Reduce the use of SF6 gas to meet environmental requirements, to solve the problem of SF6 high voltage electrical equipment operating reliably at ultra-low temperature, SF6/N2 gas mixture is used as insulation or arc extinguishing medium, development of electric equipment for SF6/N2 gas mixture. Similarly, the higher the density of the SF6/N2 gas mixture in electrical equipment, the more insulated or arc-extinguishing it is. It is necessary to monitor the gas density, and also urgent to develop SF6/N2 mixed gas density relay to solve the problem of SF6 high voltage electrical equipment operating reliably at low temperature and ensure the safe operation of mixed gas high voltage electrical equipment. And it can achieve a better effect of energy saving and emission reduction. The higher the SF6 proportion under the same pressure, the stronger insulation capacity is. Therefore, it is necessary to develop SF6/N2 mixed gas density relay, this paper presents the development of high performance SF6/N2 mixed gas density relay, the realization method of high performance SF6/N2 mixed gas density relay is described. And Pass the performance test, It is proved that the SF6/N2 mixed gas density relay has good performance.
As SF6 mixture gas gradually replaces pure SF6 gas as insulation gas for switch equipment, the decomposition products of SF6 mixture gas such as Quantitative analysis have been put on the agenda. Although SF6 gas mixture is similar to high purity SF6 in physical chemistry characteristics, there are great differences in decomposition product gas analysis algorithms. If we still use high purity SF6 gas decomposition product detection equipment and algorithms, the result will cause the quite big measurement error, can not satisfy the measurement precision request. The Gas chromatography can be used for quantitative and qualitative analysis of the characteristic gas components of the decomposition products by valve switching, selection of supports, and optimization of chromatographic conditions. The Sulfur hexafluoride Gas chromatography enables the detection of decomposition products of Sulfur hexafluoride gas mixtures under laboratory and field conditions. It is convenient to find and deal with the defect and hidden trouble of the equipment, and carry on the comprehensive condition evaluation. This can not only ensure safe and stable operation, but also provide technical support for power grid construction.
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