UHF characteristics of different types of PD sources in power transformers

Jahangir, Hamid; Akbari, Asghar; Werle, Peter; Akbari, Mohammad; Szczechowski, Janusz

doi:10.1109/iraniancee.2017.7985232

Cited by 14 publications

(8 citation statements)

References 5 publications

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“…However, the working bandwidth of general monopole antennas is narrow; this will lead to information loss. The conical antenna is a monopole antenna which has been commercially used in UHF PD signal detection as shown in Figure 3 b [ 16 , 28 , 51 ]. The Omicron UVS 610 UHF sensor can be equipped through both DN-50 and DN-80 standard oil drain valves.…”

Section: Uhf Sensors In Partial Discharge Detectionmentioning

confidence: 99%

“…Some believe that a wide bandwidth can cause a higher external noise level and distortion with respect to its influence on pattern recognition. In [ 51 ], the measured frequency range was only 70 MHz for UHF pattern recognition but the authors found distinguished features of different discharge patterns can be extracted in such a narrow bandwidth. On the other hand, Sinaga et al [ 41 ] and Lee et al [ 41 , 50 ] argued that narrow bandwidth will lead to loss of information in the frequency domain and be considerably more susceptible to UHF signal distortion.…”

Section: Uhf Sensors In Partial Discharge Detectionmentioning

confidence: 99%

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Application of UHF Sensors in Power System Equipment for Partial Discharge Detection: A Review

Chai

Phung

Mitchell³

2019

Sensors

101

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Condition monitoring of an operating apparatus is essential for lifespan assessment and maintenance planning in a power system. Electrical insulation is a critical aspect to be monitored, since it is susceptible to failure under high electrical stress. To avoid unexpected breakdowns, the level of partial discharge (PD) activity should be continuously monitored because PD occurrence can accelerate the aging process of insulation in high voltage equipment and result in catastrophic failure if the associated defects are not treated at an early stage. For on-site PD detection, the ultra-high frequency (UHF) method was employed in the field and showed its effectiveness as a detection technique. The main advantage of the UHF method is its immunity to external electromagnetic interference with a high signal-to-noise ratio, which is necessary for on-site monitoring. Considering the detection process, sensors play a critical role in capturing signals from PD sources and transmitting them onto the measurement system. In this paper, UHF sensors applied in PD detection were comprehensively reviewed. In particular, for power transformers, the effects of the physical structure on UHF signals and practical applications of UHF sensors including PD localization techniques were discussed. The aim of this review was to present state-of-the-art UHF sensors in PD detection and facilitate future improvements in the UHF method.

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Section: Uhf Sensors In Partial Discharge Detectionmentioning

confidence: 99%

Section: Uhf Sensors In Partial Discharge Detectionmentioning

confidence: 99%

Application of UHF Sensors in Power System Equipment for Partial Discharge Detection: A Review

Chai

Phung

Mitchell³

2019

Sensors

101

View full text Add to dashboard Cite

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“…W publikacjach [21,22] zamieszczono wyniki analizy częstotliwościowej sygnałów radiowych generowanych przez wnz w izolacji papierowo-olejowej. Ponieważ rejestracji impulsów dokonywano przy użyciu anten wąskopasmowych lub wielorezonansowych, dlatego uzyskane wyniki analiz częstotliwościowych wyraźnie różnią się miedzy poszczególnymi publikacjami.…”

Section: Częstotliwość Sygnałów Uhf Generowanych Przez Wnz W Izolacjiunclassified

Konstrukcja anteny UHF typu PIFA do monitoringu wyładowań niezupełnych w transformatorze energetycznym

Szymczak¹

2018

ELECTROTECHNICAL REVIEW

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Streszczenie. W artykule przedstawiono prototypową konstrukcję anteny typu "odwrócone F" (PIFA) przeznaczoną do monitoringu wyładowań niezupełnych (wnz) w transformatorach energetycznych przy użyciu metody UHF. Konstrukcję anteny przystosowano mechanicznie do montażu w oknie dielektrycznym kadzi transformatora, a jej pasmo przenoszenia zostało zoptymalizowane do detekcji wyładowań niezupełnych występujących w izolacji papierowo-olejowej. Przeprowadzone testy laboratoryjne wykazały, że opracowana antena charakteryzuje się około dwukrotnie wyższą skutecznością detekcji wnz w porównaniu do standardowej anteny dyskowej.

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“…Time-resolved PD (TRPD) and phase-resolved PD (PRPD) were used to investigate the PD characteristics in a GIS [ 13 , 14 , 15 ]. The TRPD-based methods analyze the PD pulses while using time-domain, frequency-domain, and both time- and frequency-domain features [ 16 , 17 , 18 ]. The PRPD-based methods analyze the phase-amplitude-number (

- q - n ) of the PRPDs, where

is the phase angle, q is the amplitude, and n is the number of PD occurrences [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

One-Shot Learning for Partial Discharge Diagnosis Using Ultra-High-Frequency Sensor in Gas-Insulated Switchgear

Tuyet-Doan

Tran-Thi

et al. 2020

Sensors

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In recent years, deep learning has been successfully used in order to classify partial discharges (PDs) for assessing the condition of insulation systems in different electrical equipment. However, fault diagnosis using deep learning is still challenging, as it requires a large amount of training data, which is difficult and expensive to obtain in the real world. This paper proposes a novel one-shot learning method for fault diagnosis using a small dataset of phase-resolved PDs (PRPDs) in a gas-insulated switchgear (GIS). The proposed method is based on a Siamese network framework, which employs a distance metric function for predicting sample pairs from the same PRPD class or different PRPD classes. Experimental results over the small PRPD dataset that was obtained from an ultra-high-frequency sensor in the GIS show that the proposed method achieves outstanding performance for PRPD fault diagnosis as compared with the previous methods.

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UHF characteristics of different types of PD sources in power transformers

Cited by 14 publications

References 5 publications

Application of UHF Sensors in Power System Equipment for Partial Discharge Detection: A Review

Application of UHF Sensors in Power System Equipment for Partial Discharge Detection: A Review

Konstrukcja anteny UHF typu PIFA do monitoringu wyładowań niezupełnych w transformatorze energetycznym

One-Shot Learning for Partial Discharge Diagnosis Using Ultra-High-Frequency Sensor in Gas-Insulated Switchgear

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