exp 59

Exp 59 - Experiment 59 Alternator Power To observethe effect of DCexcitation uponthe power deheredby an altemator To observe the effect of power

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Experiment 5 9 Alternator Power To observe the effect of DC excitation upon the power dehered by an altemator. effect of power delivered by altemator upon the toque of the prime mover. Apart from portable or mobile engine driven AC attemators operating In remote areas or for emergency use, most AC generators feed into large electrical distribution networks where the frequency and voltage have been established by other generators operating in the system. Alternators are then said to feed into an "infinite buss", meaning iiterally, a large electrical distribution system of tremendous power. The existi frequency and voltage of this infinite buss cannot be altered by addition any incoming alternator. The incoming alternator will have a constant flux in its air-gap because of the fixed- voltage of the "infinite buss" it is connected to. The flux is normally produced by the rotor current and/or the AC currents in the stator, Shoold the current be less than that needed to produce the required flw, then the stator must supply the difference by drawing lagging reactive power from the infinite buss. Conversely, il mtor current is larger than required, the stator will draw leading reactive power from the infinite buss, and the alternator looks like a capacitor. Changing the exciition of an aftemator tha.t is Ved" into an infinite buss can only cause it to exchange more or less reactive power with the infinite buss. An alternator can deliver active power (watts) to an infmite buss by forcing its mtor to move ahead of its normal no-load position. Mechanical torque must be exercised to attain and keep this advanced rotor position. The torque multiplied by the speed is a measure of mechanical power which the alternator receives and,
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This note was uploaded on 09/29/2008 for the course EEE 360 taught by Professor Gorur during the Spring '08 term at ASU.

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Exp 59 - Experiment 59 Alternator Power To observethe effect of DCexcitation uponthe power deheredby an altemator To observe the effect of power

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