Partial discharge diagnosis method using electromagnetic wave mode transformation in actual GIS structure

Kaneko, Shuhei; Okabe, Shigemitsu; Yoshimura, Manabu; Muto, Hirotaka; Nishida, C.; Kamei, Mitsuhito

doi:10.1109/tdei.2008.4656241

Cited by 21 publications

(16 citation statements)

References 10 publications

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“…In order to provide the basic data for on-site or on-line application of a loop sensor, experiments were conducted on 66kV GIS model (SF 6 , 0.15 MPa). Experimental circuit is shown in Figure 5.…”

Section: Experimental Setup For Partial Discharge Measurementsmentioning

confidence: 99%

“…The PD occurrence is an indication of GIS abnormality. Partial discharge (PD) detection is the most effective method to monitor and diagnose the insulation condition of high voltage apparatus [1][2][3][4][5][6][7][8]. PD detection method is of importance among the various diagnostic techniques, since it is non-destructive, non-intrusive and can qualitatively describe the integrity of insulation system.One of the promising PD diagnostic techniques is the ultrahigh frequency (UHF) electromagnetic wave detection method that has been widely used for measuring insulation performance in gas-insulated switchgear (GIS) due to its advantageous characteristics, such as high sensitivity, wide detection range and less external disturbances [9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characteristics of External Loop Sensor Located Near Bushing on Partial Discharge Induced Electromagnetic Wave Measurement

Sriyono¹,

Kim

Khayam

et al. 2013

ijeei

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For transmitting a huge electrical energy, high voltage transmission systems are commonly operated. Due to high reliability and less space required, gas insulated substation (GIS) are widely used. In a defect experienced GIS, partial discharge (PD) usually takes place. Partial discharge (PD) monitoring technique using UHF method becomes more popular because of its higher signal to noise (S/N) ratio. Amongst novel sensors, loop sensor could be a candidate for PD detector to measure UHF signal emitted from PD source. This paper presents the experiment results on characteristics of loop sensors. The characteristics of three loop sensors with varying diameter were examined using a spectrum analyzer and a network analyzer to obtain frequency characteristic and optimum operating frequency (S11) parameter, respectively. Then, PD experiment was conducted on 66kV GIS model having floating electrode and free metallic particles as its PD source. The loop sensors were placed far external to GIS bushing to measure leaked PD signal from it. The influences of the sensor diameter and the sensor distance from GIS bushing on PD detection sensitivity were also examined. Based on IEC-60270 standard measurement, the highest sensitivity of 30 pC was obtained from this investigation. The result suggests that higher sensitivity could be achieved with proper shielding and suitable filter design against external noise.

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Section: Experimental Setup For Partial Discharge Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characteristics of External Loop Sensor Located Near Bushing on Partial Discharge Induced Electromagnetic Wave Measurement

Sriyono¹,

Kim

Khayam

et al. 2013

ijeei

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“…TE mode refers to the case when there is only magnetic field propagation along the direction of the EM wave but no electric field propagation on this direction, while TM mode refers to the case when electric field propagates along the EM travelling direction but not magnetic field. The high order mode component has its cutoff frequency, which is associated with the size of the GIS structure [9][10]. The PD source excites various modes of EM signals, the attenuation properties of which differs greatly [11].…”

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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“…Firstly, with regard to the PD phenomenon, Section 2 presents the detailed observation results of the PD current of the discharge in gas up to a high frequency band exceeding 10 GHz [15], as well as the study results of the insulation characteristics where micro-defects are present inside the epoxy insulator [16], the detectability of the UHF method with respect to the length of harmful particles inside GIS [17], and both experimental and numerical approaches on propagation phenomena of PD signal in GIS [18]. Subsequently, with regard to further refinement of the diagnostic technique and the calibration and verification method, Section 3 describes a new less uncertain and inexpensive UHF sensor calibration system using a conical antenna [19,20] and a more advanced UHF diagnostic technology whereby the influence of the shape and structures of GIS on PD signal propagation is taken into consideration [21,22], as well as a UHF measurement system sensitivity verification method on the site using a network analyzer [23] to substitute the CIGRE method [13], and the novel technique for PD and breakdown investigation based on current pulse waveform analysis [24].…”

Section: Introductionmentioning

confidence: 99%

New aspects of UHF PD diagnostics on gas-insulated systems

Okabe

Ueta

Hama

et al. 2014

IEEE Trans. Dielect. Electr. Insul.

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Gas insulated switchgears (GIS) have been increasingly introduced as main substationequipment since the late 1960s thanks to their high reliability, safety, and compactness. The UHF method to diagnose partial discharge (PD) is broadly employed in the field as an advanced insulation diagnostic technology. There are three primary factors related to the PD signal detection characteristics using this UHF method; namely the frequency spectrum of the PD signal itself inside GIS, the propagation characteristics of the PD signal inside the GIS tank, and the detection characteristics of the sensor measuring the PD signal. Accordingly, to further improvement of the diagnostic technique based on the UHF method, the PD phenomenon itself and its propagation characteristics should be clarified and the measurement system refined. From these perspectives, the present study reviewed the recent and latest findings concerning the PD phenomenon and its propagation characteristics inside GIS as well as the PD measurement system verification methods and diagnostic technologies, and summarized typical examples. Firstly, with regard to the PD phenomenon, measurement up to the high frequency band exceeding 10 GHz (even 30 GHz) clarified that the rise time of the PD current waveform is several tens of picoseconds, shorter than previously known. In the case of PD in micro-defects inside the epoxy insulator, however, the rise time is relatively long, in the order of nanoseconds, and a crack is the most critical defect. Subsequently, with regard to UHF PD diagnostics/monitoring technology, a novel technique using PD current waveform characteristics has been developed, and a more advanced PD diagnostic algorithm has been established by clarifying the influence of the shape and GIS internal structures on the electromagnetic wave propagation characteristics. Less uncertain and simplified calibration and verification technologies are also proposed both for a single UHF sensor and the entire UHF measurement system. These new technologies and further advanced studies in future are expected to make the UHF method more convenient and sophisticated.

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Partial discharge diagnosis method using electromagnetic wave mode transformation in actual GIS structure

Cited by 21 publications

References 10 publications

Characteristics of External Loop Sensor Located Near Bushing on Partial Discharge Induced Electromagnetic Wave Measurement

Characteristics of External Loop Sensor Located Near Bushing on Partial Discharge Induced Electromagnetic Wave Measurement

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

New aspects of UHF PD diagnostics on gas-insulated systems

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