TransactionsPublished under the care of the General Secretary and the Treasurer . least sufficientlylarge that its load corresponds to the wattless currents of the plant,since otherwise they could be overloaded. When one connects a com-pounded machine in parallel with an existing plant it correctsentirely automatically all pressure variations. The machines are. 774 HEYLAND: COMPOUNDED ALTERNATORS. therefore, well adapted to installation in systems ixi which largervoltage variations are present. If, for example, it is desired to keepthe voltage constant at certain points in a network, this can
TransactionsPublished under the care of the General Secretary and the Treasurer . least sufficientlylarge that its load corresponds to the wattless currents of the plant,since otherwise they could be overloaded. When one connects a com-pounded machine in parallel with an existing plant it correctsentirely automatically all pressure variations. The machines are. 774 HEYLAND: COMPOUNDED ALTERNATORS. therefore, well adapted to installation in systems ixi which largervoltage variations are present. If, for example, it is desired to keepthe voltage constant at certain points in a network, this can beaccomplished in the simplest manner by connecting at these pointsthe compounded machines in parallel as motors running light. Themachines then regulate the voltage in the same manner as, for ex-ample, overexcited synchronous motors have frequently been usedhitherto; but with the difference that the compounded machineswill not, as in the other case, have to be kept adjusted by hand,but work automatically and take up automatically and in-slanteously every variation of Fig. 5. Finally I will mention a more recent compounding connection,which is of interest in so far as the connection can be applieddirectly to the machine without the interposition of this arrangement the polypliase-exciting current is generatedin three auxiliary coils which are located on the stator. In orderthat such a machine may be at the same time compounded, a mostsimple arrangement has been devised whereby, in the same slots inwhich the auxiliary winding lies, there is placed also a part of themain winding, the respective coils being, however, connected inopposite directions to the remaining part of the main winding. Thearrangement is diagramatically shown in Fig 5. <7 is the com-
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Keywords: ., bookcentury1900, bookdecade1900, bookidtr, booksubjectelectricity
