dc DC, D. C. = 1.direct current 直流電:a DC generator 直流發(fā)電機。 2.District of Columbia 哥倫比亞特區(qū)〔美國首都華盛頓所在的行政區(qū)域〕:Washington, D. C. 美國首都華盛頓。 3.〔意大利語〕 da capo (= repeat from the beginning). 4.Deputy Consul 副領(lǐng)事。 5.District Court 〔美國〕地方初審法院。
We adopted excitating voltage that its frequency is 0 . 5hz to replace dc excitating voltage when measured the dc magnetization characteristic 對于直流磁化特性的測量,本文采用了用0 . 5hz的激磁電壓宋代替直流電壓進行測量從而使測量方法更加簡單。
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 由于激磁電壓為0 . 5hz ,因此其感應(yīng)電壓非常小,甚至小于干擾信號,如何準確的采集到該弱信號是進行直流磁化特性測量的關(guān)鍵。
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 針對交流傳動電力機車的傳動特點,對其中的牽引變壓器的工作狀態(tài)進行了分析,指出交流傳動電力機車用牽引變壓器設(shè)計時需考慮的牽引繞組的短路阻抗大、電流的高次諧波、網(wǎng)壓波動大可能引起的過勵磁以及直流磁化等問題,同時給出了相應(yīng)的一些解決方法。