煤矿井下供电不漏电的具体标准是什么?绝缘电阻符合哪些要求时,漏电...
Tuesday, September 13, 2022
Thursday, December 28, 2023
Wednesday, August 9, 2023
Monday, August 21, 2023
Tuesday, September 13, 2022
Sunday, September 24, 2023
Monday, August 21, 2023
矿用隔爆型低压自动馈电开关用在什么地方?用来控制哪些电气设备?...
Monday, November 27, 2023
Tuesday, February 28, 2023
地面低压动力电的额定电压一般是()伏。A、36B、220C、380D、660...
Tuesday, December 26, 2023
Thursday, March 7, 2024
Thursday, March 7, 2024
Monday, August 21, 2023
Thursday, April 27, 2023
过电流是指流过电气设备和电缆的电流()额定值。A、大于B、小于C、等于...
Monday, October 9, 2023
有一台变压器投入运行后,发现二次电压下降很多,试说明其原因,如何处理?...
Thursday, March 7, 2024
Thursday, September 7, 2023
我国《煤矿安全规程》为什么规定,井下供电系统必须作到“三无、四有、三全、三坚持”,其含义是什么?...
Thursday, February 15, 2024
Thursday, April 27, 2023
下列哪些矿用电气设备属于隔爆设备()。A、主扇B、主提升机C、空压机D、采煤机...
Monday, November 27, 2023