Print Email Facebook Twitter Metrological Qualification of PD Analysers for Insulation Diagnosis of HVDC and HVAC Grids Title Metrological Qualification of PD Analysers for Insulation Diagnosis of HVDC and HVAC Grids Author Garnacho, Fernando (Fundación para el Fomento de la Innovación Industrial (FFII); Universidad Politécnica de Madrid) Álvarez, Fernando (Universidad Politécnica de Madrid) Elg, Alf Peter (Research Institutes of Sweden RISE) Mier Escurra, C. (TU Delft High Voltage Technology Group) Lahti, Kari (Tampere University) Khamlichi, Abderrahim (Fundación para el Fomento de la Innovación Industrial (FFII); Universidad Politécnica de Madrid) Arcones, Eduardo (Universidad Politécnica de Madrid) Klüss, Joni (Research Institutes of Sweden RISE) Mor, A. R. (Universitat Politécnica de Valencia) Date 2023 Abstract On-site partial discharge (PD) measurements have turned out to be a very efficient technique for determining the insulation condition in high-voltage electrical grids (AIS, cable systems, GIS, HVDC converters, etc.); however, there is not any standardised procedure for determining the performances of PD measuring systems. In on-line and on-site PD measurements, high-frequency current transformers (HFCTs) are commonly used as sensors as they allow for monitoring over long distances in high-voltage installations. To ensure the required performances, a metrological qualification of the PD analysers by applying an evaluation procedure is necessary. A novel evaluation procedure was established to specify the quantities to be measured (electrical charge and PD repetition rate) and to describe the evaluation tests considering the measured influence parameters: noise, charge amplitude, pulse width and time interval between consecutive pulses. This procedure was applied to different types of PD analysers used for off-line measurements, sporadic on-line measurements and continuous PD monitoring. The procedure was validated in a round-robin test involving two metrological institutes (RISE from Sweden and FFII from Spain) and three universities (TUDelft from the Netherlands, TAU from Finland and UPM from Spain). With this round-robin test, the effectiveness of the proposed qualification procedure for discriminating between efficient and inappropriate PD analysers was demonstrated. Furthermore, it was shown that the PD charge quantity can be properly determined for on-line measurements and continuous monitoring by integrating the pulse signals acquired with HFCT sensors. In this case, these sensors must have a flat frequency spectrum in the range between several tens of kHz and at least two tens of MHz, where the frequency pulse content is more significant. The proposed qualification procedure can be useful for improving the future versions of the technical specification TS IEC 62478 and the standard IEC 60270. Subject cable insulationcondition monitoringGISHVDC–HVAC transmission and distribution gridsinsulation testingoff-line measurementon-line measurementpartial dischargesqualification procedurestandardisation To reference this document use: http://resolver.tudelft.nl/uuid:f25028b8-5591-4c03-9d8d-22e2cec3e59e DOI https://doi.org/10.3390/s23146317 ISSN 1424-8220 Source Sensors, 23 (14) Part of collection Institutional Repository Document type journal article Rights © 2023 Fernando Garnacho, Fernando Álvarez, Alf Peter Elg, C. Mier Escurra, Kari Lahti, Abderrahim Khamlichi, Eduardo Arcones, Joni Klüss, A. R. Mor, More Authors Files PDF sensors_23_06317_v2.pdf 3.33 MB Close viewer /islandora/object/uuid:f25028b8-5591-4c03-9d8d-22e2cec3e59e/datastream/OBJ/view