Measurements on partial discharge in on‐site operating power transformer: a case study

Kunicki, Michał; Cichoń, A.; Borucki, S.

doi:10.1049/iet-gtd.2017.1551

Cited by 46 publications

(31 citation statements)

References 29 publications

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“…It should also be understood that, in addition to the technical condition of the transformer, decision about its de-energizing might be forced by the age of the transformer, its service condition, place of installation, and the ability to replace it by a reserve unit. The proper selection of a diagnostic procedure and correct interpretation of the results obtained from different types of measurements are valid, no matter the place of the transformer installation [3][4][5][6][7][8][9][10][11][12][13][14]. In the case of wind and solar farms, appropriate procedures become even more important due to the accumulation of stresses that affect stresses result, among others, from a high variability of loads, frequent de-energizing of transformers, environmental impact (lightning, large daily fluctuations in ambient temperature, and sea climate), and requirements to stay operational during significant voltage dips [15].…”

Section: Introductionmentioning

confidence: 99%

“…Hence, appropriate methods and diagnostic procedures must be chosen, in order to allow the detection of defects occurring solely in these parts of the transformer. The best option seems to be the use of methods that are non-invasive, easy to apply, and give an intuitive view about the initial selection of transformers on healthy units and units with suspected or developed defect [5,10,[16][17][18][19]. Among these methods, one of the most important is the analysis of the gases dissolved in oil (DGA), which constitutes a part of the fundamental measurements within the first level of a diagnostic procedure of a transformer in service [9].…”

Section: Introductionmentioning

confidence: 99%

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Comparative Analysis of the Results of Diagnostic Measurements with an Internal Inspection of Oil-Filled Power Transformers

Piotrowski

Rózga

Kozak³

2019

Energies

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This article presents a description of four independent case studies concerning situations when power transformers were directed to internal inspection. This inspection was the result of a specific case of a routine diagnostic procedure that was carried out and, where the transformer was switched off by a Buchholz gas relay. The case studies described were selected such that they represented situations when availability of historical data on the previous measurements was limited and a quick diagnosis had to be made on the basis of the results from the last measurement. In all of the cases presented here, the analysis of the gases dissolved in oil had played an important role in the detection of the defects that turned out to be dangerous for further exploitation of the transformers considered. The first signal about a possible developing defect was elicited solely from the measurements of the oil samples taken from the transformer in service. However, more detailed recognition and initial localization of the defect was possible after additional supplementary measurements (winding resistance, sweep frequency response analysis, etc.), which required the transformer to be switched off. The conducted sequence of actions, based on the developed diagnostic procedure, indicated the possibility of effective and early withdrawal of the transformer from operation, before it underwent a serious failure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of the Results of Diagnostic Measurements with an Internal Inspection of Oil-Filled Power Transformers

Piotrowski

Rózga

Kozak³

2019

Energies

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“…A significant share of all serious failures around the electrical power distribution system is partially or completely intertwined by PDs [1,2]. The PD occurrence in a liquid insulation system is accompanied by numerous physical phenomena that are fundamentals of the contemporary PD testing systems, i.e., current pulses [3,4], electromagnetic wave emission in the UHF range [5,6], light emission [7,8,9], heat emission [10], chemical reactions [11,12] and acoustic emission [13,14]. Of all the mentioned above methods, UHF is one of the most promising, especially regarding the noise resistivity and relative ease of application, especially in on-site conditions.…”

Section: Introductionmentioning

confidence: 99%

Variability of the UHF Signals Generated by Partial Discharges in Mineral Oil

Kunicki

2019

Sensors

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The paper presents the results of the analysis on the variability of the ultra-high frequency (UHF) signals generated by partial discharges (PD) under the long-term AC voltage. Surface PD (SD) are generated by model PD source (PDS) immersed in brand new mineral oil. Three scenarios are compared and investigated, where different solid dielectrics are applied: pressboard paper (PBP), polytetrafluoroethylene (PTFE) and glass-ceramic (GLS). The PDS is powered continuously by the AC voltage with its relative level of 1.3 of the inception voltage (Ui) within 168 h. UHF signals generated by the continuously occurred SD within 168 h are registered. Various indicators describing the variability of the UHF signals emitted by SD are assigned and analyzed in order to discover if there are any relevant trends presented. Furthermore, some long-term characteristics of the UHF signals emitted by the applied PDS are also announced. As a result, some relevant trends are discovered and related to the properties of the applied dielectric materials, thus the variability of the UHF signals emitted by SD is confirmed. The highest variability of the UHF signals is associated with PBP and the first 48 h after PD inception. Moreover achieved results may be potentially applied for modeling of the PD variability in time, which may be useful for works that concern the development of the UHF method.

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“…As well PD can give information about which insulating material is the best and can be used for equipment, device and system testing [4]. Studies has shown that main cause of failure of power equipment is degradation of insulation due to constant mechanical, electrical and thermal stress in long service life [5].…”

Section: Introductionmentioning

confidence: 99%

Classification of Partial Discharge Detection Technique in High Voltage Power Component: A Review

Rohani

Zaidi

Sakanovic

et al. 2019

IJIE

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In this study, a review on categorization of partial discharge (PD) detection technique is presented. The PD detection is important in order to monitor and diagnosis the insulation health on high voltage (HV) power component. PD at high voltage transformer occurs due to the unscheduled maintenance, aging of equipment, breakdown of insulation, gas bubbles in insulation liquid, manufacturing error and etc. In order to maintain constant and high as possible of the transformer performance, it is essential to control, detect and measure the PD phenomena. There are many methods have been developed based on point of observation; optical, chemical, acoustic and electrical. However, the different methods have their own advantages and disadvantages.

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Measurements on partial discharge in on‐site operating power transformer: a case study

Cited by 46 publications

References 29 publications

Comparative Analysis of the Results of Diagnostic Measurements with an Internal Inspection of Oil-Filled Power Transformers

Comparative Analysis of the Results of Diagnostic Measurements with an Internal Inspection of Oil-Filled Power Transformers

Variability of the UHF Signals Generated by Partial Discharges in Mineral Oil

Classification of Partial Discharge Detection Technique in High Voltage Power Component: A Review

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