. Electric railway journal . ossibility thatself-excitation will follow because of the idle rotation. The main transformer, combined with the auxiliarytransformers and the choke coils, is submerged in oil casing has copper ribs which permit most effi-cient cooling. The oil switch has four contacts. Thetwo contacts which close the circuit before the others CONTROL The control is effected by electromagnetic contactors,the coils of which are fed with single-phase current at300 volts. The accompanying diagram of connectionsshows the different functions of these contactors. Thetwelve contac
. Electric railway journal . ossibility thatself-excitation will follow because of the idle rotation. The main transformer, combined with the auxiliarytransformers and the choke coils, is submerged in oil casing has copper ribs which permit most effi-cient cooling. The oil switch has four contacts. Thetwo contacts which close the circuit before the others CONTROL The control is effected by electromagnetic contactors,the coils of which are fed with single-phase current at300 volts. The accompanying diagram of connectionsshows the different functions of these contactors. Thetwelve contactors used for the power-control connectthe terminals D., and D3 of a choke coil with taps T1 toTlt of the load transformer. Tap Dx of the choke coilfeeds the motors at pressures lying between any twoadjacent steps, Tlt T.,, T.,, T,, etc., the contactors of whichhave just been closed. To vary the motor voltage, thesecontactors are opened and closed alternately. Interrup-tion of the current is avoided because at least one con-. Rhaetian Railway-—Light Steel Catenary Bridges at Schuls-Tarasp Station are connected in series with an ohmic resistance to pro-tect the transformer from rushes of current at theinstant when the oil switch is closed. The switch canbe operated from either cab by direct mechanical or Load Transformer 0 ontactors Auto-Transformer jmmmmmmtftmmimv. CT7° V , { fcoptncto Contactoi CUoke L£lfti; LS-T^ Choke Cc,I Coil I »:>—1
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