MIL-STD-705C
302.1.3.2 Test.
a. Turn on the test apparatus in accordance with the manufacturer's
instructions, after making sure that the initially aplied voltage will
not be greater than 600 volts.
b. The test voltage shall then be raised approximately uniformly to the
required value. This increase shall be accomplished in not less than 10
seconds nor more than 30 seconds. Unless otherwise specified in the
Procurement document, the maximum test voltage for power output windings
shall be equal to 1,000 volts plus twice the highest rated voltage of the
generator. The test voltage for field windings shall be equal to 10 times
the exciter ceiling voltage but in no case less than 1,500 volts nor more
than 3,500 volts. Record on the data sheet the maximum voltage reached
during this method (see figure 302.1-I).
c. Apply the maximum voltage for 1 minute. Record the voltage applied,
including any breakdown in insulation observed.
d. After 1 minute the voltage shall be reduced gradually to the voltage
initially applied. This reduction shall not be accomplished in less than
5 seconds.
e. Turn off the test apparatus.
CAUTION: Ground the high voltage lead of the test apparatus to make sure that no
charge remains on the windings which have been under test.
Remove the high voltage lead from the winding and proceed with the tests
f.
of the remaining circuits to be tested. Make sure that all the circuits
not under test are securely grounded.
After test is completed, reconnect all circuits to original configuration.
g.
Results. Compare the results with the procument document
302.1.4
requirements.
302.1.5 Procment document requirements. The following items must be specified
in the individual procurement document:
Test value of applied voltages, if different than those specified in
a.
302.1.3.2.
Windings to be tested, other than those specified in 302.1.3.
b.
c.
Definition of insulation breakdown.
Method 302.1b
2
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