Transfer and evaluation of the AC PRPD representation for internal PD at DC voltage

Dezenzo, Tobias; Betz, Thomas; Schwarzbacher, Andreas

doi:10.1109/icd.2016.7547658

Cited by 3 publications

(6 citation statements)

References 8 publications

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“…It has to be noted that this pattern is rather similar to a pattern for internal PD observed during a study [7] on PRPD for negative dc voltages containing a ripple. No data for a positive voltage has been published so far but a concentration of discharges in the vicinity of the maximum of the applied voltage is likely.…”

Section: Resultssupporting

confidence: 80%

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The different stages of PRPD pattern for positive point to plane corona driven by a DC voltage containing ripple

Dezenzo

Betz

Schwarzbacher³

2018

IEEE Trans. Dielect. Electr. Insul.

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The different phase resolved partial discharge patterns, which can be recognized when a positive dc voltage containing a ripple due to a half-wave rectification is used are presented in this paper. Results are given from corona onset to the appearance of breakdown streamers. The outcomes are five different patterns, which represent the four stages of positive corona and their transition zones. Three of them are clearly identifiable with respect to patterns from other discharge sources that have already been reported for dc voltages containing a ripple. For an assessment of pattern formation discharge pulses as recorded at the test object are presented. Finally, the appearance of patterns is explained with support of the measured discharge pulses and the underlying physical processes.

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Section: Resultssupporting

confidence: 80%

“…The repeating sequence is required to synchronize the PD detection and results have already been reported for different types of discharge sources [6][7][8]. In this paper the method is applied to a point to plane arrangement being driven by a positive dc voltage.…”

Section: Introductionmentioning

confidence: 99%

The different stages of PRPD pattern for positive point to plane corona driven by a DC voltage containing ripple

Dezenzo

Betz

Schwarzbacher³

2018

IEEE Trans. Dielect. Electr. Insul.

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“…Thus, PDs in different failure routines can be related to phaseresolved partial discharge (PRPD) patterns [4]. This method can also be used in DC PD diagnostics by superimposing a small ripple on the DC stress [15]. Thus, the methodological knowledge can be transferred, supporting the introduction of DC PD diagnostics using PRPDs.…”

Section: Technical Backgroundmentioning

confidence: 99%

Computer Vision for DC Partial Discharge Diagnostics in Traction Battery Systems

Sangouard,

Freudenberg,

Kertel

2023

WEVJ

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The tendency towards thin insulation layers in traction battery systems presents new challenges regarding insulation quality and service life. Phase-resolved DC partial discharge diagnostics can help to identify defects. Furthermore, different root causes are characterized by different patterns. However, to industrialize the procedure, there is the need for an automatic pattern recognition system. This paper shows how methods from computer vision can be applied to DC partial discharge diagnostics. The derived system is self-learning, needs no tedious manual calibration, and can identify defects within a matter of seconds. Thus, the combination of computer vision and phase-resolved DC partial discharge diagnostics provides an industrializable system for detecting insulation faults and identifying their root causes.

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“…On the other hand, the occurrence of PD inside the cavity causes the accumulation of charges on the cavity walls. As a result, the voltage inside the cavity drops to the residual voltage (V r ) [55][56]. The time interval between successive PD pulses is given by equation ( 1) [38,56].…”

Section: Experiemtal Setupmentioning

confidence: 99%

“…As a result, the voltage inside the cavity drops to the residual voltage (V r ) [55][56]. The time interval between successive PD pulses is given by equation ( 1) [38,56]. Due to the fast recharging process inside the cavity after PD inception, V r value is high.…”

Section: Experiemtal Setupmentioning

confidence: 99%

Studying the Aging Evolution of Oil-Paper Insulation Comprising of a Gas Cavity Under the Stress of AC and DC Voltage Depending on Partial Discharge and Dissolved Gases Measurements

2020

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The oil-paper insulation system is widely used for the insulation purposes of power transformers as a result of its ability to withstand high thermal and electrical stresses. The presence of a gas cavity between impregnated papers layer is a serious problem. When localized breakdown takes place within this cavity, partial discharge (PD) occurs and ages the rest of the insulation system. This aging phenomenon declines the expected life time of the insulation system and subsequently the life time of the power transformers. Dissolved gas analysis is a recommended technique that is used in order to assess the state of the insulation system inside the transformers. In this paper, PD is recorded in the case of gas cavity presence between the layers of the impregnated papers under the effect of AC and DC voltage stress. This record is extended from the instance of PD inception until the breakdown of the whole insulation system. Furthermore, the concentration of the gases that dissolve in the insulating oil due to the aging of the impregnated paper is measured eight times during the record of the PD. Finally, the degradation of the insulating papers is studied optically through the use of a microscope at different stages of the aging test. Depending on PD measurements, dissolved gas analysis (DGA) results, and the optical study of the paper aging, the evolution of the aging of oil-paper insulation system as a result of internal PD is declared when AC and DC voltage stresses are applied. It is obtained that the aging evolutionary process totally differs with the alteration of the applied voltage.INDEX TERMS Partial discharge, internal cavity, oil-paper, dissolved gas analysis, insulation aging.

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Transfer and evaluation of the AC PRPD representation for internal PD at DC voltage

Cited by 3 publications

References 8 publications

The different stages of PRPD pattern for positive point to plane corona driven by a DC voltage containing ripple

The different stages of PRPD pattern for positive point to plane corona driven by a DC voltage containing ripple

Computer Vision for DC Partial Discharge Diagnostics in Traction Battery Systems

Studying the Aging Evolution of Oil-Paper Insulation Comprising of a Gas Cavity Under the Stress of AC and DC Voltage Depending on Partial Discharge and Dissolved Gases Measurements

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