Generation Mechanism of Partial Discharge in Different Kind of Pure Gases and Gas Mixtures with SF6
SF6 is widely used in electric power apparatus such as gas insulated switchgears (GIS), not only because of its superior dielectric properties, but also its chemically inert and nontoxic characteristics.1,2 However, it has several weak points; firstly, it has high liquified temperature. Secondly, its dielectric strength is drastically reduced by concentration of the electric field on insulation defects like metallic particles. Moreover, SF6 is the gas with high greenhouse effect. From these reasons, the development of new gas or gas mixture for the electrical insulation alternative to SF6 are strongly required and recently studied.2-4 Much studies on gas mixtures are done for breakdown characteristics under lightning impulse voltage application,5,6 while few study on partial discharge (PD) characteristics in gas mixtures are reported.
KeywordsToxicity Dioxide Kato
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- 1.S. Okabe, et al., Recent Development in Diagnostic Techniques for Substation Equipment, CIGRE, Session Paper 15/21/33-08, (1996).Google Scholar
- 3.K. Mardikyan, et al., AC Breakdown Strength of N2 SF6, and a Mixture of N2+SF6 Containing a Small Amount of SF6, 1996 IEEE Int. Symp. on Elect. Insul., June 16–19 Vol. 2, pp. 763–765, (1996).Google Scholar
- 4.Y. Qiu, et al., Investigation of SF6-N2, SF6-CO2 and SF6-Air as Substitutes for SF6 Insulation, 7996 IEEE Int. Symp. on Elect. Insul., Vol. 2, pp. 766–769, (1996).Google Scholar
- 5.H. L. Marsden, et al., High Voltage Performance of a Gas Insulated Cable with N2 and N2/SF6 Mixtures, 10th Int. Symp. on High Voltage Eng., Vol. 2, pp 9–12, (1997).Google Scholar
- 6.T. B. Diarra, et al., N2-SF6 Mixtures For High Voltage Gas Insulated Lines, 10th Int. Symp. on High Voltage Eng., Vol. 2, pp 105–108, (1997).Google Scholar
- 7.T. Kato, et al., Breakdown Prediction in SR Gas Viewed from Transition of Partial Discharge Characteristics, 11th Int. Conf. on Gas Dis. and Their Appl., pp. 1-280-283, (1995).Google Scholar
- 8.M. Hikita, et al., Phase Dependence of Partial Discharge Current Pulse Waveform and its Freqency Characteristics in SF6 Gas, IEEE Int. Symp. on Elect. Insul., pp. 103-106, (1996).Google Scholar
- 9.H. Okubo, et al., Discrimination of Partial Discharge Type in SF6 Gas by Simultaneous Measurement of Current Waveform and Light Emission, IEEE Int. Symp. on Elect. Insul., pp. 107-110, (1996).Google Scholar
- 12.Th. Aschwanden, Swarm Parameters in SF6/N2 Mixtures Determined from a Time Resolved Discharge Study, Gaseous Dielectrics IV, pp. 24-33, (1984).Google Scholar
- 13.Y. Qiu, et al., Dielectric Strength of SF6/CO2, Gas Mixture in Different Electric Fields, Proc. 9th Int. Symp. on High Voltage Engineering, Vol. S2, paper 2255, (1995).Google Scholar
- 15.I. Gallimberti, Breakdown Mechanisms in Electronegative Gases, Gaseous Dielectrics V, pp. 61-80, (1987).Google Scholar