Design and Optimization of UHF Partial Discharge Sensors using FDTD Modeling

Ishak, A. M.; Ishak, Mohd Taufiq; Jusoh, Mohd Taufik; Dardin, Syed Fairuz Syed; Judd, M.D.

doi:10.1109/jsen.2016.2628035

Cited by 33 publications

(18 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, in this section, maintaining H to be 1 cm and the PD source is in positive direction of Z-axis. Depth D of the transformer was adjusted to 18,16,14,12,10,8,6,4, and 2 cm separately, studying the influence of gap depth on the gap propagation characteristics of the PD electromagnetic wave, where the corresponding d…”

Section: Influence Of Gap Depth On Gap Propagation Characteristics Ofmentioning

confidence: 99%

“…Currently, UHF antenna sensors are primarily inserted into transformers via handholes [2] and oil drain valves [3] or placed outside by the addition of a dielectric window [4][5][6]. Built-in antenna sensors can effectively shield the sensor from the electromagnetic interference in the surrounding environment, but two problems exist: (1) the built-in antenna sensors will change the internal structure of the transformer, which may damage the uniform distribution of the internal electromagnetic field; (2) for transformers in operation, electric power companies are always unwilling to allow retrofitting.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

On the Feasibility of Gap Detection of Power Transformer Partial Discharge UHF Signals: Gap Propagation Characteristics of Electromagnetic Waves

Zhang

et al. 2017

Energies

View full text Add to dashboard Cite

This study analyzed the transformer electromagnetic gap propagation characteristics. The influence of gap size is also analyzed, and the results experimentally verified. The obtained results indicated that the gap propagation characteristics of electromagnetic wave signals radiated by the partial discharge (PD) source in different directions are substantially different. The intensity of the electromagnetic wave in the gap reaches a maximum at a gap height of 1 cm; and inside the gap, the intensity of the electromagnetic wave depicted an increasing trend at the tail area of the gap. Finally, from the obtained results, some suggestions on where to install sensors in practical systems for ultra high frequency (UHF) PD signal detection in the transformer gap are provided. The obtained results confirmed the feasibility of using this approach. These results can be seen as a benchmark and a challenge for further research in this field.

show abstract

Section: Influence Of Gap Depth On Gap Propagation Characteristics Ofmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Feasibility of Gap Detection of Power Transformer Partial Discharge UHF Signals: Gap Propagation Characteristics of Electromagnetic Waves

Zhang

et al. 2017

Energies

View full text Add to dashboard Cite

show abstract

“…Since then, FDTD modeling has been used to investigate PD propagation problems in GIS [5][6][7] and transformers [8][9][10]. FDTD modeling has also been found effective in assisting with optimizing design and installation of UHF PD sensors for GIS and transformers [11,12]. In terms of applications to PD measurement for HV cables, some work has been seen using FDTD modeling to investigate sensitivity of field PD sensors [13,14] and high frequency properties of HV cables [15,16].…”

Section: Introductionmentioning

confidence: 99%

Modeling of High-Frequency Current Transformer Based Partial Discharge Detection in High-Voltage Cables

Siew

Judd³

et al. 2019

IEEE Trans. Power Delivery

View full text Add to dashboard Cite

Partial discharge (PD) testing of high voltage (HV) cables and cable accessories has been implemented predominantly using high frequency current transformers (HFCTs) as PD sensors. PD currents initiating at PD sources are coupled onto cable conductors and travel away from the PD sources and will be detected by HFCTs installed at cable terminations. In this paper, based on combining finite-difference time-domain (FDTD) modeling and transfer function theory, a hybrid modeling approach is proposed to investigate the processes of PD coupling and detection involved in HFCT-based PD testing of HV cables. This approach allows exciting a PD event anywhere in FDTD models of the cables and predicting output from HFCTs some distance away. Implementation of the method is illustrated using an 11 kV XLPE cable. Moreover, a "direct measurement" method to obtain original PD pulses as the excitation source waveform is presented. The modeling approach introduced here will facilitate studies on the relationship between measured PD signals and those excited at PD sources, which can potentially give useful insight into the basic mechanisms behind PD detection in cables.Index Terms--Finite-difference time-domain (FDTD), transfer functions, high frequency current transformer (HFCT), partial discharge (PD), power cables. [2017]102.

show abstract

“…Currently, researchers have designed many external and built-in UHF antennas based on IEC-62487 for online PD detection in transformers, generators, gas-insulation switches (GIS) and so on [12][13][14][15][16]. In order to improve the detection of partial discharge, some researchers, such as Albarracín, R. considers the influence of metal surroundings on UHF antenna [14].…”

Section: Introductionmentioning

confidence: 99%

“…To study the propagation characteristics of the UHF signal, researchers have adopted the finite-difference time-domain (FDTD) method to simulate the discharge signal. Considering that the size of the switchgear is too large and the computer memory cannot meet the requirement, researchers simplified the PD source to a uniformly hardwiring source, which leads to the minimum mesh size reaches one tenth of the wavelength λ [15,[17][18][19]. This provides a good method for studying the propagation of discharge signal in a wide area of space.…”

Section: Introductionmentioning

confidence: 99%

Study on the Propagation Characteristics of Partial Discharge in Switchgear Based on Near-Field to Far-Field Transformation

Yang

Gao

et al. 2018

Energies

View full text Add to dashboard Cite

Ultra-high frequency (UHF) electromagnetic (EM) signals generated by the partial discharge (PD) process of high-voltage equipment are now widely used in PD detection. The computation of EM propagation generated by a local discharge source using a uniformly hardwiring source can hardly reveal the discharge characteristics. In this paper, a method of near-field to far-field transformation is proposed to realize the study of the propagation characteristics of the PD signal. A short gap discharge model is established to get the near-field electromagnetics and the proposed method is validated by comparing the directly calculated results with the results of the near-field source. In the end, a model of switchgear is employed to study the propagation characteristics of the EM signal based on the proposed method. Via numerical calculation, the influence of the equipment in the switchgear on the propagation of the discharge EM is studied. It is found that the direction of the discharge source has a significant effect on the distribution of the electric field, which indicates that the discharge source cannot be simplified to a uniformly hardwiring source. In addition, it is also obtained that the amplitude of the electric field shows the same trend with the growth of the discharge channel, which gives a method for evaluating the development of the PD. Particularly, the near-field to far-field transformation can provide an effective method for studying the propagation of discharge EM waves in large-scale equipment.

show abstract

Design and Optimization of UHF Partial Discharge Sensors using FDTD Modeling

Cited by 33 publications

References 8 publications

On the Feasibility of Gap Detection of Power Transformer Partial Discharge UHF Signals: Gap Propagation Characteristics of Electromagnetic Waves

On the Feasibility of Gap Detection of Power Transformer Partial Discharge UHF Signals: Gap Propagation Characteristics of Electromagnetic Waves

Modeling of High-Frequency Current Transformer Based Partial Discharge Detection in High-Voltage Cables

Study on the Propagation Characteristics of Partial Discharge in Switchgear Based on Near-Field to Far-Field Transformation

Contact Info

Product

Resources

About