Investigating partial discharge UHF electromagnetic waves propagation in transformers using FDTD technique and 3D simulation

Zanjani, M.; Akbari, Asghar; Mirzaei, Hassan Reza; Gockenbach, E.; Borsi, H.

doi:10.1109/cmd.2012.6416187

Cited by 11 publications

(10 citation statements)

References 2 publications

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“…A Gaussian current signal with a frequency spectrum in the VHF-UHF band has been used to excite in the simulated PD sources. The Gaussian signal is [7,16]:…”

Section: Fsr Pd Measurements and Simulationsmentioning

confidence: 99%

“…An emulator of the floating-electrode type and two internal PD emulators are depicted in Figure 2. The CST Microwave Studio software package, which can simulate transient electromagnetic fields using the FDTD (Finite Difference Time Domain) technique, has been used to model these emulators [7,8]. To measure PD from the different emulators, the setup shown in Figure 3 is used.…”

Section: Introductionmentioning

confidence: 99%

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Validation of partial discharge emulator simulations using free-space radiometric measurements

Jaber

Lazaridis

Saeed

et al. 2016

2016 International Conference for Students on Applied Engineering (ISCAE)

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A useful technique to estimate the degradation of insulation in high voltage (HV) installations is the measurement of partial discharge (PD). Free-space radiometric (FSR) detection of PD is a relatively new technique. Several types of PD emulator sources have been constructed: two internal PD emulators and a floating electrode emulator. The emulators have been simulated using the CST Microwave Studio software package. The intention is to use the simulated emulators to establish a relationship between radiated PD signals and PD intensity as defined by apparent charge transfer. To this end the radiated fields predicted in the simulations are compared with measurements. There is sufficient agreement between simulations and measurements to suggest the simulations could be used to investigate the relationship between PD intensity and the field strength of radiated signals.

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“…A Gaussian current signal with a frequency spectrum in the VHF-UHF band has been used to excite in the simulated PD sources. The Gaussian signal is [7,16]:…”

Section: Fsr Pd Measurements and Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Validation of partial discharge emulator simulations using free-space radiometric measurements

Jaber

Lazaridis

Saeed

et al. 2016

2016 International Conference for Students on Applied Engineering (ISCAE)

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“…It is possible to detect and locate PD defects in the early stage of development by measuring and analyzing PD data and take suitable maintenance and repair action. Since now several detection and localization methods like electrical [1][2][3][4], acoustic [5] and ultra-high frequency (UHF) detection [6][7][8][9][10][11] methods have been used in the power transformer. Although the electrical PD detection is sensitive to weak PD activities, it could only predict the turn number of the winding in which PD occurs (1-D localization).…”

Section: Introductionmentioning

confidence: 99%

“…Although the acoustic PD detection could perform 3-D defect localization, it is not very sensitive to weak PDs and those which appear deep inside the winding. Due to high sensitivity, 3-D localization capability and noiseless measurement, the UHF PD detection method has attracted more attentions these days [6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Advancing new techniques for UHF PDdetection and localization in the power transformers in the factory tests

Mirzaei

Akbari

Gockenbach

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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Partial discharge (PD) detection in the ultra-high frequency (UHF) range is state of the art. One of the most critical points in this detection method is adopting proper and suitable antenna design. In this paper, a new design of UHF antennas is introduced which is suitable to be used on the transformers in the HV laboratories of the manufacturers. To ensure the applicability of the new antenna, experimental UHF PD measurements are carried out on a transformer tank model as well as on the real power transformers. Installing several UHF antennas on the transformer tank to perform defect localization is also an important issue. There are rigorous limitations and lack of the places to install the antennas. This problem is almost solved by using the mentioned new antenna design. The proper positioning of the antennas is the other critical point in the UHF method. Placing the antennas in improper positions will damage the localization accuracy. In this paper, an automatic algorithm is introduced to determine the best installation positions for the antennas to enhance the localization accuracy. The efficacy of this algorithm is investigated by using the results of experimental measurements on power transformers.

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“…Since partial discharge accompanied by an acoustic wave and an electromagnetic wave, a newly developed sensor such as an acoustic sensor, and UHF sensor are usually been employed for PD detection and finding the location of the defects [6][7][8][9][10][11][12]. However, it is very difficult for UHF antenna to locate the defects when partial discharge occurs and propagates through complex structures and the insulation medium of the transformer [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Partial Discharge Induced Electromagnetic Wave in Power Transformer

Kawashima

Hozumi

et al. 2018

EPI-IJE

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This paper describes the numerical simulation of partial discharge (PD) in oil-filled power transformer using FDTD method (Finite Difference Time Domain). We investigate the effects of oil insulation medium and internal structures on the propagation of electromagnetic signal emitted from the partial discharge source. In this study, partial discharge is modeled as the Gaussian Pulse (pulse's width 1 ns). To observe the electromagnetic intensity and also the voltage distribution, three sensors are employed. The magnitude, frequency, and attenuation of the EM wave without internal structures and with internal structures are compared. The Results show that the EM wave intensity is attenuated while propagating through the oil insulation, iron-core, and windings. And the time arrival of each signal is different due to its distance from the PD source. The simulation results in both cases show that the first dominance frequency occurs in 1 GHz of frequency. However, the frequency spectrum of simulation with internal structures has resonance frequencies in the low region from 80 MHz to 300 MHz of frequency. These resonance frequencies occur because the windings are considered to be a loop antenna.

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Investigating partial discharge UHF electromagnetic waves propagation in transformers using FDTD technique and 3D simulation

Cited by 11 publications

References 2 publications

Validation of partial discharge emulator simulations using free-space radiometric measurements

Validation of partial discharge emulator simulations using free-space radiometric measurements

Advancing new techniques for UHF PDdetection and localization in the power transformers in the factory tests

Simulation of Partial Discharge Induced Electromagnetic Wave in Power Transformer

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