. Construction and test of a rotary transformer for direct current . transformations. The load was connected between theJunction point of Sie short circuited brushes and one side ofthe supply circuit. Under normal conditions, when thereIs no circulating current flowing tnrough the armature a-cross the short circuited brushes, each brush and each maincoil will be carrying half djhe secondary load ourrentj if,however, a circulating current arises, it will tlow in op-osition to the load ciirrent in one coll 3, and in conjunc-tion with a load in the other coil, 4; in effect. Therefore,the current
. Construction and test of a rotary transformer for direct current . transformations. The load was connected between theJunction point of Sie short circuited brushes and one side ofthe supply circuit. Under normal conditions, when thereIs no circulating current flowing tnrough the armature a-cross the short circuited brushes, each brush and each maincoil will be carrying half djhe secondary load ourrentj if,however, a circulating current arises, it will tlow in op-osition to the load ciirrent in one coll 3, and in conjunc-tion with a load in the other coil, 4; in effect. Therefore,the current in coll 5, will be less tnan in 4, and if thesecoils are suitably coupled up, will nave the effect of cor-recting or preventing the short circuited current from ris-ing to any considerable value, in other words, as the cur-rent in coil 3 is less than the ctirrent in coil 4, the pole 3 is less than the of 4, and this tends tocause a greater voltage to be generated under pole 4, thanunder pole 3, thus opposing the voltage which xa creating the -16-. oircnlating oturrent. In oomiecting tnis maohine, anmeters were placedIn the field circuit, line circuit, and load were connected across the supply and sec-ondary terminals, an alternating current voltmeterwas connected across the brushes (Id, b) to give thedifferente of potential between them, which v;as re-sponsible for the short circuited currenx. A magnetoand voltmeter was calibrated to give the speed. Themagneto being belt-driven from the armatiire shaft*For starting a carbon pile rheostat was inserted inthe supply line. This was parallelled by a shortcircuiting switch which was closed when the machinewas up to speed* ;:>uitable protective apparatus wasinstalled in the linOi^ the load was taken up by car-bon piles on low voltage, and lamp racks in serieson high. All instruments were calibrated before andafter the test. Curves for these are included inthis report. Runs were taken for both ful
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Keywords: ., bookcentury1900, bookdecade1910, bookidconstruction, bookyear1911
