Topic
Partial discharge
About: Partial discharge is a research topic. Over the lifetime, 13997 publications have been published within this topic receiving 102058 citations. The topic is also known as: PD.
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TL;DR: In this paper, phase resolved partial discharge patterns are complemented with high frequency pulse waveform analysis, in order to identify discharge sources in large power transformers, and these sources are located by means of acoustic measurements with an electrical reference, through the analysis of the acoustic activity detected for each sensor individually.
Abstract: The detection of Partial Discharges (PD) is a reliable technique to analyze the status of electrical insulation in power transformers. Phase resolved partial discharge patterns are being complemented with high frequency pulse waveform analysis, in order to identify discharge sources. In addition to this, acoustic techniques are being implemented trying to locate PD sites in large power transformers. In this work, an inductive loop sensor will be used to identify two different PD sources by means of the energy distribution of the detected waveforms. Additionally, these PD sources will be located by means of acoustic measurements with an electrical reference, through the analysis of the acoustic activity detected for each sensor individually.
58 citations
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TL;DR: In this article, the main features of acoustic emission technique and their physics are addressed, and the structure of acoustic sensors employed for capturing signals is studied, along with the general considerations in the signal processing of the acoustic signals.
Abstract: This paper reviews the main features of acoustic emission technique. First, the characteristics of acoustic signals and their physics are addressed. Then, the structure of acoustic sensors employed for capturing signals is studied. In the next step, the acoustic method of PD measurement is compared with the standard electrical method. Afterward, the applications of AET in PD measurement in different equipment are summarized. All acoustic method and combined acoustic-electrical method for PD localization in transformers are discussed. Moreover, the applications of AET in the monitoring of GIS systems are explained, along with the acoustic behaviors of moving particles in these systems. Finally, the general considerations in the signal processing of the acoustic signals are reviewed.
58 citations
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TL;DR: In this article, the Rogowski coil is employed as a PD measuring sensor and a comparative study of variation in mechanical design features provides a brief guideline to select the optimal design of the coil.
58 citations
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TL;DR: In this paper, the breakdown mechanism of compressed SF6 in gas insulation is known to be controlled by stepped leader propagation, which is reasonably well understood for strongly non-uniform insulation gaps and in the absence of pre-breakdown discharge activity.
Abstract: The breakdown mechanism of compressed SF6 in gas insulation is known to be controlled by stepped leader propagation. This process is reasonably well understood for strongly non-uniform insulation gaps ('point-to-plane') and in the absence of pre-breakdown discharge activity ('corona stabilization'). Open questions still remain for weakly non-uniform insulation gaps with small electrode protrusions (particles, surface roughness), in which pre-breakdown partial discharge (PD) activity is present. This paper presents a first attempt to derive a consistent picture under these conditions, which are characteristic for practical gas insulation systems. Experiments were carried out in a uniform field gap with a short protrusion on one electrode. This configuration was studied at various pressures from 0.1 to 0.5?MPa and both polarities using electrical and optical diagnostics. The results are interpreted using a quantitative model and order-of-magnitude estimates. The emerging picture allows prediction of most of the technically relevant aspects of the discharge processes and their main parameter dependences. It comprises statistical time lags, formative time lags including pre-breakdown PD activity and breakdown fields as a function of gas pressure, protrusion length and polarity.
57 citations
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30 Aug 2000
TL;DR: In this article, an apparatus for detecting partial discharge in on-line high voltage electrical equipment containing a dielectric, such as high voltage transformers, is described. But this apparatus includes an ultrasonic transducer and an annular capacitive plate for detecting, respectively, the ultrasonic pulse and the radio frequency pulse generated by the occurrence of a partial discharge.
Abstract: An apparatus for detecting partial discharge in on-line high voltage electrical equipment containing a dielectric, such as high voltage transformers. The apparatus includes an ultrasonic transducer (16) and an annular capacitive plate (15) for detecting, respectively, the ultrasonic pulse and the radio frequency pulse generated by the occurrence of a partial discharge in the equipment. The outputs of the transducers are analysed by signal processing means to allow determination of occurrences of true partial discharge from the plethora of electrical noise normally present in on-line high voltage equipment.
57 citations