6-9. Cleaning, Inspection, and Testing.
a. Cleaning. Clean all components with a cloth
dampened in cleaning solvent, Federal Specification
P-D-680.
b. Inspection. Refer to Operator and Organiza-
tional Maintenance Manual.
c. Testing.
—
(1) To test CTl, CT2, and CT3 on either Mode
I or Mode II sets, proceed as follows:
(a) Wrap 10 turns of a conductor around the
coils of cm.
(b) Apply an ac current of 10 amperes to
the conductor.
(c) The current measured at terminals Al
and A2 must be 360 ma.
(d) Repeat steps (a) through (c) on CT2 and
CT3. Measure CT2 at terminals B1 and B2; meas-
ure CT3 at terminals Cl and C2.
(2) To test CT4, CT5, and CT6 on either Mode
I or Mode II sets, proceed as follows
(a) Apply 20.7 volts (rms) 60 Hz across
terminals l and 3.
(b) Voltage between terminals 1 and 2 shall
measure 16. 5 ± 1 percent Vac.
(c) Excitation current shall be less than
36 ma.
(d) Apply 50 amperes 60 Hz through 1
primary turn.
Secondary current should be 180 ma
± 1% at terminals 1-3.
(3) To test CT7 on Mode II sets, proceed a
follows:
(a) Apply 15 volts (rms) 400 Hz across,
terminals 1 and 2.
(b) The excitation current shall be less than
45 ma (rms).
(c) Apply 50 amperes 400 Hz through 1
primary turn.
Secondary current should be 250 ma
± 1%.
(4) To test CT7 on Mode I sets, proceed as
follows:
(a) Apply 15 volts (rms) 60 lb across ter-
minals 1 and 2.
(b) Excitation current shall be less than
60 ma (rms).
(c) Apply 50 amperes 60 Hz through 1
primary turn.
Secondary current should be 250 ma
± 1%.
6-10.
a.
b.
c.
6-11.
Repair.
Replace defective current transformers.
Replace worn grommets.
Replace all gaskets with new ones.
Reassembly and Installation.
a. Reassembly
See figure 6-4 and reassemble
the current transformer assembly.
b. Installation. See paragraph 6-8 and install the
current transformer assembly.
6-8 Change 1
