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Metrological Qualification of PD Analysers for Insulation Diagnosis of HVDC and HVAC Grids
FFII-LCOE Fundación para el Fomento de la Innovación Industrial, Spain; Universidad Politécnica de Madrid, Spain.
Universidad Politécnica de Madrid, Spain.
RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.ORCID iD: 0000-0001-5044-8266
Delft University of Technology, Netherlands.
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2023 (English)In: Sensors, E-ISSN 1424-8220, Vol. 23, no 14, article id 6317Article in journal (Refereed) Published
Abstract [en]

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. © 2023 by the authors.

Place, publisher, year, edition, pages
Multidisciplinary Digital Publishing Institute (MDPI) , 2023. Vol. 23, no 14, article id 6317
Keywords [en]
cable insulation, condition monitoring, GIS, HVDC–HVAC transmission and distribution grids, insulation testing, off-line measurement, on-line measurement, partial discharges, qualification procedure, standardisation, Cable sheathing, HVDC power transmission, Insulation, Pulse repetition rate, Standardization, Distribution grid, HVAC transmissions, HVDC–HVAC transmission and distribution grid, Line measurements, Transmission and distribution, Transmission grids
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:ri:diva-65682DOI: 10.3390/s23146317Scopus ID: 2-s2.0-85166031162OAI: oai:DiVA.org:ri-65682DiVA, id: diva2:1786821
Note

The research presented in this paper has received funding from the project 19ENG02 FutureEnergy of the EMPIR programme, co-financed by the Participating States and from the European Union’s Horizon 2020 research and innovation programme.

Available from: 2023-08-10 Created: 2023-08-10 Last updated: 2023-08-10Bibliographically approved

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Elg, Alf PeterKlüss, Joni

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