Partial Discharge Behavior of Typical Defects in Power Equipment Under Multilevel Staircase Voltage

Zang, Yiming; Niasar, Mohamad Ghaffarian; Ganeshpure, Dhanashree Ashok; Qian, Yong; Sheng, Gehao; Jiang, Xiuchen; Vaessen, Peter

doi:10.1109/tdei.2022.3185567

Cited by 5 publications

(2 citation statements)

References 25 publications

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“…In terms of harmonic spectra, more-complicated cases will concern PWM-modulated modular multilevel converters (MMCs) [38]. However, higher numbers of levels (smaller step voltages) result in smaller magnitudes of partial discharges in MMCs [39], [40]. The calculations of a magnetic field level in a modular multilevel converter in an HVDC application is shown in [41].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Field Effects on Partial Discharges in Electrical Insulation Subjected to PWM Excitation

Florkowski

2024

IEEE Trans. Power Electron.

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This article depicts an original measurement methodology and detection approach for determining the influence of a magnetic field on partial discharge (PD) dynamics in electrical insulation while subjected to pulse-width modulated (PWM) excitation. Unlike conventional PD measurements that are only carried out in an electric field, it was demonstrated that the interplay of electric and magnetic fields enhances a PD's intensity. The quantitative effect of a magnetic field was captured by phaseresolved acquisition and visualization on time-sequence intensity diagrams. The increase in the PWM carrier frequency resulted in enhanced intensity and was also elevated by the effect of the magnetic field. The influence of the magnetic field on the PDs was associated with the elongation of the charged particle trajectory and effects that were caused by the Lorentz force. The presented study may contribute to PD measurement methodology in the power electronic environment in both electric and magnetic fields as well as a better understanding of the underlying physical mechanisms. Since the endurance and reliability of electrical insulation that is subjected to fast switching, PWM-modulated power electronic-based excitation is an actual topic in many segments, such as power grids, industry, and transportation; the awareness of PD-intensity modulation that originates from the presence of a magnetic field should be raised and investigated.Index Terms -partial discharge (PD), pulse width modulation (PWM), impact of magnetic field, electrical insulation, twisted pair magnet wires.1

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Section: Introductionmentioning

confidence: 99%

Magnetic Field Effects on Partial Discharges in Electrical Insulation Subjected to PWM Excitation

Florkowski

2024

IEEE Trans. Power Electron.

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“…Infrared image technology quickly and automatically detects mechanical structure defects, improves detection speed and accuracy, and reduces the workload of manual detection. Timely detection and treatment of mechanical structure defects effectively extends the service life of equipment, and reduces maintenance costs and equipment replacement frequency [9][10][11][12][13][14][15][16][17][18]. It is of important research significance and broad application value to process infrared images of mechanical structures after high temperature and detect their defects, because it helps improve safety, efficiency, and reliability of equipment in various fields.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Structure Defect Detection after High Temperature Based on Image Processing

Jiao¹

2023

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Mechanical structures may exhibit defects during long-time high-temperature operation. Infrared image technology quickly and automatically detects mechanical structure defects, improves detection speed and accuracy, and reduces the workload of manual detection. Although high-temperature infrared image processing method has made significant progress in detecting the defects, it still has some shortcomings. Defect features in high-temperature infrared images may not be obvious and are mixed with background information, thus making it difficult to accurately identify and extract them. Therefore, this research studied the detection method of mechanical structure defects after high temperature based on image processing. Transform domain denoising method was used to decompose the transform domains of images, which distinguished signals and noises in the images. Adaptive Contrast Enhancement (ACE) algorithm was used to enhance the images. A feature fusion imaging detection framework for infrared and optical imaging of high-temperature mechanical structures was constructed, which improved the accuracy and reliability of defect detection. Deep neural network was combined with the heuristic fusion section, which further explored deep features in the images and improved the fusion effects. The proposed fusion features were processed using binary tree classification and hierarchical classifier, which accurately identified the abnormal defect regions in the infrared images of high-temperature mechanical structures. The experimental results verified that the proposed method was effective.

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Design of a high‐frequency transformer based on amorphous cut cores for insulation breakdown testing

Lagerweij,

Niasar

2024

High Voltage

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Innovative test methods are required to keep up with the increased demand for insulation materials which can withstand the high‐frequency square‐wave voltages generated by power‐electronic equipment. Test systems using high‐voltage, high‐frequency transformers have proven versatile and easy to realise. The authors investigate the application of amorphous cut cores in such transformers. Analytical and numerical models for the transformer and its frequency response are developed, aiding the design process. An amorphous core‐based transformer is designed for 8 kVpk output at 100 kHz and compared to two previous designs based on ferrite cores. The frequency and pulse response, as well as the high‐voltage and thermal performance, are evaluated. The comparison shows that while the low parasitics of the amorphous‐based transformer allow for superior frequency response, they are unsuitable for long‐duration tests with high pulse repetition frequencies (25–100 kHz) due to increased core losses. The partial discharge inception and flashover voltage are comparable to the ferrite‐based transformers.

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Partial Discharge Behavior of Typical Defects in Power Equipment Under Multilevel Staircase Voltage

Cited by 5 publications

References 25 publications

Magnetic Field Effects on Partial Discharges in Electrical Insulation Subjected to PWM Excitation

Magnetic Field Effects on Partial Discharges in Electrical Insulation Subjected to PWM Excitation

Mechanical Structure Defect Detection after High Temperature Based on Image Processing

Design of a high‐frequency transformer based on amorphous cut cores for insulation breakdown testing

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