封闭容器内短路燃弧压力升计算仿真参数分析
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摘要
建立了开关柜封闭容器物理模型,并基于CFD的间接耦合分析方法,采用CFX仿真分析了小封闭容器内短路燃弧压力升分布,并分析了网格数量、仿真时间步长、电弧尺寸以及电弧位置等参数对计算结果的影响。分析表明:当网格数达到一定程度时,增大网格数量对计算结果影响不大,同时电弧尺寸和电弧位置对封闭容器短路燃弧压力升影响较小;仿真时间步长对计算结果存在一定的影响,综合计算效率和计算精度建议前3 ms采用自适应时间步长,3 ms后采用固定步长分析。
A physical model of closed container for switch gear was established.Meanwhile,the distribution of the short circuit arcing pressure in the small enclosed container was simulated by ANSYS CFX based on the CFD indirect coupling analysis method.In addition,the influence of parameters such as grid quantity,simulation time step,arc size and arc position on the calculation of short-circuit arcing pressure in closed container were analyzed. Research showed that when the grid number reached a certain level,the number of grid increases has little effect on the calculation results.Besides,the arc size and arc position have little effect on the simulation result.The simulation time step has some influence on the calculation result,and its selection should consider the calculation efficiency and calculation precision.it was recommended that adaptive time step should be adapted in the first 3 ms and fixed step size analysis should be adapted after 3 ms.
A physical model of closed container for switch gear was established.Meanwhile,the distribution of the short circuit arcing pressure in the small enclosed container was simulated by ANSYS CFX based on the CFD indirect coupling analysis method.In addition,the influence of parameters such as grid quantity,simulation time step,arc size and arc position on the calculation of short-circuit arcing pressure in closed container were analyzed. Research showed that when the grid number reached a certain level,the number of grid increases has little effect on the calculation results.Besides,the arc size and arc position have little effect on the simulation result.The simulation time step has some influence on the calculation result,and its selection should consider the calculation efficiency and calculation precision.it was recommended that adaptive time step should be adapted in the first 3 ms and fixed step size analysis should be adapted after 3 ms.
引文
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[15]黎鹏,阮江军.封闭容器内部短路燃弧爆炸压力效应计算[J].爆炸与冲击,2017,37(6):1065-1071.
[16]秦知航.模拟开关设备内部交流短路燃弧压力升研究[D].武汉:武汉大学,2016.
[2]于庆瑞,奚育宏.耐受内部电弧故障级中压开关柜的研究[J].电气制造,2010(8):34-36.
[3] DAALDER J E,LILLEVIK O,REIN A,et al.Arc in SF6-MV-switchgear pressure rise in equipment room[C]//14th International conference and exhibition on electricity distribution(CIRED),1989:37-41.
[4] DASBACH A,PIETSCH G J. Calculation of pressure waves in substation buildings due to arcing faults[J].IEEE transactions on power delivery,1990,5(4):1760-1765.
[5] FRIBERG G,PIETSCH G J. Calculation of pressure rise due to arcing faults[J].IEEE transactions on power delivery,1999,14(2):365-370.
[6] ZHANG X,PIETSCH G,ZHANG J,et al.Fundamental investigation on the thermal transfer coefficient due to arc faults[J]. IEEE transactions on plasma science,2006,34(3):1038-1045.
[7] ZHANG X,PIETSCH G,GOCKENBACH E.Investigation of the thermal transfer coefficient by the energy balance of fault arcs in electrical installations[J]. IEEE transactions on power delivery,2006,21(1):425-431.
[8] ZHANG X,ZHANG J,PIETSCH G.Estimation of the arc power during a three-phase arc fault in MV electrical installations[J]. IEEE transactions on plasma science,2007,35(3):724-730.
[9] IWATA M,ANANTAVANICH K,PIETSCH G J.Influence of arc current on fraction kp of electric arc energy leading to pressure rise in a closed container[C]//International conference on gas discharges and their applications.IEEE,2008:189-192.
[10] IWATA M,ANANTAVANICH K,PIETSCH G J.Influence of current and electrode material on fraction,of electric arc energy leading to pressure rise in a closed container during internal arcing[J].IEEE transactions on power delivery,2010,25(3):2028-2029.
[11] IWATA M,TANAKA S I,OHTAKA T,et al.CFD calculation of pressure rise due to internal AC and DC arcing in a closed container[J].IEEE transactions on power delivery,2011,26(3):1700-1709.
[12]黄锐,马炳裂.开关柜内部电弧故障产生力和热的计算模型[J].爆炸与冲击,2000,20(2):125-130.
[13]熊泰昌.内部电弧故障试验情况下中压开关柜强度计算[J].高压电器,2002,38(4):42-44.
[14]张晓芸.KYN28A型开关柜内部故障的电弧结构设计[J].机械研究与应用,2009,22(4):134-136.
[15]黎鹏,阮江军.封闭容器内部短路燃弧爆炸压力效应计算[J].爆炸与冲击,2017,37(6):1065-1071.
[16]秦知航.模拟开关设备内部交流短路燃弧压力升研究[D].武汉:武汉大学,2016.