the resistivity significantly. In this case the differential equation (5) or (9) is a non-linear one and can be solved by iterative method at every time step.…”

Section: Comparison Of DC Dielectric Testsmentioning

confidence: 99%

A calculation method and some features of transient field under polarity reversal voltage in HVDC insulation

Wen

Zhou

et al. 1993

IEEE Trans. Power Delivery

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A transient electric field takes place in the insulation media with permittivity and resistivity during boundary excitation changing from one steady-state to another, such as a polarity reversal voltage imposing on the insulation of HVDC apparatus. This paper presented a numerical solution and developed a calculation program for such transient field. The method was proved with calculation results of some illustrative examples including a typical bushing barrier system of converter transformers. Some distinguishing features of the transient field were also discussed.

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“…Much research has been concentrated on partial discharge characteristics of oil-paper insulation under AC-DC combined voltages [6][7][8][9][10][11][12][13][14][15]. The PD characteristics of different insulation conditions of pressboard under DC and AC-DC combined voltage are investigated in [10].…”

Section: Introductionmentioning

confidence: 99%

“…The PD characteristics of different insulation conditions of pressboard under DC and AC-DC combined voltage are investigated in [10]. In [11], the effect of space charge on the reliability of oil-paper insulation under HVDC stress is studied by using the PEA method.…”

Section: Introductionmentioning

confidence: 99%

Partial Discharge of Needle-Plane Defect in Oil-Paper Insulation under AC and DC Combined Voltages: Developing Processes and Characteristics

Sun

Zhu

et al. 2017

Energies

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Partial discharge (PD) behaviors of oil-paper insulation is distinctive in AC and DC combined electric fields in converter transformers from PD behaviors in pure AC or DC electric fields. The present study focuses on the PD developing processes and characteristics of oil-paper insulation systems with needle-plane defects under different AC/DC proportions. The degradation of oil-paper insulation can be accelerated by PD pulses incurred by needle-plane defects. AC-DC combined voltages are applied to the needle-plane defect model simultaneously in the established experimental platform, and the proportions of AC/DC voltages are decided according to the cases in actual converter transformers. The developing processes from the initiation of partial discharge until final breakdown were observed for each AC/DC proportion. PD parameters and patterns were acquired by a detector using the pulse current method. The test results indicate that the inception and breakdown voltages increase with the increase of the DC component in AC-DC combined voltages. However, pulse repetition rate and amplitude of PD shows a descending trend when AC/DC proportion decreases. Meanwhile, the PD recurrence rate in the phase between 180 • and 360 • becomes higher than that in the phase between 0 • and 180 • at the initial stage as the DC proportion increases; high-amplitude discharges mainly occur in the phase range between 180 • and 360 • when the pressboard is close to breakdown. The current study is useful in further research on fault diagnosis in converter transformers.

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Partial discharge characteristics of oil-immersed insulation systems under DC, combined AC-DC and DC reversed polarity voltage

Cited by 74 publications

References 2 publications

Breakdown Voltage and Its Influencing Factors of Thermally Aged Oil-Impregnated Paper at Pulsating DC Voltage

Breakdown Voltage and Its Influencing Factors of Thermally Aged Oil-Impregnated Paper at Pulsating DC Voltage

A calculation method and some features of transient field under polarity reversal voltage in HVDC insulation

Partial Discharge of Needle-Plane Defect in Oil-Paper Insulation under AC and DC Combined Voltages: Developing Processes and Characteristics

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