MTD 464 Betriebsanleitung PDF herunterladen (Seite 389)

ARMY TM 9-6115-464-34

AIR FORCE TO 35C2-3-445-2

NAVY NAVFAC P-8-624-34

of this test. At each of the following load conditions (one step) operate the set for a minimum of 40

seconds (or the short-term stability period plus the allowable recovery time as specified in the

procurement document). During each load condition read and record all instrument readings except

thermal instrumentation (for three-phase sets it is not necessary to record line-to-line voltages).

Each load condition shall be applied to the generator set in one step at the end of the short-term

stability period for the previous load condition. The load conditions are:

1. Rated load

2. No load

3. Rated load

4. No load

5. Rated load

6. No load

7. Rated load

8. No load

9. 3/4 rated load

10. No load

11. 3/4 rated load

12. No load

13. 3/4 rated load

14. No load

15. 1/2 rated load

16. No load

17. 1/2 rated load

18. No load

19. 1/2 rated load

20. No load

21. 1/4 rated load

22. No load

23. 1/4 rated load

24. No load

25. 1/4 rated load

26. No load

27. Rated load

28. No load

29. Rated load

30. No load

31. Rated load

32. No 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

recovery time. For each constant load, give the maximum voltage variation.

(2) Referring to figure 4-1 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 stabilization

obtained before the first load change.

(b) Determine the observed voltage bandwidth (B) by marking the maximum trace excursion and

minimum 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.

Determined in (b) above.

(d) Using the rated voltage of the generator and given requirements of table 4-1, calculate the

steady-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.

4-12

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MTD 464 Betriebsanleitung Seite 389

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