Insulation co-ordination procedure for 420 kV gas insulated lines (GIL)

Sabot, A.

doi:10.1049/cp:19990686

Cited by 17 publications

(8 citation statements)

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“…Although the supporting insulators in GIS/GIL separate the high voltage and ground, the electric field distribution of coaxial cylindrical structure inside the apparatus was changed not to mention the presence of metal particles [1][2][3][4]. Therefore, operation experience of GIS/GIL demonstrates that the flashover of its supporting insulators is the most common failure [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Negative DC Flashover of PTFE and PE Insulators in Sf6

Jia¹,

Chen²,

Li³

et al. 2012

2012 Asia-Pacific Power and Energy Engineering Conference

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With the extensive application of high voltage power transformation and distribution apparatus such as GIS and GIL, the dielectric strength of interior supporting insulators become an important factor for equipments' safe and stable operation. In this paper, the cone-plane electrode assembly has been built to simulate the electric field distribution of the coaxial cylindrical configuration in GIS/GIL. Key factors that affect PTFE and PE insulators' flashover characteristics in SF 6 under DC voltage are investigated mainly from the view of the insulator's surface roughness and metal particles. Results show that the surface dielectric strength of umbrella insulators with smooth surface is fine whether the insulator is made of PTFE or PE. Moreover, whatever the metal particle adhered to insulator surface is near high voltage conductor or grounded enclosure, flashover voltages of the insulator are the lowest under relatively high pressures (≥0.3MPa) if the metal particle is positively charged.

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Section: Introductionmentioning

confidence: 99%

Negative DC Flashover of PTFE and PE Insulators in Sf6

Jia¹,

Chen²,

Li³

et al. 2012

2012 Asia-Pacific Power and Energy Engineering Conference

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“…The supporting insulator of GIL is made of the mixture of epoxy resin, filler and hardener, etc. Operation experience of GIL demonstrates that the flashover of its supporting insulators is the most common failure [5][6] .…”

Section: Introductionmentioning

confidence: 99%

“…E smax is the maximum field strength along surface of the solid insulator. E gmax is the maximum field strength in SF 6 gas. λ is a margin to correct for statistical spread of discharge voltages on the spacer surface.…”

Section: Introductionmentioning

confidence: 99%

Flashover Characteristics Along the Epoxy Resin Insulator under DC Voltage in SF6 Gas

Jia¹,

Liu²,

Li³

et al. 2012

2012 International Conference on Computer Distributed Control and Intelligent Environmental Monitoring

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In order to promote the flexibility about the selection of transmission corridor, DC gas insulated transmission line (GIL) can be utilized to substitute part of the overhead line or cable in special environment. Key factors that greatly threaten the insulation level of GIL are surface charge accumulation along the insulator surface and electric field distortion under DC voltage. In this paper, the cone-plane electrode assembly has been established to simulate the electric field distribution of the coaxial cylindrical configuration in GIL. Key factors that affect the insulator's flashover characteristics in SF6 gas under DC voltage are investigated mainly from the view of the filler and geometry of epoxy resin insulators. Results show that among epoxy resin insulators with no filler, alumina and silica, surface dielectric strength of silica filled insulators is the most excellent in both short-term flashover and long-term withstand voltage tests. Also, the attention points in optimizing cone-plane electrode assembly based epoxy resin insulator for DC GIL and the method to approximately acquire charging time constant of insulator have been put forward.

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“…The electric field around solid insulators is conventionally controlled by such techniques as built-in electrodes, regulation of the contact angle between insulators and electrodes at triple junctions (TJ), electric field relaxation electrodes, or special shape of the insulators [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Application feasibility of permittivity graded FGM (functionally graded materials) for gas‐insulated equipment

Shumiya

Katō

Ōkubo

2007

Electrical Engineering Japan

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SUMMARYFor the size reduction of electric power equipment, the electric field stress around solid insulators is to be carefully designed. This concern will be solved by the application of FGM (Functionally Graded Materials). In this paper, we investigated an application feasibility of FGM from numerical simulation, and the fabrication technique for gas insulated equipment. Finally, we could confirm the significant effect of FGM application for gas insulated equipment.

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Insulation co-ordination procedure for 420 kV gas insulated lines (GIL)

Cited by 17 publications

References 0 publications

Negative DC Flashover of PTFE and PE Insulators in Sf6

Negative DC Flashover of PTFE and PE Insulators in Sf6

Flashover Characteristics Along the Epoxy Resin Insulator under DC Voltage in SF6 Gas

Application feasibility of permittivity graded FGM (functionally graded materials) for gas‐insulated equipment

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