voltage connections if applicable.
From the oscillograms taken in 16-
18c(2)(d), determine the time between the
indicated closure of the short-circuiting
switch and the opening of the circuit
interrupter. See figure 512.1-II.
Calculate the short-circuit current using
ammeter reading prior to application of
the short circuit. See figure 512.1-II.
Tabulate the above results and the
malfunction indicator indication for each
connection and compare the results with
the requirements in table 16-1.
16-19. CIRCUITS INTERRUPTER TEST (OVERLOAD
General. A circuit interrupter is connected
between the generator voltage reconnection
system and the generator output terminals to
disconnect the generator output from the load
and to protect the generator from sustained
overload current. The circuit interrupter is
operated from a current sensor external to the
Apparatus. Instrumentation for measuring load
conditions and field voltage and current shall be
as described and illustrated in MIL-HDBK-705.
In addition, a stopwatch or an oscillograph with
noninductive shunt as described and illustrated
in MIL-HDBK-705. Method 106.1, paragraph
106.1.3 and galvanometers having a flat
frequency respond (within plus or minus 5
percent) from DC to 3,000 Hz.
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
for one voltage and frequency.
If the circuit interrupter fails to
operate within the time specified
in table 16-1 at any time during
the performance of this method,
interrupter and reduce the load
impedance to rated value before
reclosing the circuit interrupter.
Record on the data sheet the
operate and the total elapsed time
the overload was on the set.
Start and operate the generator set
at rated voltage, rated frequency,
and rated load.
Allow the generator set to stabilize
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
Adjustments to the load, voltage, or
frequency shall be noted on the
data sheet. Stabilization will be
considered to have occurred when
current readings of the exciter field
either remain unchanged or have
only minor variations about an
decrease in value after the last
adjustment has been made.