TM 5-6115-593-34NAVFAC P-8-631-34TO-35C2-3-463-2not necessary to record line-to-line voltages). Each load condition shall be applied to the generatorset in one step at the end of the short-term stability period for the previous load condition. The loadconditions are:1.No load2.1/2 rated load3.No load4.1/2 rated load5.No load6.1/2 rated load7.No load8.1/2 rated load9.Rated load10.1/2 rated load11.Rated load12.1/2 rated load13.Rated load14.1/2 rated load15.Rated load16.1/4 rated load17.3/4 rated load18.1/4 rated load19.3/4 rated load20.1/2 rated load21.3/4 rated load22.1/4 rated load23.3/4 rated load(d)Repeat (a) through (c) for all voltage connection(s) and frequency(ies).d.Results.(1)Prepare a chart giving for each load change the momentary overshoot or undershoot and the recoverytime. For each constant load, give the maximum voltage variation.(2)Referring to figure 16-1, begin by determining the observed (B) and steady-state (D) voltage bandwidths.(a)Mark numerically the stabilizations occurring after each load change, starting with the stabilizationobtained before the first load change.(b) Determine the observed voltage bandwidth (B) by marking the maximum trace excursion andminimum trace excursion in the stabilized portion. Draw two lines parallel to the axis of chart movement,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 (b) above.(d) Using the rated voltage of the generator and given requirements of table 16-1, calculate thesteadystate 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.(3)To determine the maximum voltage variation at constant load:(a) One-half the observed voltage bandwidth (B) is the plus or minus value of voltage deviation atconstant load.16-10
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