Creeping discharges features propagating in air at atmospheric pressure on various materials under positive lightning impulse voltage – part 1: noise suppression using the discrete wavelet transform approach

Douar, M. A.; Béroual, Abderrahmane; Souche, X.

doi:10.1049/iet-gtd.2017.1092

Cited by 4 publications

(7 citation statements)

References 73 publications

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“…According to previous works [20,21], the computation of the discharges velocity using different theoretical approaches evidenced some differences with empirical values. Indeed, the discharges velocity computed with equation ( 12) exhibits different values than those calculated with the expression provided by Les Renardières Group [21].…”

Section: Discharges Velocity and Its Influencing Factorsmentioning

confidence: 90%

“…In this paper, effects of lightning impulse voltage under positive polarity on the propagation of creeping discharges over various solid dielectrics are analyzed. As described in previous publications [20,21], the main concerns were about (i) de-noising some data such as current, voltage and captured images at first [20], and then moving to (ii) modeling and calculation of discharges parameters using different mathematical formulations for more accuracy [21]. In this survey study, an attempt to explain various physical phenomena, observation and results obtained during experiments (namely the discharges morphology, the velocity and then the space charges influence) is presented as an overview of the discharges growth mechanism in air, depending on the used polymeric interface, and to identify the mutual interaction that exists between discharges and assessed plastics.…”

Section: Introductionmentioning

confidence: 94%

“…The tested materials belong to three distinguishable polymeric families [20,21]: (1) thermoplastics (namely polyamide 6 filled with 50 wt.% of glass fibers (noticed as PA6/50, Fig. 2a) and polyamide 66 filled with 50 wt.% of glass fibers (noticed as PA66/50, Fig.…”

Section: Test Setupmentioning

confidence: 99%

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Ignition and advancement of surface discharges at atmospheric air under positive lightning impulse voltage depending on perpendicular electric stress and solid dielectrics: modelling of the propagating phenomenology

Douar

Béroual

Souche³

2018

Eur. Phys. J. Appl. Phys.

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In many high voltage equipment, partial discharges are regarded as one of the most widespread pathology whose ignition conditions and effects are studied by scientists and manufacturers to avoid major failures. Actually, those electrical gaseous phenomena generally occur under several constraints such as the electrostatic field level, the nature of insulating surface being polluted or not, and switching or lightning transients. The present paper discusses physical mechanisms related to the creeping discharges propagation growing over insulators subjected to perpendicular electric field and positive lightning impulse voltage. More precisely, the developed discussion attempts to answer some observations especially noticed for main discharges feature namely (i) the discharges morphology, (ii) their velocity and (iii) the space charges effects on electric field computation. Several factors like (i) the influence of the type of a material’s interface, its electric conductivity, permittivity and discharges mobility, (ii) the relationship between the applied electrostatic field, the space charges, the velocity, the propelling pressure and discharges temperature are among numerous parameters that have been addressed in this study which discusses lightning impulse transients phenomena.

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Section: Discharges Velocity and Its Influencing Factorsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 94%

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Ignition and advancement of surface discharges at atmospheric air under positive lightning impulse voltage depending on perpendicular electric stress and solid dielectrics: modelling of the propagating phenomenology

Douar

Béroual

Souche³

2018

Eur. Phys. J. Appl. Phys.

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“…Therefore, the discrete wavelet transform is suitable for online calculation. Discrete wavelet transform decomposes the dynamic signal into the various scales of frequency bands by multiresolution analysis [15,16]. The DWT of a signal f (t) takes this form…”

Section: The Principle Of Discrete Waveletmentioning

confidence: 99%

Change Point Detection for Piecewise Envelope Current Signal Based on Wavelet Transform

Wang¹,

Zhou²,

Jiang³

et al. 2018

Journal of Electrical and Computer Engineering

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One of the key issues of the accurate parameters analysis for the piecewise envelope current signal is to position the change point precisely. Discrete wavelet transform (DWT) modulus maxima method can detect change point, but the detection window of DWT will cause suspicious change point. Besides, the amount of calculated data is very large in actual process of envelope current signal. Therefore, in this paper, the envelope is used instead of the original sampling data for DWT so as to reduce the calculation amount. What is more, combined with the sliding dislocation window method, the change point can be located accurately and the pseudo-change point can be eliminated. The simulation results as well as the electric locomotive current and forging machine current examples show that it is feasible to detect the change point precisely through the proposed method, which provides possibilities for real-time online monitoring of change point.

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“…Further, various authors have suggested, [13][14][15][16] travelling wave based fault detection and identification techniques using wavelets for transmission line protection. A DWT and entropy-based approach is suggested 17,18 to detect the lighting faults on the transmission line. The method fails to detect low fault currents, that is, during high impedance faults and unable to discriminate the faulted phase from healthy phases.…”

Section: Introductionmentioning

confidence: 99%

Hilbert‐Huangtransform based fault identification and classification technique forACpower transmission line protection

Anand

Affijulla

2020

Int Trans Electr Energ Syst

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In the modern power system, the fault identification and classification is one of the challenging tasks during high fault impedance due to low change in the magnitude of fault current from steady-state to fault inception. In this paper, a high impedance fault detection technique is proposed based on Hilbert-Huang transform (HHT). The energy for each phase is computed from the intrinsic mode function (IMF) of three-phase voltage/current signals. An average relay energy index (AREI) is proposed to detect the transmission line fault in the large interconnected power system. Furthermore, a fault classification technique is also proposed based on relay energy index (REI) of each phase of the three-phase voltage/current signals. The proposed HHT based fault detection technique is validated on standard WSCC 9 bus and IEEE 14 bus test power systems using PSCAD and MATLAB software. The simulation results reveal that the proposed Hilbert-Huang transform based fault identification and classification technique can be best suitable for protection of transmission lines during high impedance faults in complex and large AC power transmission system.

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Creeping discharges features propagating in air at atmospheric pressure on various materials under positive lightning impulse voltage – part 1: noise suppression using the discrete wavelet transform approach

Cited by 4 publications

References 73 publications

Ignition and advancement of surface discharges at atmospheric air under positive lightning impulse voltage depending on perpendicular electric stress and solid dielectrics: modelling of the propagating phenomenology

Ignition and advancement of surface discharges at atmospheric air under positive lightning impulse voltage depending on perpendicular electric stress and solid dielectrics: modelling of the propagating phenomenology

Change Point Detection for Piecewise Envelope Current Signal Based on Wavelet Transform

Hilbert‐Huangtransform based fault identification and classification technique forACpower transmission line protection

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