ARMY TM 9-6115-60412
NAVY NAVFAC P-8-633-12
(3)
Connect a 500 V dc megohmmeter to either primary tap (H1 or H2) and to ground. Operate the
megohmmeter for 60 seconds and observe resistance. Reading should not be less than 10
megohms.
(4)
Connect the 500 V dc megohmmeter to either secondary terminal X1 or X3 and ground. Operate the
megohmmeter for 60 seconds and observe resistance. Reading should not be less than 10
megohms.
(5)
Connect the 500 V dc megohmmeter between the primary and secondary windings. Operate the
megohmmeter for 60 seconds and observe resistance Reading should not be less than 10 megohms.
(6)
If transformer fails any test described above, refer to the next higher level of maintenance.
(7)
Reconnect wires and remove tags.
4-140. GROUND FAULT TRANSFORMER T100. See Figure 3-26 GROUND FAULT transformer T100 is located in
generator control cabinet A and is used for ground fault sensing in conjunction with GROUND FAULT protection relay
K115.
Dangerous voltage levels may be present at components located within cabinet C.
Observe all applicable safety precautions as outlined in Chapter 1, Section III , of
this manual.
a.
Test.
(1)
Tag and disconnect wiring from the ground fault transformer T100
(2)
With multimeter set to RX1 scale perform individual continuity checks on transformer primary and
secondary windings.
(3)
Connect a 500 V dc megohmmeter to either primary lead and to ground Operate the megohmmeter
for 60 seconds and observe resistance. Reading should be not less than 10 megohms.
(4)
Remove megohmmeter from primary and connect to either secondary lead and to ground. Operate
the megohmmeter for 60 seconds and observe resistance Reading should be not less than 10
megohms.
(5)
Connect the megohmmeter across primary and secondary transformer windings. Operate the
megohmmeter for 60 seconds and observe resistance. Reading should be not less than 10
megohms.
(6)
If GROUND FAULT transformer T100 fails to pass any test described above, refer to the next higher
level of maintenance.
(7)
Reconnect wires and discard tags.
4-141. VOLTAGE REGULATOR TRANSFORMER T102. See Figure 3-26 VOLTAGE REGULATOR transformer T102
provides voltage Input for current boost system A101 and voltage regulator VR101.
Dangerous voltage levels may be present at components located within cabinet C.
Observe all applicable safety precautions as outlined in Chapter 1, Section III , of
this manual.
a.
Test.
(1)
Tag and disconnect wiring from VOLTAGE REGULATOR transformer T102.
(2)
With multimeter set to RX1 scale, individually check continuity on the primary and secondary
windings. The readings should be:
H1 to H2......................127 ohms
H1 to H3 ......................297 ohms
H2 to H3......................169 ohms
Secondary windings.....0.006 ohms
4-201
