New statistical methods for evaluation of DGA data

Mosiński, Franciszek .; Piotrowski, T.

doi:10.1109/tdei.2003.1194108

Cited by 26 publications

(13 citation statements)

References 2 publications

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“…The calculations were performed using MOSTAT software where the maximum likelihood method was applied. This software is the authors' tool, which was created at the High Voltage Division of the Institute of Electrical Power Engineering of Lodz University of Technology, Poland, and has been tested from many years, solving both scientific and industry problems [17,24,[29][30][31]. The results of this estimation for the considered gap distance of 10 mm are quoted in Table 2.…”

Section: Measurement Assumptionsmentioning

confidence: 99%

Streamer Propagation and Breakdown in a Very Small Point-Insulating Plate Gap in Mineral Oil and Ester Liquids at Positive Lightning Impulse Voltage

Rózga

2016

Energies

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This article presents the results of comparative studies on streamer propagation and breakdown in a point-insulating plate electrode system in mineral oil and two ester liquids. The studies were performed for a 10-mm gap and a positive standard lightning impulse. The work was focused on the comparison of light waveforms registered using the photomultiplier technique. The results indicated that both esters demonstrate a lower resistance against the appearance of fast energetic streamers than mineral oil. The reason for such a conclusion is that the number of lightning impulses supplied to the electrode system for which the above-mentioned fast streamers appeared at a given voltage level was always higher in the case of ester liquids than mineral oil. In terms of breakdown, the esters tested were assessed as more susceptible to the appearance of breakdown in the investigated electrode system. The number of breakdowns recorded in the case of esters was always greater than the corresponding number of breakdowns in mineral oil. This may be supposed on the basis of the obtained results that imply that, in both synthetic and natural ester, the formed breakdown channel, which bridged the gap through the surface of pressboard plate, is characterized by higher energy than in the case of mineral oil.

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Section: Measurement Assumptionsmentioning

confidence: 99%

Streamer Propagation and Breakdown in a Very Small Point-Insulating Plate Gap in Mineral Oil and Ester Liquids at Positive Lightning Impulse Voltage

Rózga

2016

Energies

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“…However, the degradation process may take a long period of time [11]. The start of the accelerated degradation process is IF condition and end of life of a power transformer is reached when it is in MF condition.…”

Section: Threshold Belief Mass Interpretation Rulementioning

confidence: 99%

Decision making framework for power transformer Dissolved Gas Analysis on the basis of Dempster-Shafer theoretic approach

Radzian

Itoh

2010

2010 Prognostics and System Health Management Conference

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Dissolved Gas Analysis (DGA) is usually performed for power transformer condition based maintenance (CBM) activities. In reality, the interpretation of DGA data is complex and done through several knowledge sources. Lack of information within these knowledge sources necessitates an information fusion methodology. Constructed upon DempsterShafer (DS) theoretic approach, this paper proposes a novel interpretation rule and algorithm. Weibull functions were utilized to quantify the degree of belief in major fault according to respective DGA parameters. Threshold belief mass (THB) that distinguishes incipient fault from major fault, which is located within the interval of degree of belief in major fault were observed. In this paper, based on minimum threshold values, a novel rule termed as Threshold Belief Mass (THB) interpretation rule is proposed and compared with Dempster's and Yager's combination rule. Furthermore, from the result of THB interpretation rule and belief or plausibility function, different level of transformer's condition is suggested. Several operational and maintenance decision-making proposal are introduced for a system operator with respect to the belief and plausibility function. In summary, the new method enables a system operator to interpret DGA data more systematically.

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“…In [11], an index has been stated for detecting the occurrence of inter-turn faults and TSCFs as well. In [12], a harmonic analysis has been used to detect incipient TSCFs; in this method, a fault has been detected based on variations in the content of current harmonics during the occurrence of TSCFs. In [7], the current has been decomposed into three components -positive, negative, and zero sequences -to detect TSCFs using the differential method for either negative or zero sequences.…”

Section: Introductionmentioning

confidence: 99%

Determination and localisation of turn‐to‐turn fault in transformer winding using frequency response analysis

Ahour¹,

Seyedtabaii²,

Gharehpetian

2018

IET Science, Measurement & Technology

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New statistical methods for evaluation of DGA data

Cited by 26 publications

References 2 publications

Streamer Propagation and Breakdown in a Very Small Point-Insulating Plate Gap in Mineral Oil and Ester Liquids at Positive Lightning Impulse Voltage

Streamer Propagation and Breakdown in a Very Small Point-Insulating Plate Gap in Mineral Oil and Ester Liquids at Positive Lightning Impulse Voltage

Decision making framework for power transformer Dissolved Gas Analysis on the basis of Dempster-Shafer theoretic approach

Determination and localisation of turn‐to‐turn fault in transformer winding using frequency response analysis

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