Propagation properties of PD-induced electromagnetic wave in GIS model tank with T branch structure

Hikita, Masayuki; Ohtsuka, Shinya; Wada, Junichi; Okabe, Shigemitsu; Hoshino, T.; Maruyama, S.

doi:10.1109/tdei.2011.5704517

Cited by 33 publications

(22 citation statements)

References 7 publications

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“…Experimental setup and procedure are same as before [1][2][3][4][5][6].Figure1 shows the configuration of the experimental setup. Three sensors of UHF-A, UHF-B, and UHF-C have been installed with insulating spacers of the metal flange type.…”

Section: A Experiments Methodsmentioning

confidence: 99%

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Effect of excitation current waveform on PD induced electromagnetic wave propagation and attenuation in straight 154 kV GIS model tank with epoxy spacers

Nishigouchi

Kozako

Hikita

et al. 2012

2012 IEEE International Conference on Condition Monitoring and Diagnosis

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This paper deals with effect of excitation current waveform on PD induced electromagnetic wave propagation and attenuation in straight 154 kV GIS model tank with epoxy spacers. An attempt was made to determine a standard wave shape of experimentally obtained EM wave for the simulated ones obtained by changing the rise time t r of the excitation waveform of Gaussian pulse from 25 ps to 200 ps with the propagation attenuation in GIS considered. This comparison was performed in terms of both transmission rate T v of peak to peak value V pp of EM wave intensity and transmission rate T w of accumulated energy of the EM wave. The simulation revealed that as t r is shortened, both T v and T w decrease. As a result, it was found that simulated excitation pulse with the rise time of 25-50 ps allows the best fit to experimentally obtained T v and T w when the calculation was made for a straight GIS structure with two epoxy spacers for a free metal particle on the tank. Furthermore, the rise time of 25-50 ps for T v and 100-150 ps for T w was found to give the best fit to the experimental results for a protrusion on the high voltage conductor.

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Section: A Experiments Methodsmentioning

confidence: 99%

“…In recent years, diagnosis of the electrical insulation of electric power apparatus such as gas-insulated switches (GIS) and transformers by UHF method for detecting partial discharges (PD) has been widely examined [1][2][3][4]. The UHF method allows detection of radiated electromagnetic (EM) waves in UHF band caused with partial PD.…”

Section: Introductionmentioning

confidence: 99%

Effect of excitation current waveform on PD induced electromagnetic wave propagation and attenuation in straight 154 kV GIS model tank with epoxy spacers

Nishigouchi

Kozako

Hikita

et al. 2012

2012 IEEE International Conference on Condition Monitoring and Diagnosis

Self Cite

View full text Add to dashboard Cite

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“…The travelling of EM waves in GIS would encounter multiple reflection and mode transformations, which result in complicated processes [12][13][14][15]. Some research tasks have been done by both simulation and experiment tests in time domain through typical GIS structures such as basin-type insulators, L-shaped and T-shaped branches [16][17][18][19]. The deficiency of these research tasks is that they only concentrated on time domain variance while paid little attention to frequency spectrum analysis.…”

Section: Introductionmentioning

confidence: 99%

Investigation of frequency characteristics of typical PD and the propagation properties in GIS

Gao

Zhao

Ding³

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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The secure operation of Gas Insulated Switchgear (GIS) is crucial for the bulk power systems, since the failure of GIS apparatus would cause severe interruption of power transforming and power supply at substations. Therefore, the monitoring and maintenance schemes of GIS devices have gradually taken the reliability-based indices into account, of which Partial Discharge (PD) levels in online monitoring are of substantial significance because PD serves as a major cause of insulation break-down. Ultra High Frequency (UHF) method is becoming widely adopted as the major inspection approach for PD in GIS. This paper presents the experiment-based results of the frequency characteristics of UHF signals caused by PD in typical defects using entire GIS operating system platforms. Specifically, the results covered the propagation attenuation of the UHF signals with peak to peak value and cumulative energy through typical structures, including basin-type insulators, Lshaped branch, isolating switches, current transformers, etc. The results serve as substantial criteria for optimal band width selection for high frequency detection, and as notable concerns to improve the sensitivity of UHF detection and the efficiency of online monitoring by effectively locating the external sensors for PD UHF detection.

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“…RESEARCH on insulation diagnosis of electric power apparatus such as gas-insulated switchgears (GIS) and transformers by detecting partial discharge (PD) signals, especially the ultra-high frequency (UHF) signal has been conducted recently [1][2][3][4][5][6][7][8][9][10][11][12] with the electromagnetic (EM) wave propagation mode characteristics considered. In the application of UHF method for GIS insulation diagnostics, it is necessary to investigate the effects of the structure and components of GIS such as turnoff part and a spacer on the Manuscript EM wave propagation in GIS.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is important for reliable diagnosis technique to clarify TE and TEM mode propagation characteristics at the impedance discontinuity part in GIS. So far, EM wave propagation characteristics on several GIS structures have been investigated [9][10][11][12][13][14]. It is useful for improvement PD diagnosis technology such as decrease the number of sensor and increase the accuracy of determining of PD location.…”

Section: Introductionmentioning

confidence: 99%

Effect of the presence of epoxy spacer on transmission rate of electromagnetic wave propagating through T-branch of 66 kV GIS model tank

Khayam

Kozako

Hikita

et al. 2013

IEEE Trans. Dielect. Electr. Insul.

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This paper deals with the influence of the presence of the epoxy spacer on the transmission rate of partial discharge (PD) induced electromagnetic (EM) wave propagating through TBranch of 66 kV GIS model tank. The partial discharge sources are a particle on the conductor and a free particle on the tank. PD induced EM wave was measured by ultrahigh frequency (UHF) sensors and observed by the oscilloscope and the spectrum analyzer. A low pass filtering (LPF) process for the cut off frequency of TE11 mode was used to eliminate the higher order mode above TE11 of the detected signal. In addition, a high pass filtering (HPF) process for the cut-off frequency of TE11 mode was used to eliminate the lower frequency component below TE11 of the detected signal. We discussed the effects of the T-branch and the effect of the presence of the epoxy spacer on the peak to peak amplitude V pp of the propagating EM wave before and after the LPF and HPF processing. We compared the transmission rate (TR) of the propagating EM wave before and after LPF and HPF processing through T-branch in straight direction (TRS) with TR of EM wave before and after the LPF and HPF processing turning at a right angle at the T-branch (TRT) in the presence and in the absence of the epoxy spacer. The results showed that the transmission rate (TR) of EM wave in the presence of the spacer was generally lower than one without spacer. TR of a particle on the conductor was higher than TR of a particle on the tank. TRT was larger than TRS. It was found that TR of low frequency component (TRLF) of EM wave signal was higher than TR of high frequency component (TRHF) with and without epoxy spacer.

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Propagation properties of PD-induced electromagnetic wave in GIS model tank with T branch structure

Cited by 33 publications

References 7 publications

Effect of excitation current waveform on PD induced electromagnetic wave propagation and attenuation in straight 154 kV GIS model tank with epoxy spacers

Effect of excitation current waveform on PD induced electromagnetic wave propagation and attenuation in straight 154 kV GIS model tank with epoxy spacers

Investigation of frequency characteristics of typical PD and the propagation properties in GIS

Effect of the presence of epoxy spacer on transmission rate of electromagnetic wave propagating through T-branch of 66 kV GIS model tank

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