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Implementing VLF as diagnostic test for HV motors and generators: A comparative study of diagnostic tests performed at different frequencies
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
2019 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

High voltage testing of the stator winding insulation is one of the most recognized methods used to determine the state of degradation in the insulation. HV tests performed at 0.1 Hz do have potential advantages compared to more traditional 50 Hz tests. This thesis therefore aims to perform and compare tan delta, capacitance and partial discharge measurements on stator windings when using a 0.1 Hz voltage source and a more traditional 50 Hz voltage supply.

Several associated test parameters with considerable influence on the test results were varied during the tests. An associated data analysis followed that was focused on the differences and similarities of the analyzed parameters and the results due to the differences in frequency.

The results show that there are substantial levels of noise present in the partial discharge measurements when utilizing the VLF voltage source. There are also more numerous partial discharges for VLF measurements than for regular power frequency measurements if the same amount of voltage cycles is considered. The generated patterns show similarities with those generated at 50 Hz, but a larger sample base is probably needed for more thorough conclusions. The tan delta/capacitance part of the test do indicate potential advantages compared to power frequency measurements regarding the sensitivity in the measurements.

Place, publisher, year, edition, pages
2019. , p. 84
Series
UPTEC ES, ISSN 1650-8300 ; 19025
Keywords [en]
Dissipation factor, epoxy mica insulation, partial discharges, rotating machines, stator winding insulation, very low frequency
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-393813OAI: oai:DiVA.org:uu-393813DiVA, id: diva2:1355287
External cooperation
ABB Machines
Educational program
Master Programme in Energy Systems Engineering
Supervisors
Examiners
Available from: 2019-10-01 Created: 2019-09-27 Last updated: 2019-10-01Bibliographically approved

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