Real-time analysis of the associated currents of creeping discharge propagating over different liquid/pressboard interfaces under lightning impulse voltages

This paper reports on a comparative experimental study of the current waveforms accompanying the propagation of creeping discharges over different liquid/pressboard interfaces under both negative and positive lightning impulse voltages; the investigated insulating liquids are mineral oil (MO), a syn...

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Bibliographic Details
Published in:Electrical engineering 2023-12, Vol.105 (6), p.4443-4455
Main Authors: Reffas, Abderrahim, Bennia, Abderazak, Aissa, Oualid, Talhaoui, Hicham, Beroual, Abderrahmane, Moulai, Hocine
Format: Article
Language:English
Subjects:
Discharge
Economics and Management
Electrical Engineering
Electrical Machines and Networks
Electrodes
Energy Policy
Engineering
Engineering Sciences
Fourier transforms
Interfaces
Lightning
Mineral oils
Olive oil
Original Paper
Power Electronics
Spectral signatures
Time domain analysis
Waveforms
Citations: Items that this one cites
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Summary:This paper reports on a comparative experimental study of the current waveforms accompanying the propagation of creeping discharges over different liquid/pressboard interfaces under both negative and positive lightning impulse voltages; the investigated insulating liquids are mineral oil (MO), a synthetic ester (SE), a natural ester (NE) and an extra virgin olive oil (OO). Two different arrangements are used; in the first one, the point electrode was positioned in a perpendicular direction to the pressboard, and in the second one, the pressboard was positioned parallel to the axis of the point electrode. Due to the similarity of the recorded creeping discharge current shapes, it is hard to differentiate between the currents measured for each type of interface with time domain approaches. To circumvent this difficulty and identify the specific feature(s) associated to each type of interface, two techniques are used to analyze the signal of the discharge currents, namely discrete wavelet and fast Fourier-transform methods. It is shown that: (1) for the first arrangement, there is a particular spectral signature for each type of liquid/pressboard interface, and (2) for the second arrangement, the obtained results are in accordance to those obtained for the first arrangement only in some cases.
ISSN:0948-7921
1432-0487
DOI:10.1007/s00202-023-01957-6