Usually, it is difficult to compute the power-factor of DC drive electric locomotive, furthermore, the outcome is not exact.
通常情况下计算直流传动电力机车的功率因数较为困难，而且计算出来的数值不甚准确。
2
Battery electrical locomotive is a main transportation equipment in the well of colliery, which is drived by series-excitation DC electromotor mostly at the present time.
蓄电池式电机车是煤矿井下一种主要的运输装置，目前主要采用串激直流电动机驱动。
3
The development of EH200 type DC electric locomotive is introduced in this paper.