A novel technique for partial discharge and breakdown investigation based on current pulse waveform analysis

Ōkubo, H.; Hayakawa, Naoki

doi:10.1109/tdei.2005.1511099

Cited by 109 publications

(42 citation statements)

References 5 publications

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“…For example the speed of propagation in cross linked polyethylene cables (XLPE) is approximately 170m/μs and in gas insulated systems 300m/μs. The ultra wideband detection (UWD) for the measurement of the true shape of a PD pulse has been successfully applied for many years [e.g 52,53]. The separation technique consisting of two components based on time-domain measurements has been proposed in [54].…”

Section: Impact Of Harmonics On Pd Imagesmentioning

confidence: 99%

Exploitation stresses and challenges in diagnostics of electrical industrial equipment

Florkowski

2011

2011 IEEE International Symposium on Industrial Electronics

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Exploitation strategies of electric power and industrial equipment, stimulated mainly by economic and environmental trends, play a crucial role in ensuring uninterrupted power delivery and continuous operation. The diagnostics of industrial equipment is particularly important in this context, due to both operational multistresses and the strive for higher and higher voltage levels as well as due to increasing requirements with respect to safety, security and reliability in electric power and industrial networks. Modern diagnostics is a multidisciplinary domain. The development of power electronics, sensors, optoelectronics, communication, information technology and new materials has a strong influence on new approaches. This keynote will address the challenges and trends of modern diagnostics with a special focus on electric insulation systems exposed to power electronics stimuli. The main challenge nowadays is the proper interpretation of acquired diagnostic information and correlation with physical phenomena and degradation processes. Various complementary methods will be presented along with industrial examples; like the signal and image processing methods applied for assessing pulse diagnostic symptoms coming from stochastic signals of partial discharges in various structures of the insulation systems and high frequency response analysis applied to winding assessment. New challenges caused by electronic converters subjecting and stressing the electric insulation systems with high slew rate and repetition frequency of switching pulses is shown. The noninvasive and non-destructive character of applied methods make them especially attractive for diagnostics and monitoring purposes. Further, from the global perspective, reliability and safety drive the recent trends in industrial diagnostics.

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Section: Impact Of Harmonics On Pd Imagesmentioning

confidence: 99%

Exploitation stresses and challenges in diagnostics of electrical industrial equipment

Florkowski

2011

2011 IEEE International Symposium on Industrial Electronics

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“…This is especially important in the case of using this technique with the machine in operation. Following this trend, the analysis of the waveform of the pulse PD is also used for separating partial discharges from electrical noise and even to classify different PD sources (Okubo & Hayakawa, 2005;Cavallini, Montanari, Contin & Pulletti, 2003;Robles, Martinez-Tarifa, Rojas-Moreno & Sanz-Feito 2009).…”

Section: Introductionmentioning

confidence: 99%

A new monitoring and characterization system of partial discharges based on the analysis of the spectral power

2015

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Partial Discharges (PD) are one of the possible causes for unexpected faults in power systems equipment, so that its measure is an essential tool for high-voltage electrical equipment maintenance. In order to characterize the PD activity, some statistic magnitudes are necessary. For this reason, the acquisition and processing of PD is very important when making critical decisions regarding disconnection or repairing assets in power systems. On the other hand, the measurement environments often present multiple sources of electrical noise, thus the proper interpretation of PD patterns is a challenge in the identification of sources of different nature. In this paper, the development of a PD monitoring system capable of displaying in real time the classic PD parameters, the PD waveform, its frequency spectrum and calculating statistical parameters of the acquisition, are presented. On the whole, a new method of identifying sources of PD and electrical noise, developed by the authors, which is based on measuring the relative spectral power of PD pulses, is shown. This method has proven effective in characterizing PD and electrical noise; a series of experiments conducted in several test objects are presented in order to validate the performance of the proposed system. Keywords:Partial discharges, electrical insulation, PD pulse waveform, spectral power, fast Fourier transform. RESUMENLas descargas parciales (PD) son responsables de las fallas inesperadas en los equipos de sistemas de potencia, por lo que su medida es una herramienta fundamental en el mantenimiento de equipos eléctricos de Alta Tensión. Con el fin de caracterizar la actividad de PD, algunas magnitudes estadísticas son necesarias. Por esta razón, la adquisición y procesamiento de PD es muy importante en el momento de tomar decisiones críticas en relación con la desconexión o reparación de los sistemas de potencia. Por otro lado, los entornos de medida suelen tener presentes múltiples focos de ruido eléctrico, por lo que la interpretación adecuada de patrones de PD es un reto al que se añade la identificación de fuentes de diferente naturaleza. En este artículo se presenta el desarrollo de un sistema de monitorización de descargas parciales, capaz de visualizar en tiempo real los parámetros clásicos de descargas parciales, la forma de onda de un pulso de PD, su espectro de frecuencia y calcular los parámetros estadísticos de la adquisición. Conjuntamente se presenta un nuevo método de identificación de fuentes de PD y ruido eléctrico que han desarrollado los autores, el cual se basa en la medida de la potencia espectral relativa de los pulsos de PD. Éste método ha probado ser eficiente en la caracterización de PD y ruido eléctrico, Una serie de experimentos realizados en varios objetos de ensayo son presentados, con el fin de validar el comportamiento del sistema propuesto.Palabras clave: Descargas parciales, aislamiento eléctrico, forma de onda de los pulsos de PD, potencia espectral, transformada rápida de Fourier. Received

