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Convective heat transfer and flow resistance characteristic around elliptical tubes with different axis radio K in cross flow are investigated in this paper. Eight types of elliptical tubes have been calculated using numerical method. The local and overall convective heat transfer coefficients and flow resistance coefficients are obtained with the Reynolds number ranging from 4000 to 80000. And the...
Expound the problems and danger of excessive current impulse through the capacitor when the parallel power quality conditioner starts charging. Two control strategies is discussed and compared. One method uses a current limiting resistor at the charging circuit and the other uses an auxiliary charging circuit. Both of these methods can effectively guarantee the safety of the device when it is put...
What this paper study is the influence of electric locomotive loads to three kinds of measurement unit of microcomputer relay protection. A model is constructed by EMTDC/PSCAD, containing typical power grid and three kinds of measurement unit of microcomputer relay protection. The influence degree by electric locomotive loads to the Fourier algorithm, solving differential equation algorithm and first-order...
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