Application of statistical interpretation technique for frequency response analysis and detection of axial displacement in transformer winding

Sardar, Suman; Kumar, Amrendra; Chatterjee, Biswendu; Dalai, Sovan

doi:10.1109/calcon.2017.8280776

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…End-to-end open circuit and short circuit tests are recommended by IEEE Std C57.149-2012 [21] for FRA measurement of the transformer winding. A few studies have analyzed that looseness or breaking of the clamping structure can lead to mechanical changes in the windings [22][23][24][25]. The effects due to clamping faults are simulated based on lumped circuit model and the shunt conductance is varied for both end-to-end open circuit and short-circuit tests in order to analyze the degree of clamping faults [26].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effect of Winding Clamping Structure on Frequency Response Signature of 11 kV Distribution Transformer

et al. 2018

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This paper presents an investigation on the sensitivity of frequency response of a 500 kVA, 11/0.433 kV distribution transformer with and without the presence of a winding clamping structure. Frequency response analysis (FRA) measurements of multiple test configurations were carried out with and without the presence of a winding clamping structure. Statistical analyses based on Pearson’s correlation coefficient (PCC), Spearman’s correlation coefficient (SCC), Kendall’s correlation coefficient (KCC), cross-correlation coefficient (CCF), root mean square error (RMSE), absolute sum of logarithmic error (ASLE), hypothesis test (F-test) and relative factor (RF) were applied to determine the effect of the winding clamping structure. It was found that the removal of the winding clamping structure has an impact on the frequency response signature at the frequency less than 2 kHz during offline measurement. It was found that ASLE and F-test are suitable methods that can be used to indicate the variation of frequency response caused by clamping structure removal of the distribution transformer under study.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Effect of Winding Clamping Structure on Frequency Response Signature of 11 kV Distribution Transformer

et al. 2018

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Detection of probability of occurrence, type and severity of faults in transformer using frequency response analysis based numerical indices

2021

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Insulation system diagnosis in power transformers using DGA analysis and Megger DC

Juris Zapata,

Durán Tovar,

Tello Maita

et al. 2024

Ing. Inv.

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Dissolved gas chromatography (DGA) analysis and Megger DC insulation tests are performed to diagnose the condition of a power transformer. In this context, the objective of this study is to assess whether there is a relationship between both types of tests. To this effect, a database with DGA and Megger DC test protocols is analyzed, using the theory of variable correlation as well as current DGA techniques. The results allow stating that there is indeed a relationship between both tests under specific conditions. Therefore, the DC isolation status of a transformer can be estimated via DGA tests.

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Application of statistical interpretation technique for frequency response analysis and detection of axial displacement in transformer winding

Cited by 3 publications

References 7 publications

Investigation of the Effect of Winding Clamping Structure on Frequency Response Signature of 11 kV Distribution Transformer

Investigation of the Effect of Winding Clamping Structure on Frequency Response Signature of 11 kV Distribution Transformer

Detection of probability of occurrence, type and severity of faults in transformer using frequency response analysis based numerical indices

Insulation system diagnosis in power transformers using DGA analysis and Megger DC

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