On-line partial discharge calibration and monitoring for power transformers

Farag, A.S.; Shewhdi, M.H.; Jin, Xisen; Wang, C; Cheng, T.C.; Xiang, Dong; Gao, Sitian; Jing, Wang; Wang, Z

doi:10.1016/s0378-7796(98)00157-6

Cited by 31 publications

(17 citation statements)

References 3 publications

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“…Based on literature reports [1][2][3][4][5][6][7][8][9][10][11] it can be concluded that at an adequate regime of metrology, the optical spectrophotometry method not only enables for accurate detection of radiation generated by electrical discharges, but also for widely understood analysis.…”

Section: Introductionmentioning

confidence: 99%

“…However, measurements results reported in the literature confirm the high sensitivity of this method, revealing by changes of model parameters and tests conditions. Thus it becomes possible to study a number of phenomena inaccessible by application of conventional diagnostics for insulation systems of electric power devices such as the electric, gas chromatography and the acoustic emission methods [1][2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Influence Estimation of the Voltage Value on the Measurement Results for the Optical Radiation Generated by Partial Discharges on Bushing Isolator

Frącz

2011

Acta Phys. Pol. A

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The subject area of the paper concerns determination of possibility and application scope suggestion for the optical spectrophotometry method in the linear isolators diagnosis. Measurements results of the optical radiation emitted by partial discharges generated on a model of bushing isolator, which was placed in the air, are presented in the paper. Recording was done by use of a spectrophotometer that enabled for measurement of optical radiation in the range from 250 to 1700 nm. The main aim of laboratory research works performed was to estimate the influence of the supply voltage value changes in range from 0 to 60 kV on the intensity and character of the optical radiation spectrum emitted by surface partial discharges occurring on the ceramic insulating surface of the bushing isolator. In the scope of research works, analysis of voltage value changes influence on the gathered spectra was performed while its accretion and decrease was investigated. Furthermore, the measurements and analysis performed enclose the influence estimation of the time, when the voltage was attached to the high voltage electrode, on the proceeding of the optical phenomena connected with generation of surface partial discharges. In addition a comparative analysis of measurements results gathered for two designed and implemented models of bushing insulators, which differ in geometric dimensions, was performed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence Estimation of the Voltage Value on the Measurement Results for the Optical Radiation Generated by Partial Discharges on Bushing Isolator

Frącz

2011

Acta Phys. Pol. A

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“…On the basis of unknowns from (14), (15) the matrix (16) was written and its determinant (17) and matrix (18) are determined from Eqs. (14) and (15):…”

Section: Methods Of Solving Equationsmentioning

confidence: 99%

Solving a Set of Spherical Equations for Localization of Partial Discharges by Acoustic Emission Method

et al. 2015

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This article deals with the subject matter of improvement of the acoustic emission methods used for location of partial discharges, which may occur inside power transformer insulation systems. Analytical solutions of spherical equations for location of partial discharge generation using the acoustic method were shown in detail. Presented in the article method of solving the assumed equations is based on the analytical method and matrix notation. Theoretical considerations and later the measurement-based verication refer to the use of the triangulation method for location of the occurrence of partial discharges. The results of the scientic and research works that have been presented in this article are the next stage of research aimed at development of on-line diagnosis system for insulation systems of electrical equipment, allowing for detection, measurement and identication of forms and locations of partial discharges using the acoustic emission method.

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“…Power transformers are one of the most important items in the national electrical system (Błachowicz et al, 2016;Farag et al, 1999;Garcia-Colon et al, 2004;Lin et al, 2005). A properly conducted transformer maintenance is essential to optimize the total power system maintenance costs, and in particular, to ensure the continuity of the electricity supply service to consumers (Lopatkiewicz et al, 2012;Menon et al, 2001;Witos, Gacek, 2008).…”

Section: Introductionmentioning

confidence: 99%

Application of the Acoustic Emission Method for Diagnosis of On-Load Tap Changer

Majchrzak¹,

Cichoń²,

Borucki³

2017

Archives of Acoustics

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This paper provides an example of the application of the acoustic emission (AE) method for the diagnosis of technical conditions of a three-phase on-load tap-changer (OLTC) G III type. The measurements were performed for an amount of 10 items of OLTCs, installed in power transformers with a capacity of 250 MVA. The study was conducted in two different OLTC operating conditions during the tapping process: under load and free running conditions. The analysis of the measurement results was made in both time domain and time-frequency domain. The description of the AE signals generated by the OLTC in the time domain was performed using the analysis of waveforms and determined characteristic times. Within the time-frequency domain the measured signals were described by short-time Fourier transform spectrograms.

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On-line partial discharge calibration and monitoring for power transformers

Cited by 31 publications

References 3 publications

Influence Estimation of the Voltage Value on the Measurement Results for the Optical Radiation Generated by Partial Discharges on Bushing Isolator

Influence Estimation of the Voltage Value on the Measurement Results for the Optical Radiation Generated by Partial Discharges on Bushing Isolator

Solving a Set of Spherical Equations for Localization of Partial Discharges by Acoustic Emission Method

Application of the Acoustic Emission Method for Diagnosis of On-Load Tap Changer

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