. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . -- current flow is the same in all the bondsit is only necessary to consider one. Thepropulsion current divides the other turns,thereby producing in them a secondaryelectromotive force or voltage which willoppose the impressed voltage driving thecurrent through the coil. This opposingvoltage nearly offsets the impressed volt-age and cuts the current down to nearlya negligable quantity. As mentioned above, the two main directcurrents in the bond neutralize each otherso that there is no flux in
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . -- current flow is the same in all the bondsit is only necessary to consider one. Thepropulsion current divides the other turns,thereby producing in them a secondaryelectromotive force or voltage which willoppose the impressed voltage driving thecurrent through the coil. This opposingvoltage nearly offsets the impressed volt-age and cuts the current down to nearlya negligable quantity. As mentioned above, the two main directcurrents in the bond neutralize each otherso that there is no flux in the iron coreand hence no self-induction as far as thedirect current circuit is concerned. How-ever, the condition is different witli theAC signal circuit. To avoid confusion,but realizing that the condition still existsin the bond at the left, we will consideronly the AC signal current in the bond atthe right. This carries alternating cur-rent, reversing in direction many times aminute, so that the direction of currentflow, as shown by the arrows, is the in-stantaneous direction. The alternating. PROPULSION CURRENT
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