TM 9-6115-604-34NAVFAC P-8-633-341No load2½ rated load3No load4½ rated load5No load6½ rated load7No load8½ rated load9¼ rated load103/4 rated load111/4 rated load123/4 rated load131/4 rated load143/4 rated load151/4 rated load163/4 rated load171/2 rated load184/4 rated load191/2 rated load204/4 rated load211/2 rated load224/4 rated load231/2 rated load244/4 rated load(d) Repeat steps (a) through (c), above, for 50 Hz operation.d.Results.(1)Prepare a chart for each load change giving the momentary overshoot or undershoot, and the recoverytime. For each constant load, give the maximum voltage variation.(2)Referring to Figure 12-9, begin by determining the observed (B), and steady-state (D) voltage bandwidths.(a)Numerically mark the stabilizations occurring after each load change, starting with the stabilizationobtained before the first load change.(b)Determine the observed voltage band with (B) by marking the maximum trace excursion andminimum trace excursion in the stabilized portion. Draw two lines parallel to the axis of the chartmovement, one each passing through these maximum and minimum trace excursions, respectively.(c)Draw a line (C) parallel to and equidistant from the edges of the observed voltage bandwidth,determined in step b, above.(d)Using the rated voltage of the generator, and the given requirements of Table 12-3, calculate thesteady-state voltage bandwidth (D). Draw this steady-state voltage bandwidth as two parallel lines,parallel to, and equidistant from, the median (C) at the observed voltage bandwidth.12-31
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