雷电导流条在设计之初的目的就是在于对特定条件下的系统结构进行雷电疏导,其主要依据的原理是表面闪络原理,利用高频电流的趋肤效应,人为的改变单位区域的电场畸变率来实现定向闪络传导的目的。通过雨蚀数据推测在风沙严重的条件下,表...雷电导流条在设计之初的目的就是在于对特定条件下的系统结构进行雷电疏导,其主要依据的原理是表面闪络原理,利用高频电流的趋肤效应,人为的改变单位区域的电场畸变率来实现定向闪络传导的目的。通过雨蚀数据推测在风沙严重的条件下,表面粘贴方案的产品有效寿命恐难保证。铆钉结构产品的优势不仅在于其稳固的结构形式,更在于其金属导体材料的组成。金钛合金在大电流作用下同样具有较高的抗氧化性,因此在通过200 k A的雷电流测试后并没有出现大面积升华显现,保证了金属导体外观结构的稳定性、金属片与基材牢固的结构也没有造成基材的损坏,通过实验表明,在铆钉结构的导流条工作面传导200 k A雷电流的情况下,其基层底部的金属铆钉没有任何损伤。展开更多
A new insulation system with inorganic A-B-A insulators was proposed to improvethe surface flashover performance in vacuum. Inorganic A-B-A insulator samples of M0/Al2O3cermet-Al2O3 ceramic-Mo/Al2O3 cermet were prepar...A new insulation system with inorganic A-B-A insulators was proposed to improvethe surface flashover performance in vacuum. Inorganic A-B-A insulator samples of M0/Al2O3cermet-Al2O3 ceramic-Mo/Al2O3 cermet were prepared, in which the conductivity and permittivityof the Mo/Al2O3 cermets were controlled through different amount of metallic molybdenumpowder added. The effects of both conductivity and permittivity of Mo/Al2O3 cermets on theDC and impulse surface flashover voltage in vacuum were experimentally investigated. The resultshowed that the DC and impulse surface flashover voltage were improved by 52% and 95%, respectively.For the distribution of electric field, two triple junctions, i.e., vacuum-layer A-cathode（TJ1） and vacuum-layer A-layer B （TJ2） were prepared with the introduction of layer A into theA-B-A insulation system. Based on the electric field distribution obtained via electrostatic fieldsimulation and Maxwell-Wagner three-layer model, the electric field of TJ1 decreases while thatof TJ2 increases with the increase in conductivity and permittivity of layer A under applied DCand impulse voltage, respectively. Therefore, the improvement of surface flashover performance ofA-B-A insulators has been reasonably explained.展开更多
文摘雷电导流条在设计之初的目的就是在于对特定条件下的系统结构进行雷电疏导,其主要依据的原理是表面闪络原理,利用高频电流的趋肤效应,人为的改变单位区域的电场畸变率来实现定向闪络传导的目的。通过雨蚀数据推测在风沙严重的条件下,表面粘贴方案的产品有效寿命恐难保证。铆钉结构产品的优势不仅在于其稳固的结构形式,更在于其金属导体材料的组成。金钛合金在大电流作用下同样具有较高的抗氧化性,因此在通过200 k A的雷电流测试后并没有出现大面积升华显现,保证了金属导体外观结构的稳定性、金属片与基材牢固的结构也没有造成基材的损坏,通过实验表明,在铆钉结构的导流条工作面传导200 k A雷电流的情况下,其基层底部的金属铆钉没有任何损伤。
基金supported by National Science Fund for Outstanding Young Scholars of China (No. 50625721)
文摘A new insulation system with inorganic A-B-A insulators was proposed to improvethe surface flashover performance in vacuum. Inorganic A-B-A insulator samples of M0/Al2O3cermet-Al2O3 ceramic-Mo/Al2O3 cermet were prepared, in which the conductivity and permittivityof the Mo/Al2O3 cermets were controlled through different amount of metallic molybdenumpowder added. The effects of both conductivity and permittivity of Mo/Al2O3 cermets on theDC and impulse surface flashover voltage in vacuum were experimentally investigated. The resultshowed that the DC and impulse surface flashover voltage were improved by 52% and 95%, respectively.For the distribution of electric field, two triple junctions, i.e., vacuum-layer A-cathode（TJ1） and vacuum-layer A-layer B （TJ2） were prepared with the introduction of layer A into theA-B-A insulation system. Based on the electric field distribution obtained via electrostatic fieldsimulation and Maxwell-Wagner three-layer model, the electric field of TJ1 decreases while thatof TJ2 increases with the increase in conductivity and permittivity of layer A under applied DCand impulse voltage, respectively. Therefore, the improvement of surface flashover performance ofA-B-A insulators has been reasonably explained.
