Analysis of Properties of Chosen Acoustic Emission Descriptors Describing Acoustic Signals Measured by Means of Acoustic Emission Method within Oil Transformers

Witos, F.; Olszewska, A.

doi:10.12693/aphyspola.118.1267

Cited by 12 publications

(11 citation statements)

References 10 publications

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“…The bushing isolator (bushing) is a structural system allowing for carriage through walls, or partitions, or in distribution stations through tanks and through grounded transformer covers, capacitors, generators, shunt transformers or switches, of one or a few wires and for isolating them from this partition, wherein the mounting (a collar or a clamper) to the barrier is part of the bushing [5,[12][13][14][15][16][17].…”

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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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%

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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“…Among other methods in the PD diagnosis the acoustic emission method, which is based on measurement and analysis of signals registered by use of acoustic emission (AE) sensors, is frequently applied [1,2]. Thus propagation phenomena of acoustic waves generated by PDs are currently widely studied [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Mathematical Model and Numerical Analysis of AE Wave Generated by Partial Discharges

2011

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Paper presents definition of a mathematical model describing acoustic emission signals generated by partial discharges occurring in oil immersed electric power transformers. Time runs, power spectral density graphs and spectrograms of acoustic emission signals generated in experiments, performed under laboratory conditions, and of equivalent signals, calculated on the basis of the mathematical model, are presented. Furthermore, results of numerical simulations of acoustic pressure distribution inside a tank filled with insulation oil are presented in the paper. In the center of the tank acoustic emission wave sources were placed, each generating signals described by the model developed.

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“…A correct and systematic diagnosis of appliances of a strategic significance is one of the most important procedures leading to the lowering of failure indexes. Undoubtedly, power transformers belong to the group of such appliances and their shut down due to failure may cause a significant economic loss [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Time-Frequency Analysis of Mechanical Vibrations of the Dry Type Power Transformer Core

Borucki

2011

Acta Phys. Pol. A

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The paper presents research results referring to the development of a non-invasive method of assessment of the power transformer core technical condition based on the analysis of the mechanical vibrations registered. It characterizes the power object under study, the measuring system used and the developed methodology of assessment of the core pressing degree using the vibroacoustic method. The original results of the time-frequency analysis of the vibroacoustic signals presented in the paper were obtained during switching on a real 800 kVA dry type power transformer in laboratory conditions. The analysis of the signals registered was carried out for three states of its operation: the core pressed by the manufacturer, the core with loose screws fixing the upper yoke and the core with separated upper yoke beams.

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Analysis of Properties of Chosen Acoustic Emission Descriptors Describing Acoustic Signals Measured by Means of Acoustic Emission Method within Oil Transformers

Cited by 12 publications

References 10 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

Mathematical Model and Numerical Analysis of AE Wave Generated by Partial Discharges

Time-Frequency Analysis of Mechanical Vibrations of the Dry Type Power Transformer Core

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