Fig. 2,042.—Westinghouse rotary converter armature coils. These are wound from bar copper and are interchangeable. The armature coils are heavily insulated to withstand the tests specified in the standardization rules of the American Institute of Electrical Engineers.
Fig. 2,034 shows a complete diagram of the electrical connections. A single phase rotary is illustrated so as to simplify the wiring.
The table of Steinmetz on page [1,464] gives the values of the alternating volts and amperes in units of direct current.
Ques. How is the voltage of a rotary varied on the direct current side?
Ans. Pressure or potential regulators are put in the high tension alternating current circuit and may be regulated by small motors operated from the main switchboard or operated by hand.
Ques. What is the advantage of unity power factor for rotary converters?
Ans. It prevents overheating when the rotary is delivering its full load in watts.
Ques. What greatly influences the power factor of the high tension line?
Ans. The strength of the magnetic field.