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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />7.5.1 Electrical Equipment <br />An induction generator is basically a standard induction <br />motor. However, by virtue of the turbine driving the motor shaft <br />slightly over its synchronous speed, electric power is generated <br />back into the utility power grid. Because the electro magnetic <br />excitation comes from the power grid, an induction generator can <br />only produce when paralleled or connected to the grid. <br /> <br />The selection of an induction <br />ancillary equipment can be simplified <br />maintenance. <br /> <br />generator means that <br />both in operation, cost <br /> <br />the <br />and <br /> <br />An induction generator will be supplied in a 445 TS frame <br />size. It will be rated for 110 kW, 1210 rpm and for use on a 480 <br />volt system. <br /> <br />The sizing is based on turbine efficiency, motor efficiency, <br />water head, and flow data. It is expected that the design ratings <br />would be encountered about 20% of the running time. The balance <br />of the running time is less than design rating except for extra- <br />ordinary water conditions when throttling of the flow may be <br />required by the inlet valve. <br /> <br />This is a 480 volt, 150 horsepower, 115% service factor <br />motor. Special attention will be required by the vendor for <br />design and balancing of the generator to run at double-rated speed <br />and for 8100 ft elevation. The expected ambient air temperature <br />will be less than 30oC. In addition a mechanical modification <br />will be required to couple and mount a centrifugal speed switch <br />device on the outboard shaft. <br /> <br />Surge <br />capacitor <br />generator. <br /> <br />voltage <br />will be <br /> <br />protection consisting of a MOV arrestor and <br />mounted at the terminals of the induction <br /> <br />7.0-16 <br />