问题:现场检验电能表时,一般要求电压对额定值的偏差不应超过();频率对...
Friday, September 16, 2022
问题: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
问题:315kVA以下用户的电能表的现场检验合格率要求≥95%...
Monday, January 22, 2024
问题:当需限制客户变电所6——10KV线路的短路电流时,可采用下列()...
Friday, September 16, 2022
Friday, September 16, 2022
Friday, September 16, 2022
问题: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
Sunday, February 19, 2023
问题: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
Friday, September 16, 2022
Friday, September 16, 2022
问题:用电负荷指用户用电设备在某一瞬间实际发生的()总和。...
Friday, September 16, 2022
问题:互感器运行变差定义为互感器误差受()而发生的变化。...
Friday, September 16, 2022
问题: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
问题: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
问题:()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
问题:关于导体电阻的正确说法是,因为电阻R=U/I,所以导体的电阻与外...
Friday, September 16, 2022
Friday, September 16, 2022
Friday, September 16, 2022
问题: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