Solidification behavior of alloy ZA27 under action of direct current;
ZA27合金在直流电流作用下的凝固行为
Analysis on the causes of direct current fluctuation in rectifying system and the solutions;
整流系统直流电流波动原因分析及解决方案
The influences of direct current density,heating temperature,and holding time on the microstructure evolution of magnesium alloy AZ91D during semi-solid isothermal heat treatment were studied,and the related mechanism was also discussed.
考察了直流电流密度、等温温度及等温时间对 AZ91D 镁合金半固态组织的影响,对电流影响组织演变的机理进行了探讨。
The calculation results of DC currents through transformer neutrals of HVDC system operated in monopole-ground return mode with the influence of sea considered are evidently different from those calculated by terrestrial soil model.
考虑海洋影响的直流输电单极大地运行时变压器中性点流过的直流电流与陆地土壤模型计算的结果有很大不同。
The DC current through transformer neutrals may make the transformers DC biases.
结合岭澳和大亚湾核电站主变的具体情况,按实测的流过主变中性点直流电流结果建立了相应的大地电网计算模型,并对在变压器中性点串联电容的方法进行了深入的分析,还根据分析结果提出了有关设备的主要技术参数。
But the AC and DC transmission system brings DC current in neuter spot of transformer,it will affect the natural running of transformer and whole power system, and the effect to transfomer is different with different configuration,so it is necessary to messure and restrain the DC current in neuter spot of transformer.
但是,交、直流混合输电系统会在交流变压器中性点产生直流电流,造成变压器绕组直流偏磁影响变压器和整个系统的正常运行,并对不同结构变压器产生影响的程度也不尽相同,因此,必须对变压器中性点直流电流进行有效的检测和抑制。
The directional current action mechanics in ZA42 solidification mode was discussed from following aspects: current effecting solidifi.
从电流对凝固界面的稳定性、溶质分配系数和过冷度的影响几个方面讨论了直流电流对ZA42合金凝固方式的作用机理。
A novel digitally controlled DC current source was presented to overcome the widely existed drawbacks of traditional DC current source such as low precision,narrow adjusting range and bad stability.
针对普通直流电流源普遍存在的精度低、调节范围小、稳定性差等缺点,设计了一种新型低纹波高精度数控直流电流源。
By making good use of the intelligent measure and control function of the Microprogrammed Control Unit(MCU),the numerical-controlled and scanned direct current source is designed.
利用单片机所具有的智能测控特点,设计出基于单片机的“数控与扫描直流电流源”。