PERFORMANCE OF ZINC OXIDE-VANADIUM PENTOXIDE VARISTORS IN MEDIUM VOLTAGE SURGE ARRESTERS

Authors

  • MAGDALENA-VALENTINA LUNGU National Institute for Research and Development in Electrical Engineering ICPE-CA (INCDIE ICPE-CA) Bucharest, 313 Splaiul Unirii Street, 030138, Bucharest, Romania Author https://orcid.org/0000-0002-5399-6847
  • ALINA CARAMITU National Institute for Research and Development in Electrical Engineering ICPE-CA (INCDIE ICPE-CA) Bucharest, 313 Splaiul Unirii Street, 030138, Bucharest, Romania Author https://orcid.org/0000-0002-7751-9324
  • MIHAI MARIN National Institute for Research and Development in Electrical Engineering ICPE-CA (INCDIE ICPE-CA) Bucharest, 313 Splaiul Unirii Street, 030138, Bucharest, Romania Author https://orcid.org/0000-0001-5437-6896
  • DELIA PĂTROI National Institute for Research and Development in Electrical Engineering ICPE-CA (INCDIE ICPE-CA) Bucharest, 313 Splaiul Unirii Street, 030138, Bucharest, Romania Author https://orcid.org/0000-0003-1579-423X
  • VIRGIL MARINESCU National Institute for Research and Development in Electrical Engineering ICPE-CA (INCDIE ICPE-CA) Bucharest, 313 Splaiul Unirii Street, 030138, Bucharest, Romania Author https://orcid.org/0000-0001-6958-1788
  • CIPRIAN MANEA National Institute for Research and Development in Electrical Engineering ICPE-CA (INCDIE ICPE-CA) Bucharest, 313 Splaiul Unirii Street, 030138, Bucharest, Romania Author https://orcid.org/0000-0001-9437-4051
  • PETRIŞOR GODEANU MAIRA MONTAJ SRL, 38A Inovatorilor Street, 012417, Bucharest, Romania Author https://orcid.org/0000-0002-3011-7125
  • ALEXANDRA BARBU MAIRA MONTAJ SRL, 38A Inovatorilor Street, 012417, Bucharest, Romania Author

DOI:

https://doi.org/10.59277/RRST-EE.2024.2.11

Keywords:

Advanced functional materials, Metal oxides, ZnO-V2O5 varistors, Medium voltage surge arresters

Abstract

Metal oxide varistor (MOV) discs (Ø28 mm × 12 mm) made of 97.5 mol.% zinc oxide (ZnO), and 0.5 mol.% each of vanadium pentoxide (V2O5), tin (IV) oxide (SnO2), antimony(III) oxide (Sb2O3), cobalt(II, III) oxide (Co3O4), and chromium(III) oxide (Cr2O3) additives were produced using powder metallurgy. The obtained MOVs were polycrystalline with high density. This study focused on analyzing the microstructure and mechanical and electrical properties of the MOVs. The developed MOVs had a fine-grained microstructure with an average ZnO grain size of about 10 μm. The Ag-coated MOV discs tested in a range of 100 – 1300 V ac exhibited a leakage current of 0.033 – 1.420 mA and a minimum varistor voltage of 2.37 ± 0.15 kV. After conducting functional tests on Ag-coated MOVs installed in polymer-housed surge arresters, it was found that they are suitable for use in medium voltage arresters with a nominal voltage (Un) of 25 kV, a continuous operating voltage (Uc) of 12 kV and a leakage current (IL) of 1 mA.

Author Biography

  • MAGDALENA-VALENTINA LUNGU, National Institute for Research and Development in Electrical Engineering ICPE-CA (INCDIE ICPE-CA) Bucharest, 313 Splaiul Unirii Street, 030138, Bucharest, Romania

    Magdalena Valentina Lungu is a Senior Researcher with a Ph.D. in Materials Engineering and Science and has expertise in advanced materials synthesis, innovative product development, powder metallurgy techniques, spark plasma sintering (SPS), Dynamic and Electrophoretic Light Scattering (DLS and ELS) methods, UV-Vis spectroscopy, tribological and mechanical testing (micro/nanoindentation and microscratch). She is an Expert Evaluator and Rapporteur for the remote evaluation of project proposals in some international R&D programmes (HORIZON, RFCS, H2020, M-Era.Net, a.o.). She is a reviewer for 101 peer-reviewed journals indexed in WoS (IOP Publishing, Elsevier, MDPI, Springer, Taylor & Francis, RSC, Wiley, Hindawi, Nature Publishing Group, World Scientific, a.o.).

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Published

07.07.2024

Issue

Vol. 69 No. 2 (2024): RRST-EE

Section

Électrotechnique et électroénergétique | Electrical and Power Engineering

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How to Cite

PERFORMANCE OF ZINC OXIDE-VANADIUM PENTOXIDE VARISTORS IN MEDIUM VOLTAGE SURGE ARRESTERS. (2024). REVUE ROUMAINE DES SCIENCES TECHNIQUES — SÉRIE ÉLECTROTECHNIQUE ET ÉNERGÉTIQUE, 69(2), 183-188. https://doi.org/10.59277/RRST-EE.2024.2.11