[논문]Breakdown characteristics of SF6 and Imitation Air in Temperature Decline

Lim, Chang-Ho; Choi, Eun-Hyeok; Kim, Do-Seok; Kim, Young-Su; Park, Won-Zoo; Lee, Kwang-Sik

doi:10.5207/jieie.2007.21.4.115

[국내논문] Breakdown characteristics of SF6 and Imitation Air in Temperature Decline 원문보기

照明·電氣設備學會論文誌 = Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, v.21 no.4, 2007년, pp.115 - 121

Lim, Chang-Ho (Electrical Engineering from Yeungnam University) , Choi, Eun-Hyeok (Electrical Engineering from Yeungnam University) , Kim, Do-Seok (Electrical Engineering from Yeungnam University) , Kim, Young-Su (Electrical Engineering from Yeungnam University) , Park, Won-Zoo (Electrical Engineering Department of Yeungnam University) , Lee, Kwang-Sik (The Korean Institute of Illumination and Electrical Installation Engineers)

Abstract ▼ AI-Helper

This paper describes experiments of the breakdown characteristics by temperature change of $SF_6$ gas and Imitation Air(I-Air) in model GIS(Gas Insulated Switchgear). From the results of the experiments, the breakdown characteristics classify the vapor stage of $SF_6$ according to Paschen's law, in which the stage of coexistence for gas & liquid of the voltage value increases. This results in large deviation and the breakdown of the voltage(VB) low stage as the interior of the chamber is filled with a mixture of $SF_6$ that is not liquefacted and remaining air that can not be ventilated. The ability of $SF_6$ liquid($LSF_6$) insulation is higher than high-pressurize $SF_6$ gas. The VB of the I-Air decreases as the temperature drops and the VB also drops. It is considered that the results of this paper are fundamental data for the electric insulation design of superconductor and cryogenic equipment that will be studied and developed in the future.

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제안 방법

The purpose of this study is to provide data on designing insulation for p* owa equipment by investigating the insulation charactaistics of SFe and I-Air according to changes in pressure and temperature when there are certain amounts of gas in the chamber.
This study researched the phase transition characteristics, the temperature-pressure characteristics of SF& and the temperature thereof according to the fixed amount of the gas-pressure VB characteristics of Imitation —Air.

대상 데이터

A window(diameter, 110[mm]; thickness, 20[mm]) was installed to allow the observation of the temperature sensor and the 인ectrode installed inside the experimental chamber. The material for this window was transparent acrylic and was installed in a cylindrically-shaped space.
The electrode used was a Needle-Plane electrode(upper part- Needle; lower part: Plane, N-P; Needle; Diameter, 50[mm] angle of a 20°point; Plane: Diameter, 590[mm]) and the distance between electrodes was set to 30[mm]. The temperature of the temperature sensor section was lowered up to 30—40[°C] in the case of each atmospheric pressure after ventilating the inner chamber up to -68[cmHg] and inserting 4, 5 or 6[atm] before adding the SFe and I-Air.

참고문헌 (9)

Landry, M. et al, 'Dielectric withstand and breaking capacity of $SF_6$ circuit breakers at low temperatures', Power Delivery, IEEE Transactions on, pp. 1029-1035, July 1988
Gong Guoli et al. 'The influence of $SF_6\;and\;SF_6/N_2$ dissociating products on the electrical performance of several insulating varnishes', Electrical Insulating Materials, pp. 495-497, 1995
T. Ueda et al. 'Discrimination of Partial Discharge Electromagnetic Signal in $SF_6$ Gas from External Noise Using Phase Gate Control Method', IEEE International Symposium on Electrical Insulation, pp. 117-120, 1996
Kwang-Sik Lee, 'A Study on the discharge characteristics of liquid nitrogen at atmospheric pressure', KIEE Vol. 45, No.7, 1996.7
C.Beyer et al .'Influence Reactive SFX Gases on Electrode Surfaces after Electrical Discharge under $SF_6$ Atmosphere', IEEE Trans, pp. 234-240, 2001
Kwang-Sik Lee, 'A Study on the Discharge Characteristics of Liquid Nitrogen and Gases at Very Low Temperature', KEPCO, 1993.8
Kyeung-Tae Park, 'The Characteristics of Discharge and Radiated Electromagnetic Waves with a Variation of Temperature in $SF_6$ ', Yeungnam Univ. , 2002.12
Kwang-Sik Lee, 'The Characteristics of Insulation with Temperature Variations of $SF_6$ 'KIEE Vol. 52C, No.8, 2003.8
Kwang-Sik Lee, Eun-Hyuck Choi, 'The Positive Effect and the Breakdown Characteristics in $SF_6\;and\;LN_2$ ', KIEE Vol.54C, No.8, 2005, 8

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