Insulation integrity of GIS/GITL systems and management of particle contamination

Morcos, M.M.; Ward, Sayed A.; Anis, H.; Srivastava, K. D.; Gubanski, Stanislaw

doi:10.1109/57.871418

Cited by 47 publications

(14 citation statements)

References 61 publications

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“…Due to electrostatic charging phenomenon, a free metallic particle can move in the gas gap and finally adhere to the GIS insulating spacer surface, thereby creating a potential defect. As a consequence of such defects, partial discharges (PDs) can occur in the SF 6 insulated systems [4,5]. Such PDs are very dangerous to the integrity of the GIS equipment.…”

Section: Introductionmentioning

confidence: 99%

Partial discharge pattern analysis using support vector machine to estimate size and position of metallic particle adhering to spacer in GIS

Khan¹,

Khan²,

Budiman³

et al. 2014

Electric Power Systems Research

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Section: Introductionmentioning

confidence: 99%

Partial discharge pattern analysis using support vector machine to estimate size and position of metallic particle adhering to spacer in GIS

Khan¹,

Khan²,

Budiman³

et al. 2014

Electric Power Systems Research

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“…A large number of researches have been conducted in recent years to study the surface discharge caused by both immobilized metallic particles and free metallic particles. Much progress has been made in the fields of on-line/off-line defect detection, PD type recognition, PD location, and insulation structure refinement [5][6]. Comparatively, less report has been made on partial discharge triggered by the high-voltage electrode defects.…”

mentioning

confidence: 99%

Partial discharge severity diagnosis and assessment: a case of high-voltage electrode defect in GIS

Geng

et al. 2010

2010 International Conference on High Voltage Engineering and Application

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A major cause of insulation failure in GIS equipments is due to the high-voltage electrode defect, which usually occurs at the interface formed by metallic conductor, insulator and SF6. The present research is designed to diagnose and assess the severity levels of the partial discharge (PD) provoked by high-voltage electrode defect on GIS insulator surface. With the application of gradually increased voltage, long term tests were conducted on a well-established 252 kV GIS experiment platform to observe the entire evolution process of partial discharge from its very initiation till the eventual flashover. Real time measurement was also undertaken during the tests to capture the trend curve of partial discharge as a result of test time, the scatter plot, histogram, grey-scale map, and the time-frequency map of the partial discharge. The test results indicate that 1) partial discharge initiated by highvoltage electrode defects undergoes three elocutionary phases, namely, the inception phase, the developing phase and the threatening phase; 2) as partial discharge exacerbates, the phase distribution is widening and corresponding shape changes occur in the scatter plot, histogram, grey-scale map, the timefrequency map and the ultraviolet images. It is suggested that the features of phase distribution and the corresponding spectrums be used as important criterion in diagnosing and assessing the severity levels of the partial discharge triggered by high-voltage electrode defect on GIS insulator surface.

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“…Another technique investigated, and used by some manufactures, is to coat the inside surface of the enclosure with an insulating (dielectric) material, such as epoxy. Again, there is a lot of literature available on this subject [14]. The coating impedes the acquisition of charge by a particle resting on the coating and consequently the liftoff, crossing and breakdown voltages are considerably increased.…”

Section: Control and Management For Free Conducting Particlesmentioning

confidence: 99%

“…The physical processes through which the particle acquires charge at liftoff and at subsequent encounters with the enclosure are not fully understood. Both conduction through the coating and partial discharges between the particle and the coating are assumed to play a role [14].…”

Section: Control and Management For Free Conducting Particlesmentioning

confidence: 99%

“…Even with a very high level of quality control, it appears that a certain level of particulate contamination is unavoidable. There have been a large number of R & D investigations to understand the behavior of metallic contamination in GIS/GIL systems, and to develop ways of controlling and mitigating their deleterious effects [14].…”

Section: Control and Management For Free Conducting Particlesmentioning

confidence: 99%

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A review of some critical aspects of insulation design of GIS/GIL systems

Srivastava

Morcos²

2001 IEEE/PES Transmission and Distribution Conference and Exposition. Developing New Perspectives (Cat. No.01CH37294)

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The electrical power industry worldwide has some 35 years of manufacturing and field experience with compressed gas, SF 6 or SF 6 /N 2 mixtures, switchgear and transmission lines (GIS/GIL). Such equipment is in use for distribution as well as the highest transmission voltages, and a 1000 kV GIS is currently being tested and evaluated. Several power utility and manufacturing industry surveys, especially for GIS installations, and many of the areas of operation focus on insulation design of such systems. Amongst these there are at least two areas of insulation design that are considered critical, namely, metallic particle contamination and support spacer reliability. The management and control of particle contamination and quality assurance of spacers are crucial considerations as the industry moves forward to higher voltage GIS and long GIL designs using SF 6 in some components and SF 6 /N 2 mixtures in others. The paper reviews the current technology of particle control and quality assurance of support spacers. Partial discharge monitoring plays an important diagnostic role in ensuring insulation integrity of GIS/GIL installations.

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Insulation integrity of GIS/GITL systems and management of particle contamination

Cited by 47 publications

References 61 publications

Partial discharge pattern analysis using support vector machine to estimate size and position of metallic particle adhering to spacer in GIS

Partial discharge pattern analysis using support vector machine to estimate size and position of metallic particle adhering to spacer in GIS

Partial discharge severity diagnosis and assessment: a case of high-voltage electrode defect in GIS

A review of some critical aspects of insulation design of GIS/GIL systems

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