TM 5-6115-593-34
NAVFAC P-8-631-34
TO-35C2-3-463-2
c.
Procedure
(1)
Preparation for test. Connect the load
and field instrumentation in accordance
with the applicable figure of MIL-HDBK-
705, Method 205.1., paragraph 205.1.10.
(2)
Test.
(a)
Start and operate the generator set
and allow it to stabilize at rated
load,
rated
voltage,
and
rated
frequency. During this period,
readings of the load and field
instrumentation shall be recorded at
minimum intervals of 10 minutes. If
necessary, adjustments to the load,
voltage, and frequency may be
made to maintain rated load at
rated voltage and rated frequency.
However, adjustments available to
the
operator,
specifically
adjustments
to
voltage
and
frequency
adjust
devices.
Adjustments to the load, voltage or
frequency shall be noted on the
stabilization
data
sheet.
Stabilization will be considered to
have
occurred
when
four
consecutive voltage and current
readings of the exciter field either
remain unchanged or have only
minor
variations
about
an
equilibrium
condition
with
no
evident
continued
increase
or
decrease in value after the last
load,
voltage,
or
frequency
adjustment has been made.
(b)
No further adjustments shall be
made to any set control for the
remainder of this test except for the
control
panel
frequency
adjust
device.
(c)
For each of the conditions in the
following steps allow approximately
2 minutes between each adjustment
and
the
subsequent
instrument
readings.
(d)
Adjust the generator set frequency
for
the
specified
minimum
frequency at rated load. Read and
record all instrument readings.
(e)
Reduce the load to zero.
(f)
Adjust the generator set frequency
for
the
maximum
attainable
frequency. Read and record all
instrument readings. If the over-
frequency or overspeed protection
device actuates, read and record all
instrument readings just prior to the
point of actuation and note on the
data
sheet
that
the
protection
device actuated.
NOTE
This step is not applicable to
generator sets having governors
that utilize a threaded shaft and
locknut(s) or other mechanical
means as a method of operator
speed adjustment.
(g)
Adjust the generator set frequency
for
the
minimum
attainable
frequency. Read and record all
instrument readings.
(h)
Repeat 16-16c(1) and 16-16c(2)(a)
through (e) for each frequency.
d.
Results. The data sheet shall show the
maximum and minimum frequencies attained at
rated
load,
the
maximum
and
minimum
attainable frequencies at no load and actuation
of
the
protection
devices
(if
applicable).
Compare these results with the requirements of
table 16-1.
16-13