TM 5-6115-465-34
T0 35C2-3-446-2
NAVFAC P-8-625-34
TM06858B/06859D-34
(f) Adjust the terminal voltage to the
varying the regulated voltage throughout the limits
and under the various load conditions and tempera-
maximum specified value.
ture ranges without causing the voltage droop of the
set to exceed specification limits. The voltage ad-
(g) Record all instrument readings.
just device also must be capable in some cases of
providing an operating voltage other than rated volt-
NOTE
age for special types of equipment and to compen-
sate for external line drop.
At voltages above rated values, the gen-
erator will be supplying less than rated
b. Apparatus. Instrumentation for measuring
current; and at voltages below rated
load conditions, ambient temperature, and the gen-
values, the generator will be supplying
erator field (or exciter field) voltage and current
greater than rated current. Caution
shall be as described and illustrated in MIL-HDBK-
should be taken to avoid damage to in-
705.
strumentation and load banks.
c. Procedure for Test.
(h) Apply rated load (rated kW at rated
power factor).
(1) Preparation for test.
(i) Record all instrument readings (after
(a) Connect the load and field instrumen-
transients have subsided).
tation in accordance with the applicable figure of
MIL-HDBK-705, Method 205.1, Paragraph 205.1.10
(j) Remove load and adjust voltage to the
for one voltage and frequency.
maximum attainable value or to a value just prior to
actuation of the overvoltage protection device.
(2) Test.
NOTE
(a) Start and operate the generator set
and allow the set to stabilize at rated load, rated
The output voltage may exceed the rating
voltage and rated frequency. During this period
of connected equipment.
record all instrument readings including thermal in-
strumentation at minimum intervals of 10 minutes.
(k) Record all instrument readings (after
If necessary, adjustments to the load, voltage and
transients have subsided).
frequency may be made to maintain rated load at
rated voltage and frequency. Adjustments to the
(l) Apply rated load..
voltage and frequency may be made to maintain rated
load at rated voltage and frequency. Adjustments to
(m) Record all instrument readings
the voltage and frequency shall be limited to those
(after transients have subsided).
adjustments available to the operator, specifically
adjustments to the voltage or frequency adjust de-
(n) Adjust voltage to the minimum speci-
vices. On sets utilizing a droop type speed control,
fied value at rated load.
system as the prime speed control, the speed and
droop portions of the control may be adjusted. No
(o) Record all instrument readings (after
other adjustments to the voltage and frequency con-
transients have subsided),
trol systems shall be made. Adjustments to load,
voltage or frequency controls shall be recorded on
(p) Remove load.
the data sheet at the time of adjustment. Stabilization
shall be considered to have occurred when four con-
(q) Record all instrument readings (after
secutive voltage and current readings of the genera-
transients have subsided).
tor (or exciter) field either remain unchanged or
have only minor variations about an equilibrium con-
(r) Adjust voltage to the minimum attain-
dition with no evident continued increase or decrease
able value or a value just prior to activation of the
in value after the last adjustment to the load, volt-
under voltage protection device.
age, or frequency has been made.
(s) Record all instrument readings (after
(b) No further adjustments shall be made
transients have subsided).
to any set control for the remainder of this test ex-
cept the control panel voltage adjust device.
(t) Repeat steps (a) through (s) above for
all other voltage connections ).
(c) Record all instrument readings.
d. Sample Calculations. Regulation (droop) is
defined for the purposes of this method as the no-
(d) Remove load.
load value minus the rated load value divided by the
(e) Record all instrument readings (after
rated load value the quantity expressed in percent.
transients have subsided).
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