三相四线有功电能表,抄表时发现一相电流接反,抄得电量为500kW...
Friday, September 16, 2022
一只阻值为100欧、容许功率为4W的电阻和另一只阻值为20欧、容...
Friday, September 16, 2022
()是许多电子式电能表的关键部分,它又称PWN乘法器。...
Friday, September 16, 2022
在使用相序表时,当将其标有U、V、W的三个端子分别接向电能表的三个电压端子时,可能出现三种接线顺序,即()。这三种接线顺序均属正相序。A、U-V-WB、W-U-VC、V-W-UD、U-W-V...
Sunday, February 19, 2023
U/f变换器可由()比较器、时钟脉冲发生器等组成。A、放大器B、分频器C、积分器D、信号源...
Thursday, May 18, 2023
Friday, September 16, 2022
Friday, September 16, 2022
Friday, September 16, 2022
某用户月平均用电为20万kW•h,则应安装()计量装置。A、Ⅰ类B、Ⅱ类C、Ⅲ类D、Ⅳ类...
Thursday, January 25, 2024
用于计量变压器容量为315kVA的计费用户的计量装置属于()类。...
Friday, September 16, 2022
测量用互感器可根据技术性能、使用的环境条件和频繁程度等因素,确定...
Friday, September 16, 2022
电能表标准装置输出功率稳定度的标准偏差估计值,应不超过装置允许功...
Friday, September 16, 2022
减极性电流互感器一次绕组电流从L1端钮流入,L2端钮流出,则二次...
Friday, September 16, 2022
Friday, September 16, 2022
Friday, September 16, 2022
电力法规定,并网双方应当按照()原则,签订并网协议,确定双方的权...
Saturday, September 17, 2022
规格相同的电流互感器串联后,电流比为单台变比的()倍。...
Friday, September 16, 2022
Friday, September 16, 2022
Friday, September 16, 2022
从理论上讲,电流互感器一次电流、二次电流之比与一、二次绕组匝数(...
Friday, September 16, 2022