Identification and localization of PD-sources in power-transformers and power-generators

Fuhr, J.; Aschwanden, T.

doi:10.1109/tdei.2016.005951

Cited by 53 publications

(24 citation statements)

References 2 publications

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“…Dentre os métodos de detecção já apresentados, o método acústico é conhecido por localizar a origem de DPs de forma precisa em cabos isolados a gás Hexafluoreto de enxofre (SF6) ( Bartnikas. 2002) e transformadores (Fuhr and Aschwanden. 2017).…”

Section: Localização Das Descargas Parciaisunclassified

“…O Sistema Phase Resolving Partial Discharge Analyser (PRPDA) de análise, baseia-se na análise estatística da magnitude da suposta descarga como função da posição da fase de uma tensão aplicada por um determinado período de tempo (Fuhr and Aschwanden. 2017).…”

Section: Reconhecimento De Padrõesunclassified

“…Tendo em vista que a maioria das falhas e interrupções de redes de distribuição subterrâneas ocorrem devido a defeitos na isolação dos cabos, e sendo a presença de descargas parciais o maior indicador de defeitos na isolação, o monitoramento e a detecção deste efeito é o foco de diagnósticos de cabos elétricos e outros equipamentos de média e alta tensão, como transformadores e geradores (Fuhr and Aschwanden. 2017).…”

Section: Introductionunclassified

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Diagnóstico e Monitoramento de Cabos Isolados através da Análise de Descargas Parciais: O Estado da Arte

Ribeiro

Paula

2020

Anais Do Congresso Brasileiro De Automática 2020

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Este trabalho apresenta uma ampla e minuciosa revisão bibliográfica sobre a avaliação de descargas parciais para o diagnóstico e monitoramento do estado da isolação de cabos de média e alta tensão. Todos os possíveis métodos de detecção da atividade de descargas parciais, com os respectivos sensores adequados para cada situação, são discutidos de forma a explicitar suas vantagens, limitações e aplicações. É apresentada também uma avaliação dos métodos e parâmetros utilizados no tratamento dos dados de medição e discutido como os mesmos influenciam na distinção entre os sinais associados a descargas parciais e ruídos externos do sistema. Por fim, de forma ilustrar a aplicação das técnicas discutidas, são apresentados relatos de casos encontrados na literatura nos quais foram empregadas metodologias de monitoramento baseadas no controle dos níveis de descargas parciais em cabos isolados e adotadas estratégias de manutenção baseadas nesse princípio.

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Section: Localização Das Descargas Parciaisunclassified

Section: Reconhecimento De Padrõesunclassified

Section: Introductionunclassified

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Diagnóstico e Monitoramento de Cabos Isolados através da Análise de Descargas Parciais: O Estado da Arte

Ribeiro

Paula

2020

Anais Do Congresso Brasileiro De Automática 2020

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“…Newton iteration can be used to solve the approximate solution, and the solution result is the location of the PD source. However, because of various factors such as interference noise, measurement errors, etc., there is either no solution or no unique solution, and the different initial values selected will also affect the solution results .…”

Section: Error Analysis Of Pd Source Z‐coordinate With Plane Layout Umentioning

confidence: 99%

Ladder‐Wise calculation method for z‐coordinate of transformer PD source based on planar layout UHF antenna sensors

Zhang

Cheng

et al. 2019

IEEJ Transactions Elec Engng

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In locating a transformer partial discharge (PD) source, there is a large fluctuation error in the z -coordinate of the location, which results with planar layout ultrahigh-frequency (UHF) antenna sensors. For the large fluctuation error, this paper first theoretically analyzes the reason. According to the theoretical analysis results, a ladder-wise calculation method of the PD source z -coordinate is proposed: first, the x -and y-coordinates of the PD source are calculated, then the univariate equation f (z ) is derived, and the z -coordinate of the PD source is obtained by f (z ). Finally, the positioning effect of the ladder-wise calculation method for PD source z -coordinate is verified experimentally. Experimental results show that the proposed method can reduce the fluctuation of the z -coordinate of the PD source from 0.6 to 0.2, and when the PD location sample set is ≥10, the average absolute error of the z -coordinate is reduced from about 0.4 m to less than 0.1 m.

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“…Typically, this principle uses several AE sensors installed on the transformer wall to detect ultrasound waves generated by the PD and the localization of the PD-source is determined based on the time of flight differences between the acoustic PD signals [10]- [14]. The use of two combined measurement methods is required because the signals from the AE sensors have low signal-tonoise ratio (SNR) due to the damping that the acoustic waves undergo in the propagation paths between the PD-source and the sensors [14], [15]. Therefore, the measurement of the electromagnetic signals in the ultra-high frequency (UHF) range, which has high sensitivity, is typically used for the PD detection and the triggering of the AE measurement to reduce noise by the averaging of the acoustic signals, allowing the reliable localization of the PD-source [12], [14], [16].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Macro Fiber Composite Sensors for Measurement of Acoustic Partial Discharge Signals in Power Transformers

et al. 2017

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This paper presents a performance assessment of macro fiber composite (MFC) sensors for measuring acoustic emission (AE) signals from partial discharges (PD) in power transformers filled with mineral oil. MFC sensors are low-profile and flexible, allowing them to be attached to uneven surfaces, such as a transformer wall. Two types of MFC sensors were assessed: P1 (d33 effect) and P2 (d31 effect), which are optimized for different deformations in the structure, such as elongation and contraction, respectively. In addition, a conventional AE sensor, R15I-AST model from Physical Acoustics South America, was also used as a reference for comparative analysis. Four metrics were applied to the signals: root mean square, energy criterion, Akaike criterion, power spectral density, and correlation. The experimental results indicate a high similarity between the MFC sensors and the conventional AE sensor, which expands the research field in acoustic PD measurement in power transformers by using low-cost and flexible sensors.

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Identification and localization of PD-sources in power-transformers and power-generators

Cited by 53 publications

References 2 publications

Diagnóstico e Monitoramento de Cabos Isolados através da Análise de Descargas Parciais: O Estado da Arte

Diagnóstico e Monitoramento de Cabos Isolados através da Análise de Descargas Parciais: O Estado da Arte

Ladder‐Wise calculation method for z‐coordinate of transformer PD source based on planar layout UHF antenna sensors

Assessment of Macro Fiber Composite Sensors for Measurement of Acoustic Partial Discharge Signals in Power Transformers

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