UHF PD detection in GIS substations during on-site testing

Schichler, Uwe; Gorablenkow, J.; Diessner, A.

doi:10.1049/cp:20000493

Cited by 20 publications

(5 citation statements)

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“…In contrast, methods that mainly detect frequencies in the UHF (ultra high frequency) band [5] (300 MHz to 3 GHz) are reliable in actual use because they are less influenced by noise from inverter control systems or power supply systems, whose frequencies are concentrated in the Hz to kHz band. A diagnostic technique that uses a UHF sensor is making rapid progress in such areas as defect type determination, where a statistical processing technique is used [6][7][8]. However, when this UHF method is practically applied 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 further detail.…”

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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“…As the detection method for a PD, study is being conducted on methods of detecting secondary physical phenomena such as electromagnetic waves (EM-waves), ultrasonic waves, light beams, and decomposed gases generated concurrently with a PD [1,2]. Among them, a PD detection method based on the detection of electromagnetic emission through measurement of the UHF band (300 MHz to 3 GHz) [3][4][5][6][7][8][9], which is relatively free of influences from external noises, enables extended and highly sensitive detection and is therefore undergoing active research as an effective method [10,11].…”

Section: Introductionmentioning

confidence: 99%

Examination of Electromagnetic Mode Propagation Characteristics in Straight and L-Section GIS Model Using FD-TD Analysis

Hikita

Ohtsuka

Teshima

et al. 2007

IEEE Trans. Dielect. Electr. Insul.

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It is an effective method of insulation accident prevention for gas-insulated switchgear (GIS) to detect a partial discharge (PD) that occurs as a preceding phenomenon for an insulation accident. Among various methods, a PD detection method based on the detection of electromagnetic emission through measurement of the UHF band (300 MHz to 3 GHz), which is relatively free of influences from external noises, is drawing attention as an effective method in terms of extensive and highly sensitive detection. This paper describes conducting EM-wave propagation analysis on GISs with L-sections using the Finite Difference-Time Domain (FD-TD) method and examining the influences of the Lsections on the propagation characteristics of EM-wave modes with comparison of straight GIS part. As a result, this study identified that, even on a straight GIS, the velocity dispersion characteristic of high-order modes resulted in a decrease in the crest value even if there is no reflection or conductor loss in the discontinuities. And that mode conversions and reflections in L-sections also resulted in a decrease in the crest value.Index Terms -Gas-insulated switchgear (GIS), partial discharge detection, electromagnetic wave propagation, FD-TD analysis, high-order mode.

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“…Meanwhile, the propagation characteristics of UHF signals in GIS will be effected by these components in GIS. At present, the propagation characteristics of UHF signals have been analysed by experimental measurements or simulation in many researches [5–11], which have considered the influence of insulator types [12, 13], different gap lengths of disconnectors [14], L‐section, T‐branch‐part [15–18], and so on. Most of the studies concentrate on PD‐induced UHF signals propagation characteristics in GIS under one voltage level, and are mainly about the axial direction quantities of PD‐induced UHF signals.…”

Section: Introductionmentioning

confidence: 99%

Effect of disconnector and high‐voltage conductor on propagation characteristics of PD‐induced UHF signals

et al. 2018

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UHF (ultra high frequency) method has been widely used in PD (partial discharge) detection for its high sensitivity. The resonance, distortion, and attenuation appearing in the propagation process of UHF signals in GIS (gas insulated switchgear) will influence the real situation of PD detection. Therefore, it is necessary to investigate the effect of GIS components such as disconnectors or high voltage conductors on the propagation characteristics of PD-induced UHF signals in various voltage classes GIS. The factors of PD signals propagation characteristics in axial and radial directions are both analysed to avoid the effect caused by placement of sensor in this paper. First, the simulation models of GIS are built based on FDTD (finite difference time domain) method. Then the propagation characteristics of PD-induced UHF signals are studied in the GIS with different disconnector gap lengths and different high voltage conductor radii. Finally, the reliability of the simulation results is verified by compared with laboratory tests. The disconnector gap and the change of conductor radii can both result in the signals attenuation which rises highest in the direction of 180°. The lower the GIS class voltage is, the larger the attenuation of signals after passing through disconnector gap is.

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UHF PD detection in GIS substations during on-site testing

Cited by 20 publications

References 0 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

Examination of Electromagnetic Mode Propagation Characteristics in Straight and L-Section GIS Model Using FD-TD Analysis

Effect of disconnector and high‐voltage conductor on propagation characteristics of PD‐induced UHF signals

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