柜式气体绝缘开关设备(cubicle gas insulatedswitchgear,C-GIS)由于其全可靠性能高、小型化等特点在电力系统中得到广泛的应用。但由于C-GIS开关柜的主要绝缘介质SF6气体具有较强的温室效应,且其成本较高,迫切需要减少或不用SF6气体。...柜式气体绝缘开关设备(cubicle gas insulatedswitchgear,C-GIS)由于其全可靠性能高、小型化等特点在电力系统中得到广泛的应用。但由于C-GIS开关柜的主要绝缘介质SF6气体具有较强的温室效应,且其成本较高,迫切需要减少或不用SF6气体。针对C-GIS开关柜较低的气压条件,探讨SF6混合气体替代SF6的可行性。采用圆形平板电极模拟均匀场,研究均匀场、较低气压(0.1~0.25 MPa)下SF6与N2、CO2两种气体的二元混合气体在不同配比、不同电压形式(工频和负极性雷电冲击)作用下的击穿特性。试验结果表明,气压在0.25 MPa以下时,适当增大SF6混合气体的压强可以使其达到纯SF6相同的绝缘强度,为新型C-GIS开关柜的设计制造提供了关键的试验依据。展开更多
The title compound was prepared from the reaction of diaza-18-crown-6 and sodium chloroacetate in aqueous solution and crystallized from ethanol solution by standing for a long time. The complex [Na(C16H28N2O8)·N...The title compound was prepared from the reaction of diaza-18-crown-6 and sodium chloroacetate in aqueous solution and crystallized from ethanol solution by standing for a long time. The complex [Na(C16H28N2O8)·Na(H2O)5]2Cl-·2H2O+·H2O (Mr = 655. 45) crystalizes in triclinic system,space group P1 with a = 9. 623(2),b = 10. 902(3),c=15. 867(3) A ;α= 104. 63(2),β= 105. 42(2),γ=99. 88(2)°,V = 1502. 3A3,Dc=1. 09gcm-3,Z = 2,F(000) = 516,final R=0. 075 for 3218 observed reflections. The donor atoms O(4) ,O(7) ,O(13) ,O(16) ,N(1) and N(10) from the crown ether as well as the oxygen atoms O(21) and O(26) from two car boxy lato anions are coordinated cooperatively to the Na(1)+ ion to form crown ether solvated cation in a tetragonal prismatic geometry. The O(22) of one carboxylato anion, which does not coordinate the Na(1) + ion,interacts with the Na(2)+ion together with the oxygen atoms of five water molecules to form a hydrated cation having a deformed octahedral configuration.展开更多
The novel carbazole derivative — 3-biacetyl-6-benzoyl-N-ethylcarbazole was synthesized through alkylation and Friedel-Crafts acylation from carbazole.The structure of the target compound was characterized by 1HNMR,13...The novel carbazole derivative — 3-biacetyl-6-benzoyl-N-ethylcarbazole was synthesized through alkylation and Friedel-Crafts acylation from carbazole.The structure of the target compound was characterized by 1HNMR,13CNMR,UV,IR and elemental analysis.The optimal synthetical conditions for the monoacylation was achieved by carrying out orthogonal experiments:when the mole ratio of benzoyl chloride and N-ethyl-carbazole was1.2:1,while the mole ratio of catalyst and N-ethylcarbazole was 1.2:1 at 25℃for 3h.The yield was about 94.6%.展开更多
文摘柜式气体绝缘开关设备(cubicle gas insulatedswitchgear,C-GIS)由于其全可靠性能高、小型化等特点在电力系统中得到广泛的应用。但由于C-GIS开关柜的主要绝缘介质SF6气体具有较强的温室效应,且其成本较高,迫切需要减少或不用SF6气体。针对C-GIS开关柜较低的气压条件,探讨SF6混合气体替代SF6的可行性。采用圆形平板电极模拟均匀场,研究均匀场、较低气压(0.1~0.25 MPa)下SF6与N2、CO2两种气体的二元混合气体在不同配比、不同电压形式(工频和负极性雷电冲击)作用下的击穿特性。试验结果表明,气压在0.25 MPa以下时,适当增大SF6混合气体的压强可以使其达到纯SF6相同的绝缘强度,为新型C-GIS开关柜的设计制造提供了关键的试验依据。
基金Project supported by the National Foundation of Natural Sciences
文摘The title compound was prepared from the reaction of diaza-18-crown-6 and sodium chloroacetate in aqueous solution and crystallized from ethanol solution by standing for a long time. The complex [Na(C16H28N2O8)·Na(H2O)5]2Cl-·2H2O+·H2O (Mr = 655. 45) crystalizes in triclinic system,space group P1 with a = 9. 623(2),b = 10. 902(3),c=15. 867(3) A ;α= 104. 63(2),β= 105. 42(2),γ=99. 88(2)°,V = 1502. 3A3,Dc=1. 09gcm-3,Z = 2,F(000) = 516,final R=0. 075 for 3218 observed reflections. The donor atoms O(4) ,O(7) ,O(13) ,O(16) ,N(1) and N(10) from the crown ether as well as the oxygen atoms O(21) and O(26) from two car boxy lato anions are coordinated cooperatively to the Na(1)+ ion to form crown ether solvated cation in a tetragonal prismatic geometry. The O(22) of one carboxylato anion, which does not coordinate the Na(1) + ion,interacts with the Na(2)+ion together with the oxygen atoms of five water molecules to form a hydrated cation having a deformed octahedral configuration.
文摘The novel carbazole derivative — 3-biacetyl-6-benzoyl-N-ethylcarbazole was synthesized through alkylation and Friedel-Crafts acylation from carbazole.The structure of the target compound was characterized by 1HNMR,13CNMR,UV,IR and elemental analysis.The optimal synthetical conditions for the monoacylation was achieved by carrying out orthogonal experiments:when the mole ratio of benzoyl chloride and N-ethyl-carbazole was1.2:1,while the mole ratio of catalyst and N-ethylcarbazole was 1.2:1 at 25℃for 3h.The yield was about 94.6%.
