Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . l be divided auto-matically to give the best results. This sort of arrangementmight not be very satisfactory for taking care of electric lightingloads if there were likely to be exceptionally frequent reversalsof the operation of the converter from alternating to directcurrent and vice versa, as there might be a voltage change ofseveral per cent, which would perceptibly affect illuminationuntil again adjusted at the switchboard. In most cases, how- LOW-PRESSURE STEAM TUR
Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . l be divided auto-matically to give the best results. This sort of arrangementmight not be very satisfactory for taking care of electric lightingloads if there were likely to be exceptionally frequent reversalsof the operation of the converter from alternating to directcurrent and vice versa, as there might be a voltage change ofseveral per cent, which would perceptibly affect illuminationuntil again adjusted at the switchboard. In most cases, how- LOW-PRESSURE STEAM TURBINES 325 ever, the demand for one kind of current will always predomi-nate, so that this sort of reversal is not likely to be application of a low-pressure turbine is illustrated inFig. 18if, where the steam engine drives a line of shafting througha belt drive and the low-pressure steam exhausted from theengine goes to a turbine generator unit supplying an electricaltransmission line. In this case the engine and the turbine musteach have a governor, as the loads on the two machines are en- Fig. i8if. Application of Condenser in Combination System. tirely unrelated. The device adopted in this case to make theplant as economical of steam as possible is to operate the enginein such a way that the excess of steam, above that required forthe low-pressure turbine, is discharged directly into the this method the engine will operate at times at a fairly goodvacuum as determined by the relative amounts of steam andabsolute pressures in lines A and B. The governor on the tur-bine operates only the by-pass valve V, regulating the flow of 326 THE STEAM TURBINE steam from the engine exhaust into the condenser. When theload on the turbine is light this valve will be nearly wide open,deflecting only a small amount of steam into the turbine; butwhen the turbine load gets near its full capacity, the condenserby-pass valve will be nearly closed. It bec
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