Statistics based method for partial discharge identification in oil paper insulation systems

Kunicki, Michał; Cichoń, A.; Nagi, Łukasz

doi:10.1016/j.epsr.2018.01.007

Cited by 31 publications

(19 citation statements)

References 53 publications

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“…Figures 4b and 5 show the average and maximum amplitude of UHF signals. Both characteristic values are used as good descriptors to describe the PD phenomenon [21]. Both the mean and maximum UHF amplitude values for Teflon increased with the voltage generating partial discharges.…”

Section: Measurements In the Insulating Oilmentioning

confidence: 99%

Radiation in the Optical and UHF Range Emitted by Partial Discharges

et al. 2019

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This paper presents the results of analysis of a solid dielectric’s influence on the phenomena associated with the signals emitted by surface partial discharges. Three types of electrode systems were tested, in which solid dielectrics made of pressboard, Teflon, and glass were used. The emission of such signals as radio waves in the Ultra high frequency (UHF) range and optical radiation was analyzed. The measurements were carried out in the insulation systems most commonly used in electrical power equipment, i.e., mineral oil and air. UHF and optical spectrophotometry methods were used to register the emitted signals. The obtained results indicate that the type of material from which the dielectric solid is made may have a potential impact on some ranges of emitted electromagnetic waves during the surface electrical discharges. The research topic undertaken is important in issues associated with high-voltage insulation systems and in particular with surface discharges, which are often the cause of their damage.

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Section: Measurements In the Insulating Oilmentioning

confidence: 99%

Radiation in the Optical and UHF Range Emitted by Partial Discharges

et al. 2019

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“…As PD releases various types of energy such as heat, acoustic sound, light, electrical current, electromagnetic waves and chemical byproducts, PD can be detected and monitored through the changes in these energies. The PD detection methods used are acoustic detection method based on sound waves, thermovision method based on heat emission, spectrophotometry method based on light emission, DGA method based on chemical reaction changes, electrical method, TEV and UHF methods based on electromagnetic and radiofrequency radiation [9].…”

Section: Introductionmentioning

confidence: 99%

Fiber Optic Acoustic Sensor Based on SMS Structure With Thin Polymer Diaphragm for Partial Discharge Detection

et al. 2020

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This paper proposes a fiber optic acoustic sensor (FOAS) based on a single-mode fibermultimode fiber-single-mode fiber (SMS) structure attached to a thin polymer film used as a diaphragm. The diaphragm was specially developed to enhance the sensitivity towards the acoustic pressure-wave resulted from the partial discharge (PD) events. The sensitivity and signal-to-noise ratio (SNR) characterizations of the FOAS without and with a thin polymer film were performed. Both time-resolved and phase-resolved partial discharge (PRPD) patterns measurements were carried out in air and oil media. The experiment was conducted with three-electrodes using FOAS in conjunction with the conventional PD measurement as per IEC 60270 standard. The sensor achieved a sensitivity up to-31.21 dBm and-30.8 (0 dBm is defined as 1V/µBar) using broadband and tunable light source, respectively. The discharge characteristics pattern of FOAS was verified with IEC 60270 standard, and the patterns of FOAS resembled IEC 60270 standard. The proposed FOAS was capable for detecting the PD using both broadband and tunable laser lights. The use of the thin polymer film had a significant impact on the acoustic sensitivity. With the simple, low-cost design structure and free from electromagnetic interference, FOAS is found to be suitable as an in-situ sensor for detecting the acoustic signals of partial discharge and can be utilized inside the transformer.

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“…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. Main application areas of the UHF method for PD analysis in electric power apparatus are detection [15,16,17] and localization of the source [18,19]. It also should be mentioned that several works have been done on a sensitivity check process for the UHF method, so far [20,21].…”

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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Statistics based method for partial discharge identification in oil paper insulation systems

Cited by 31 publications

References 53 publications

Radiation in the Optical and UHF Range Emitted by Partial Discharges

Radiation in the Optical and UHF Range Emitted by Partial Discharges

Fiber Optic Acoustic Sensor Based on SMS Structure With Thin Polymer Diaphragm for Partial Discharge Detection

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

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