dc DC, D. C. = 1.direct current 直流电:a DC generator 直流发电机。 2.District of Columbia 哥伦比亚特区〔美国首都华盛顿所在的行政区域〕:Washington, D. C. 美国首都华盛顿。 3.〔意大利语〕 da capo (= repeat from the beginning). 4.Deputy Consul 副领事。 5.District Court 〔美国〕地方初审法院。
We adopted excitating voltage that its frequency is 0 . 5hz to replace dc excitating voltage when measured the dc magnetization characteristic 对于直流磁化特性的测量,本文采用了用0 . 5hz的激磁电压宋代替直流电压进行测量从而使测量方法更加简单。
Because the excitating voltage ' s frequency is 0 . 5hz , the signal of induced voltage is very small , even though smaller than noise . so how to accurate pick the weak signal is the key of measuring dc magnetization characteristic 由于激磁电压为0 . 5hz ,因此其感应电压非常小,甚至小于干扰信号,如何准确的采集到该弱信号是进行直流磁化特性测量的关键。
In accordance with the driving characteristics of ac driving locomotive , the working status of its traction transformer is analysed . the questions that should be considered in the traction transformer design of ac driving locomotive are mentioned . these questions are the large short - circuit impedance of traction winding , higher harmonic current , over - excitation and dc magnetization caused by large variation of the network voltage , etc . some disposal methods are given 针对交流传动电力机车的传动特点,对其中的牵引变压器的工作状态进行了分析,指出交流传动电力机车用牵引变压器设计时需考虑的牵引绕组的短路阻抗大、电流的高次谐波、网压波动大可能引起的过励磁以及直流磁化等问题,同时给出了相应的一些解决方法。