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Descripción
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| In the last years continuous on-line PD monitoring applications have been demanded by utilities and large electricity consumers, with the objective of establishing an adequate maintenance of high-voltage (HV) installations. However, no standard exists to define what tests should be passed or what performances should be required for on-line PD monitoring instrumentation, in order to assure accurate diagnosis. Some utilities have defined technical specifications trying to select the most appropriate PD monitoring system, but in general, no standardized test is performed to demonstrate their capabilities and effectiveness. In this regard, an appropriate measuring system should be able to detect PD pulses coming from an internal insulation defect, when they are measured in severe background noise conditions and along with other PD pulses generated in not so critical insulation defects. Furthermore, measuring instrumentation for on-line PD monitoring should be able to detect PD pulses generated by incipient internal insulation defects ?cavity defects?, localize the PD sources (for instance, along a cable system including its cable terminations), and separate them discriminating the critical internal defects from others not so critical (like surface or corona defects). A reference PD generator has been developed to check, in a controlled and homogeneous way, the performances of the PD instruments to be used for on-line PD monitoring according with a specific testing procedure. This reference PD generator has been designed on the basis of a scale model of a real MV/HV installation, in which different PD sources can be placed. The PD sources are generated in small test cells where insulation defects are present. The testing procedure consists in the evaluation of the following performances: 1) sensitivity in the detection of PD sources (noise rejection capability), 2) determination of the PD pulses directionality, 3) capability of PD source localization, 4) discrimination of different PD sources that are acting simultaneously and 5) capability to identify the type of defect. In this paper, the developed PD generator is described and its functionality to check the sensitivity of PD instruments used in on-line monitoring is presented. For the sensitivity test, an arbitrary function generator is used to superimpose electrical noise in the acquired PD pulses, in order to simulate background noise that can appear in HV installations. | |
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Internacional
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Si |
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Nombre congreso
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CIGRE SESSION 2018 (47 Edition) |
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Tipo de participación
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960 |
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Lugar del congreso
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París, Francia |
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Revisores
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Si |
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ISBN o ISSN
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978-2-85873-497-9 |
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DOI
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Fecha inicio congreso
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26/08/2018 |
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Fecha fin congreso
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31/08/2018 |
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Desde la página
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1 |
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Hasta la página
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8 |
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Título de las actas
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CIGRE 2018 Session Papers and Proceedings |