论文部分内容阅读
我矿103(米~3/分)空压机,利用450千瓦、380伏鼠笼型电动机拖动,额定电流890安。我们因找不到一台适当的变压器,只好选用两台320千伏安变压器并联,给空压机电动机供电。变压器一次电压6300伏,二次电压400伏,两台变压器额定电流是920安,短路阻抗近似相等。两台变压器基本上处于满负荷运行状态,一旦其中一台星点开焊或低压套管螺丝接触不良,另一台变压器就会因过负荷运行而烧毁。为此,必须增加并联保护措施。我矿的变压器安装在露天,采用了分流保
I mine 103 (m ~ 3 / min) air compressor, the use of 450-kilowatt, 380-volt squirrel-cage motor drag, rated current of 890 amps. Because we could not find an appropriate transformer, we had to use two 320 kVA transformers in parallel to power the air compressor motor. Transformer primary voltage of 6300 volts, the secondary voltage of 400 volts, two transformers rated current is 920 amps, short-circuit impedance is approximately equal. The two transformers are basically in full load operation, once one of the star point open welding or low-pressure casing screw contact is poor, the other transformer will be burned due to overload operation. To this end, parallel protection measures must be added. My mine transformer installed in the open, with a shunt