Installation and Test Run of Comprehensive Analysis System for SF 6 in Power Equipment

• Published in: KEPCO Journal on electric power and energy Vol. 3; no. 1; pp. 41 - 47
• Main Authors: Lee, Jeong Eun, Kim, Kwang Sin, Kim, Ah Reum, Park, Seoksoon, Kim, Kyeongsook
• Format: Journal Article
• Language: Korean
• Published: 2017
• Subjects: SF_6$ Analysis; SF_6$ Refinement; FT-IR; Gas Insulated Switchgears (GIS); Gas Chromatography
• ISSN: 2465-8111; 2466-0124

After $SF_6$, which is being used in power equipment as an insulating material, is classified as one of the 6 major greenhouse gases, the maintenance and the refinement of used $SF_6$ started to get attention. In regard to this, KEPCO Research Institute (KEPRI) is developing $SF_6$ recovery and refinement technology starting with establishing a comprehensive $SF_6$ analysis system. With the analysis system, qualitative and quantitative analyses of the purity and the impurities of $SF_6$ before and after recovery, and before and after refinement have been carried out. The analysis system is comprised of GC-DID (Gas Chromatograph -Discharge Ionization Detector) for trace impurities analysis, GC-TCD (Thermal Conductivity Detector) for analyses of $SF_6$ purity and major impurities concentration from several hundred ppm up to percent range, GC-MSD (Mass Selective Detector) for analyses of impurities not included in standard gas, FT-IR (Fourier Transform-Infrared) Spectrometer for analysis of HF and $SO_2$, and moisture analyzer for analysis of moisture below 100 ppm. With this analysis system, complete analysis method of $SF_6$ has been established. This analysis system is being used in the maintenance of power equipment and the development of $SF_6$ recovery and refinement technologies. In this paper, the analysis results of four samples - gas and liquid phase $SF_6$ samples from a $SF_6$ refinement system before and after refinement are presented.