VO.ITH齿轮泵 IPH 15-140 H59.604211 意大利 Lika C50-Y-360BNF210L3
VO.ITH齿轮泵 IPH 15-140 H59.604211 意大利 Lika C50-Y-360BNF210L3
H+L WE50-4R100R24/OHN
H+L WE50-4R100R24/OHN
H+L WE50-4R100R24/OHN
H+L WE50-4R100R24/OHN
H+L WE50-4R100R24/0H电磁阀
H+L WE50-4R100R24/0H电磁阀
H+L WE50-4R100R24/0H电磁阀
H+L WE50-4R100R24/0H电磁阀
H+L WE234-4L1281Z24/OH电磁阀
H+L WE09-4L100Z24/0H电磁阀
H+L WE09-4L100Z24/0H电磁阀
H+L WE09-4L100-Z24/0H
H+L WE09-4L100-Z24/0H
H+L WE09-4L100Z24/0H
H+L WE09-4L100Z24/0H
H+L WE09-4L100Z24/0H
H+L WE09-4L100Z24/0H
H+L WE08-6P100-E24/OHN
H+L WE08-6P100-E24/OHN
H+L WE08-6P100-E24/OHN
H+L WE08-6P100-E24/OHN
【工业知识】
电工基本知识——什么叫大地?
当电气设备发生接地故障时,接地电流就通过接地线和接地体流入地下,并向在地做半球形疏散。在靠近接地体的地方,半球面较小,电阻大,接地电流通过此处的电压降也大,其电位就高;在距离接地体较远的地方,半球面较大,电阻小,电压降也小,其电位也就低。以接地体为圆心,球形的半径约20m,其电位实际趋近于零,一般称为大地或地。