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“…Firstly, with regard to the PD phenomenon, Section 2 presents the detailed observation results of the PD current of the discharge in gas up to a high frequency band exceeding 10 GHz [15], as well as the study results of the insulation characteristics where micro-defects are present inside the epoxy insulator [16], the detectability of the UHF method with respect to the length of harmful particles inside GIS [17], and both experimental and numerical approaches on propagation phenomena of PD signal in GIS [18]. Subsequently, with regard to further refinement of the diagnostic technique and the calibration and verification method, Section 3 describes a new less uncertain and inexpensive UHF sensor calibration system using a conical antenna [19,20] and a more advanced UHF diagnostic technology whereby the influence of the shape and structures of GIS on PD signal propagation is taken into consideration [21,22], as well as a UHF measurement system sensitivity verification method on the site using a network analyzer [23] to substitute the CIGRE method [13], and the novel technique for PD and breakdown investigation based on current pulse waveform analysis [24].…”

Section: Introductionmentioning

confidence: 99%

New aspects of UHF PD diagnostics on gas-insulated systems

Okabe

Ueta

Hama

et al. 2014

IEEE Trans. Dielect. Electr. Insul.

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Gas insulated switchgears (GIS) have been increasingly introduced as main substationequipment since the late 1960s thanks to their high reliability, safety, and compactness. The UHF method to diagnose partial discharge (PD) is broadly employed in the field as an advanced insulation diagnostic technology. There are three primary factors related to the PD signal detection characteristics using this UHF method; namely the frequency spectrum of the PD signal itself inside GIS, the propagation characteristics of the PD signal inside the GIS tank, and the detection characteristics of the sensor measuring the PD signal. Accordingly, to further improvement of the diagnostic technique based on the UHF method, the PD phenomenon itself and its propagation characteristics should be clarified and the measurement system refined. From these perspectives, the present study reviewed the recent and latest findings concerning the PD phenomenon and its propagation characteristics inside GIS as well as the PD measurement system verification methods and diagnostic technologies, and summarized typical examples. Firstly, with regard to the PD phenomenon, measurement up to the high frequency band exceeding 10 GHz (even 30 GHz) clarified that the rise time of the PD current waveform is several tens of picoseconds, shorter than previously known. In the case of PD in micro-defects inside the epoxy insulator, however, the rise time is relatively long, in the order of nanoseconds, and a crack is the most critical defect. Subsequently, with regard to UHF PD diagnostics/monitoring technology, a novel technique using PD current waveform characteristics has been developed, and a more advanced PD diagnostic algorithm has been established by clarifying the influence of the shape and GIS internal structures on the electromagnetic wave propagation characteristics. Less uncertain and simplified calibration and verification technologies are also proposed both for a single UHF sensor and the entire UHF measurement system. These new technologies and further advanced studies in future are expected to make the UHF method more convenient and sophisticated.

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A novel technique for partial discharge and breakdown investigation based on current pulse waveform analysis

Cited by 109 publications

References 5 publications

Exploitation stresses and challenges in diagnostics of electrical industrial equipment

Exploitation stresses and challenges in diagnostics of electrical industrial equipment

A new monitoring and characterization system of partial discharges based on the analysis of the spectral power

New aspects of UHF PD diagnostics on gas-insulated systems

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