This paper analyses selectors of transverse differential current direction protection using two types polarizing voltage for double circuit lines on the same tower.
对两种极化电压下的横联差动电流方向保护的选择元件在同杆并架双回线故障下的动作行为进行了研究。
The experiment of observing the color changes of electrically controlled birefringence of liquid crystal cell with different applied voltage with polarizing microscope was presented.
介绍液晶电控双折射知识，给出在偏光显微镜下观测液晶盒的颜色随外加电压变化的实验。
The experiment of observing the color changes of electrically controlled birefringence of liquid crystal cell with different applied voltage with polarizing microscope was presented.
介绍液晶电控双折射知识，给出在偏光显微镜下观测液晶盒的颜色随外加电压变化的实验。
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