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

Min, Gyeong-Jun; Bae, Sungwoo; Kang, Byoung-Chil; Park, Won-Zoo

doi:10.5370/jeet.2015.10.2.603

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

Journal of electrical engineering & technology, v.10 no.2, 2015년, pp.603 - 609

Min, Gyeong-Jun (Dept. of Electrical Engineering, Yeungnam University) , Bae, Sungwoo (Dept. of Electrical Engineering, Yeungnam University) , Kang, Byoung-Chil (Dept. of Electrical Engineering, Yeungnam University) , Park, Won-Zoo (Dept. of Electrical Engineering, Yeungnam University)

Abstract ▼ AI-Helper

Dry air is an excellent alternative to $SF_6$ gas and is used as an insulation gas in Eco-friendly 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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문제 정의

This study examined the surface discharge characteristics of laminated solid insulators when dry air was used for an insulation gas in a quasi-uniform electric field. The findings obtained in this study are summarized as follows: (1) When an identical laminated solid insulator was stacked, the flashover voltage became higher if the laminated solid insulator had lower permittivity under the same pressure.

가설 설정

This is similar to the surface discharge characteristics of a single solid insulator. (2) When the thickness of each part was identical, the flashover voltage became higher if the permittivity of the middle part was lower than that of the top and bottom parts. (3) When the permittivity of the middle part was lower than that of the top and bottom parts, the flashover voltage increased if the middle part became thicker than the top and bottom parts.

제안 방법

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. Therefore, the electric field of the triple junction was highest in BE-BE-BE because BE has the highest permittivity, and the electric field of the triple junction was lowest in TE-TE-TE because TE has the lowest permittivity.
The experimented laminated solid insulator stacks were divided into three sample groups including groups A, B and C. Group A has an identical solid insulator to determine the impact on the flashover voltage. The order of insulation layers was TE-TE-TE, PC-PC-PC and BEBE-BE with a 1 mm thickness of each part.
This three-layered laminated solid insulator structure increased the dielectric strength without changing the spacer shape. 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.
gas in the experiment. This paper studied the surface discharge characteristics of three-layered laminated solid insulator structure which was proposed to increase the flashover voltage. These surface discharge characteristics of the laminated solid insulator were examined by changing the dry air pressure.

대상 데이터

A vacuum layer was placed between the inner and outer walls in order to block heat transfer. A quartz glass observation window of which diameter and thickness were respectively 110 mm and 20 mm was installed on the outside in order to observe the test chamber. This chamber could withstand the temperature range of -90℃~100℃ and 10 atm.
Its input specifications are single-phase 380V 60Hz, and its secondary side has single-phase 300kV 60Hz. Electrodes were made of stainless steel; the sphere electrode had a diameter of 41 mm, and the plate electrode had a diameter of 59 mm.
The specifications of the chamber interior were as follows: diameter 260 mm, height 460 mm, and approximate volume 25 ℓ. The chamber exterior had a diameter of 460 mm and height of 500 mm. A vacuum layer was placed between the inner and outer walls in order to block heat transfer.
Group B had a middle layer with different permittivity. The laminated orders of each solid insulator were TE-PC-TE, TE-BE-TE, PC-TE-PC, PC-BE-PC, BE-TE-BE, and BE-PC-BE with a 1 mm thickness of each sheet. Group C had a different thickness in the top, middle and bottom parts compared with the group B.
1 shows experimental equipment used in this study. The test chamber in Fig. 1 was made of 20 mm stainless steel in a dual structure composed of internal and external walls to observe the surface discharge characteristics. The specifications of the chamber interior were as follows: diameter 260 mm, height 460 mm, and approximate volume 25 ℓ.
Therefore, this paper presented stacking well-known laminated materials whose permittivity range is within that of spacer currently used in the GIS. These findings of this study can be applied to inexpensively fabricate a spacer composed of three layers with different permittivity distribution using well-known solid insulating materials.

참고문헌 (15)

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T. Rokunohe, Y. Yagihashi, K. Aoyagi, T. Oomori and F. Endo, “Development of SF 6 -Free 72.5 kV GIS,” IEEE Trans. Power Deliv., vol. 22, no. 3, pp. 1869-1876, Jul. 2007.

상세보기
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상세보기
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CIGRE WG 15.03: “Long-term performance of SF6 insulated systems,” CIGRE Report 15-301, 2002.
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상세보기
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상세보기
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상세보기
L. Shengtao, Z. Tuo, H. Qifeng, L. Weiwei, N. Fengyan and L. Jianying, “Improvement of Surface Flashover Performance of Al 2 O 3 Ceramics in Vacuum by Adopting A-B-A Insulation System,” Plasma Sci. and Tech., vol. 13, no. 1, pp. 235-241, Jan. 2011.

상세보기
G. Min, B. Kang, D. Lim, K. Lee and W. Park, “A Study of Surface Discharge Characteristics for Dew- Point of Dry-Air and Materials or Shapes of Solid Insulator in Quasi-Uniform Field,” J. Korean Inst. Illumi. Electr. Installa. Eng., vol. 27, no. 6, pp. 44-49, Jun. 2013.
J. R. Laghari, “Spacer Flashover in Compressed Gases,” IEEE Trans. Electr. Insul., vol. EI-20, no. 1, pp. 83-92, Feb. 1985.

상세보기
G. Min, B. Kang, S. Bae, K. Lee and W. Park, “Study of surface discharge characteristics for laminated solid insulator in quasi-uniform field of dry air,” in Proc. 2013 KIIEE Spring, Annu. Conf., pp. 27-28.
D. Lim, G. Min, H. Park, E. Choi, S. Choi, S. Bae, S. Rhee, W. Park, K. Lee, “Analysis of Medium Effect by gas Pressure and Gap at Surface Discharge of Dry Air,” J. Korean Inst. Illumi. Electr. Installa. Eng., vol. 27, no. 10, pp. 86-92, Oct. 2013.
H. Park, “Surface Discharge of Solid Dielectrics in Different Media,” M. S. thesis, Yeungnam University, Gyeongsan-si, Gyeongsangbuk-do, Korea, 2008.

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

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

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