A Study of Surface Discharge Characteristics for Dew-Point of Dry-Air and Materials or Shapes of Solid Insulator in Quasi-Uniform Field

Min, Gyeong-Jun; Kang, Byoung-Chil; Lim, Dong-Young; Lee, Kwang-Sik; Park, Won-Zoo

doi:10.5207/jieie.2013.27.6.044

Cited by 2 publications

(4 citation statements)

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“…As a result, the flashover voltage (V S ) was highest in TE-TE-TE and lowest in BE-BE-BE. Thus, the surface discharge characteristics of the laminated solid insulator stack with an identical insulator were similar to that of the monolayer solid insulator if their thickness was equal [11]. Fig.…”

Section: Experimental Methodologymentioning

confidence: 73%

“…This is because the dielectric strength of dry air in contact with laminated solid insulator creepage increases with increasing pressure in the test chamber, and the flashover voltage increases due to the gas effect. This phenomenon appeared in the case of single solid insulator [11].…”

Section: Surface Discharge Characteristics On the Change Of Thicknessmentioning

confidence: 98%

“…The electric field depends on the permittivity of a solid insulator because the relative permittivity of a surrounding gas is approximately 1. The higher the permittivity of the solid insulator is, the stronger the electric field of the triple junction is, and the surface discharge occurs easily [11]. In this study, TE, PC, and BE were used as solid insulators in an identical layer of the laminated solid insulator stack.…”

Section: Experimental Methodologymentioning

confidence: 99%

“…The proposed method is able to solve the complexity and production cost of high voltage power devices. The relevant precedent study [11] explored the impact to surface discharge through different materials of solid insulators and dry air pressure. The changes in flashover voltage were measured as the different structures of the laminated solid insulators into which different levels of AC voltages were applied.…”

Section: Introductionmentioning

confidence: 99%

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Surface Discharge Characteristics Study on the Laminated Solid Insulator in Quasi-Uniform Electric Field with Dry Air

Min¹,

Bae²,

Kang³

et al. 2015

Journal of Electrical Engineering and Technology

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-Dry air is an excellent alternative to SF 6 gas and is used as an insulation gas in Ecofriendly Gas Insulated Switchgears (EGISs), which has gained popularity in industry. Solid insulators in EGIS play an important role in electrical insulation. On the other hand, surface discharge can occur easily when solid insulators are used. This paper explored the surface discharge characteristics on the structure of three-layered laminated solid insulators to elevate the flashover voltage. A laminated solid insulator was inserted after the quasi-uniform electric field was formed in the test chamber. Dry air was then injected to set the internal pressure to 1 ~ 6 atm, and the AC voltage was applied. When identical solid insulators were stacked, the surface discharge characteristics were similar to those of a single solid insulator. On the other hand, the flashover voltage rose when the middle part was thicker and had lower permittivity than the top and bottom parts in the laminated solid insulator. Based on experimental results, when stacking a solid insulator in three layers, the middle part of the solid insulator should be at least four times as thick as the top and bottom parts and have lower permittivity than the others. In addition, the flashover voltage increased with increasing gas pressure on the surface of the laminated solid insulator due to the gas effect. This study may allow insulation design engineers to have useful information when using dry air for the insulation gas where the surface discharge can occur.

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Section: Experimental Methodologymentioning

confidence: 73%

Section: Surface Discharge Characteristics On the Change Of Thicknessmentioning

confidence: 98%

Section: Experimental Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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