Insulation characteristics of GIS insulators under lightning impulse with DC voltage superimposed

Okabe, Shigemitsu; Ueta, Genyo; Utsumi, Tomoaki; Nukaga, Jun

doi:10.1109/tdei.2015.005178

Cited by 37 publications

(17 citation statements)

References 10 publications

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“…Many attempts have been proposed to optimize the shape of dielectric spacers to reduce the electric field stress and thus, increase the breakdown voltage of GIS. Consequently, different types of insulations are proposed including but not limited to disk-type, cone-type, and basin-type spacers [68], [71].…”

Section: E Insulating Spacersmentioning

confidence: 99%

On the Electromagnetic Wave Behavior Due to Partial Discharge in Gas Insulated Switchgears: State-of-Art Review

et al. 2019

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The rapid growth of gas insulated switchgears as a compact, efficient, and reliable device has recently been given great attention. Albeit gas insulated switchgears can seldom suffer from failure due to the high resiliency and robustness, some severe damages have been experienced by such devices particularly in the event of partial discharge. Thus, monitoring such accidents has become a vital part of power systems reliability. The ultra-high frequency techniques have recently shown superior performance in the detection and classification of electromagnetic waves produced by partial discharge. This is mainly due to the great immunity to the noise of the ultra-high frequency detection techniques compared with the veryhigh-frequency counterparts. This review paper highlights the mathematical aspects of the electromagnetic waves generated by partial discharge. It also delivers an overview of the electromagnetic wave behavior in the complex structure of gas insulated switchgears, and outlines the important characteristics of the internal and external partial discharge detection using ultra-high frequency methods. INDEX TERMS Electromagnetic waves behavior, finite difference time domain, gas insulated switchgears, partial discharge, sensors, ultra-high frequency measurements.

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Section: E Insulating Spacersmentioning

confidence: 99%

On the Electromagnetic Wave Behavior Due to Partial Discharge in Gas Insulated Switchgears: State-of-Art Review

et al. 2019

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“…3a shows that the Al 2 O 3 diameter has a large variation from 1 to 60 µm. According to (5), the larger particles should have larger settling velocity than the smaller ones. Fig.…”

Section: Al 2 O 3 Settlementmentioning

confidence: 99%

“…Gas insulated switchgear (GIS) and gas insulated line (GIL) have been widely used in electric power system because of its high reliability and low footprint [1][2][3][4][5]. The GIS insulator is made of epoxy (EP)/aluminium oxide (Al 2 O 3 ) composites that play the role of insulation and support in GIS.…”

Section: Introductionmentioning

confidence: 99%

Mechanical stress distribution and risk assessment of 110 kV GIS insulator considering Al ₂ O ₃ settlement

Wang

2019

High Voltage

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The growing application of gas insulated switchgear (GIS) in electric power system asks for higher reliability of epoxy (EP) insulators, thus it is important to seek effective methods to improve the operating reliability of GIS insulators. On the basis of the 110 kV GIS insulator, this study studied the aluminium oxide (Al 2 O 3) settlement in the curing process and the stress distribution of the horizontally laid GIS. Besides, the risk coefficient was defined to evaluate the operating reliability of insulators laid by different methods (I-V). Some conclusions are shown below: the Al 2 O 3 settlement in the curing process causes the insulator density to have a large variation from 2.13 to 2.32 g/cm 3. The Al 2 O 3 content has a great influence on the mechanical performances of EP/Al 2 O 3 system. The first principle stress is localised on the upper interface between the insulator and the conductor, which is the main threat to the mechanical damage of insulator. The laying method V appears to be optimal with a pretty low risk coefficient of 31.5. In actual application, for the horizontally laid GIS, the insulator should be laid with the mould gate downward to improve its mechanical reliability.

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“…In addition, due to the influence of surface charges, flashover voltages of insulators under superimposed voltage of DC and impulse are different from those under impulse voltage alone and can cause breakdown of HVDC GIL. The research conducted by Okabe showed that flashover voltage of insulators would increase when polarities of DC and impulse voltage were the same and decrease when polarities of DC and impulse voltage were the opposite [17]. However, Hasegawa found that flashover voltage under superimposed voltage was the same as that under impulse alone [18].…”

Section: Introductionmentioning

confidence: 99%

Quantitative Analysis on the Influence of Surface Charges on Flashover of Insulators in SF₆

Tao

et al. 2021

IEEE Trans. Dielect. Electr. Insul.

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In this paper, the influence of surface charges is quantitatively analyzed based on the study of surface charge distribution under DC voltage and flashover characteristics of insulators under superimposed voltage of DC and lightning impulse. It is found that when DC and impulse voltage are in the same polarity, surface charges weaken the electric field along the insulator surface and flashover voltages under superimposed voltage increases. When DC and impulse are in the opposite polarity, surface charges enhance the electric field along the insulator surface, and flashover voltages will decrease. The calculation results of the electric field along the flashover path show that the changing rate of the maximum field strength is approximately equal to the changing rate of flashover voltage, which proves that the influence of surface charges on flashover characteristics of insulators mainly depends on their distortion of the electric field.

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Insulation characteristics of GIS insulators under lightning impulse with DC voltage superimposed

Cited by 37 publications

References 10 publications

On the Electromagnetic Wave Behavior Due to Partial Discharge in Gas Insulated Switchgears: State-of-Art Review

On the Electromagnetic Wave Behavior Due to Partial Discharge in Gas Insulated Switchgears: State-of-Art Review

Mechanical stress distribution and risk assessment of 110 kV GIS insulator considering Al ₂ O ₃ settlement

Quantitative Analysis on the Influence of Surface Charges on Flashover of Insulators in SF₆

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Insulation characteristics of GIS insulators under lightning impulse with DC voltage superimposed

Cited by 37 publications

References 10 publications

On the Electromagnetic Wave Behavior Due to Partial Discharge in Gas Insulated Switchgears: State-of-Art Review

On the Electromagnetic Wave Behavior Due to Partial Discharge in Gas Insulated Switchgears: State-of-Art Review

Mechanical stress distribution and risk assessment of 110 kV GIS insulator considering Al 2 O 3 settlement

Quantitative Analysis on the Influence of Surface Charges on Flashover of Insulators in SF6

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Mechanical stress distribution and risk assessment of 110 kV GIS insulator considering Al ₂ O ₃ settlement

Quantitative Analysis on the Influence of Surface Charges on Flashover of Insulators in SF₆