Propagation properties of PD-induced electromagnetic wave in 66 kV GIS model tank with L branch structure

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

doi:10.1109/tdei.2011.6032839

Cited by 42 publications

(23 citation statements)

References 7 publications

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“…As a second step, the authors examined the effects of the turnoff part of GIS on the transmission characteristics of PD-induced EM wave using a model GIS with an L-shaped branch [10]. In this paper, attention is paid to the disconnecting part in GIS such as a circuit breaker or a disconnector as an impedance discontinuity part.…”

Section: Introductionmentioning

confidence: 99%

Influence of disconnecting part on propagation properties of PD-induced electromagnetic wave in model gis

Hikita

Ohtsuka

Okabe

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

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Partial discharge (PD) detection using a UHF (ultra high frequency) band signal is a well known advanced insulation diagnosis method in gas insulated switchgear (GIS), and has been actively studied. Detailed investigation of electromagnetic (EM) wave propagation inside the GIS tank is required for significant improvement of detecting PD signal by UHF method. When practically applying the UHF method to GIS insulation diagnostics, it is necessary to examine the effects of GIS components such as circuit breakers, isolators and disconnectors on EM wave propagation properties. In this paper, attention is paid to the effects of a disconnecting part of a high voltage (HV) conductor like a circuit breaker or a disconnector in GIS.To examine the effects of disconnecting part, the gap length of the disconnecting part was set as parameter, and waveforms and frequency spectra of the propagation PD-induced EM wave were measured with UHF sensors. For the purpose of discussing the effects of the disconnecting part theoretically, a finite difference time domain (FD-TD) simulation was also carried out. The experimental results show that the PD-induced wave could propagate through the disconnecting part with higher frequency components over the cutoff frequency components of TE11 mode for disconnecting part, i.e. cylindrical shape formed by GIS tank without HV conductor. The propagation of the lower frequency components below the TE11 mode depended on the gap length of the disconnecting part.Index Terms -Gas insulated switchgear (GIS), partial discharge (PD), electromagnetic (EM) wave, UHF (ultra high frequency) method, TE11 mode, cutoff frequency, insulation diagnosis, disconnecting part, finite difference time domain (FD-TD).

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Section: Introductionmentioning

confidence: 99%

Influence of disconnecting part on propagation properties of PD-induced electromagnetic wave in model gis

Hikita

Ohtsuka

Okabe

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

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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%

“…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

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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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“…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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Propagation properties of PD-induced electromagnetic wave in 66 kV GIS model tank with L branch structure

Cited by 42 publications

References 7 publications

Influence of disconnecting part on propagation properties of PD-induced electromagnetic wave in model gis

Influence of disconnecting part on propagation properties of PD-induced electromagnetic wave in model gis

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

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