不同绝缘气体下中压开关柜温升特性研究

Study on the Temperature Rise Characteristics of Mediumvoltage Switchgear withDifferent Insulating Gas

为探究干燥空气和N_(2)从温升角度替代SF_(6)气体的可能性,针对KYN2812型中压开关柜,通过有限元分析法,构建三维温度场流场的耦合模型,并在3种绝缘气体下,研究中压开关柜温升特性。研究结果表明,在3种绝缘气体下,具有相似的温度场分布,采用干燥空气和N_(2)开关柜的温升要高于SF_(6)气体,高出约5~9℃;3种气体中流场分布规律也基本一致,但SF_(6)气体流速较慢,最高0.12 m/s,干燥空气和N_(2)的流速类似,最高流速0.16 m/s。研究结果认为从温升方面考虑,满足绝缘条件下,干燥空气和N_(2)替代SF_(6)可行,但需要注意较SF_(6)更高的温升,流场分布特性可为干燥空气和N_(2)开关柜降低温升研究提供一定的理论依据。

To explore the possibility of replacing SF_(6) gas with dry air and N_(2) from the perspective of temperature rise,the coupling model of threedimensional temperature field flow(field coupling)was estublished by the finite element analysis for KYN2812 medium voltage switchgear.And the temperature rise characteristics of medium voltage switchgear under three kinds of insulating gases were studied,the results show that the temperature distribution with three insulating gases was similar.With using dry air and N_(2),the temperature rise of switchgear is higher than thta of SF9 gas about 5~9℃.The flow field distribution in the three gases is almost the same,but the flow velocity of SF_(6) gas is slow,of which the highest flow velocity is 0.12 m/s.The flow velocity of dry air and N_(2) is similar,with the highest flow velocity of 0.16 m/s.The result shows that,under insulation condition,it is feasible for dry air and N_(2) to take place of SF_(6) in terms of temperature rise.However,it is neccessray to pay attention to the higher temperature rise than SF_(6).And the distribution characteristics of flow field can provide a theoretical basis for the study on the reduction of temperature rise of dry air and N_(2) switchgear.