experiment 5

experiment 5 - Introduction Synchronous generators are...

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Introduction Synchronous generators are synchronous machines used to convert mechanical power to ac electric power. In this experiment we were instructed to perform open and short circuit tests for the synchronous generator. The open and short circuit tests are used to determine certain quantities that define a synchronous generator. These quantities are the relationship between flux and field current, the armature resistance and the synchronous reactance. This lab served as an introduction to saturation curves produced for a 3-phase synchronous machine. For the open circuit test we ran the generator at rated speed with no loads attached, I f =0. We gradually increased I f in steps, while measuring V phase (Ea=V phase since no load). We expected the curve to be almost linear until it reached saturation. To perform the short circuit test we set I f =0 and measured I a as. I f is increased, and we short circuited the 3-phase terminals of the AC machine. The graph of I a vs. I f was expected to be linear. Purpose
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experiment 5 - Introduction Synchronous generators are...

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