1) touch voltage
接触电压
1.
By analyzing the effects of touch voltage and equipotential bonding on low voltage distribution system,makes clear the importance and necessity of equipotential bonding on design and construction.
通过对接触电压、等电位联结在低压配电系统中作用的分析,进一步明确等电位联结在设计、施工中的重要性及必要性。
2.
To equalize the potential and decrease touch voltage and step voltage on the earth s surface, an optimum design of grounding systems is proposed in this paper.
为了均匀地表面的电位分布 ,进一步降低接触电压和跨步电压 ,更好地保障人身和设备的安全 ,论文提出了接地系统优化设计方法。
3.
When the thickness of the low resistivity soil layer increases from the top of the grounding grid to the bottom of the grounding grid, the grounding resistance will increase dramatically and the touch voltage quickly decrease.
当受影响的地表层的厚度从小于地网埋深变化到大于地网的埋深时 ,接地电阻的减小有一个跃变 ,接触电压将急剧减小 ,低于正常情况时的对应值。
2) contact voltage
接触电压
1.
The moments method is adopted to calculate the electrical potential produced on the ground surface by the rectangular concrete grounding peg buried in the uniform soil, the contact voltage and the step voltage.
用矩量法对埋在均匀土壤中的矩形混凝土接地桩在地面所产生的电位以及接触电压、跨步电压等进行了计算,并结合MATLAB语言,绘制了地面电位二维与三维分布图。
2.
Through introduction of calculated contact voltages in three different situations the necessity of general equipotential bonding in TN-C-S system are illustrated.
在TN C S系统中 ,通过三种情况对计算预期接触电压作了介绍 ,说明了总等电位联结的必要性和它在发生接地故障时所起的降低接触电压 ,减小人体伤害和火灾发生的作用。
3.
The calculations of short circuit current,contact voltage and step voltage when the Ling ao nuclear power plant 500kV switchgear station occurs single-phase earthing short circuit are introduced.
主要介绍了广东岭澳核电站500 kV开关站母线发生单相接地短路时,站内短路电流、接触电压和跨步电压差的计算。
3) touch potential
接触电压
1.
The fact shows that the specific resistance of concrete steel has little influence upon the touch potential and stray current, while the specific resistance of rail, the rail-ground transition resistance, the train current and the distance between the transformer substations have greater influence upon them.
从离散模型出发,利用有限元分析法对地铁直流牵引供电系统的接触电压及杂散电流进行了分析。
4) step voltage
接触电压
1.
To equalize the potential on the earth surface,and to ensure the safety of equipment and people,the calculation formula of the optimum compression ratio is analyzed numerically and obtained in uniform soil,which is based on inequipotential model,and it is obtained when the difference of maximum and minimum step voltage reaches a minimum and by the variable metric method.
为使地表面的电位均匀分布,在不等电位模型的基础上,建立最大和最小接触电压差值最小的目标函数,使用变度量法用数值计算分析得到了均匀土壤时最优压缩比的计算公式。
5) contact drop
接触电压降
1.
In order to improve the conductivity and wearability of copper-graphite composite brush,the brush contact drop was investigated under the different percent of carbon fiber conditions.
为进一步改善铜-石墨复合材料电刷的导电和耐磨性,提高其使用寿命,研究了在通电条件下,碳纤维含量对铜-石墨电刷接触电压降的影响。
2.
The effect of the electric current on the contact drop of the composite electric brush was also examined.
采用粉末冶金方法制备了碳纳米管-银-石墨复合材料,研究了复合材料在机械磨损和带电磨损2种状态下的摩擦磨损性能及接触电压降的变化情况。
6) contact voltage drop
接触电压降
1.
Effect of circular velocity on the contact voltage drop of CNT-Ag-G composite;
圆周速度对碳纳米管-银-石墨复合材料接触电压降的影响
2.
Effects of electrical polarity on contact voltage drop of CNTs-Ag-G composite;
电流极性对CNTs-Ag-G复合材料接触电压降的影响
3.
The effect of the electrical current(0-25A/cm~2) on the contact voltage drop and wear properties of CNTs-Ag-G composite was studied.
采用粉末冶金方法制备碳纳米管-银-石墨复合材料,研究了电流密度对碳纳米管-银-石墨复合材料的接触电压降及其磨损性能的影响。
补充资料：接触电压
人接触与接地装置相连的电工设备外壳等接触处和人站立点间的电位差。电流通过接地装置（见接地）时，大地表面会形成以电流入地点为中心的分布电位，距电流入地点越近,电位越高。地面上到设备约1臂水平距离处与沿设备外壳离地面垂直距离约 1人高度处两点之间的电位差称为接触电位差(电工行业习称接触电势)。人体接触该两点所承受的电压称为接触电压。图中所示，当任一台电动机绝缘损坏，发生碰壳短路时，因为它们的外壳接在同一接地极上,3台电动机外壳都得到与接地极相同的对地电压U 。人手接触任一电动机外壳时，在人的手和脚之间都将承受接触电压，而且距接地体越远，接触电压越高。接触电位差主要产生于电力系统的短路电流，也可能来自雷击电流。为了避免接触电压对人身的伤害，接地网的外缘应该闭合，外缘各角应做成圆弧形。如仍不能满足要求，可敷设水平均压带。接地网边沿经常有人通过的地方，可铺设砾石或沥青路面,也可敷设均压带。中国有关标准规定,在大接地短路电流系统发生单相接地或同点两相接地时，地面到设备水平距离0.8m处与设备外壳（或与外壳相连的架构）或墙壁离地面垂直距离1.8m处之间的电位差应满足下式规定式中ρ为人脚站立处地表的土壤电阻率（Ωm）,t为接地短路电流的持续时间 (s)。在小接地短路电流接地系统中发生单相接地时，一般并不迅速切断故障，接地电流的持续时间比较长，所以，须把接触电位差的允许值降低。此时，Et应满足下式的规定Et＝50＋0.05ρ条件比较恶劣的场所,如矿井和水田,Et的允许值应适当降低。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条