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Connecting Primary Cable
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TM-5-6120-250-12 Substation Trailer Mounted 500 KVA AC 4160-416Y/240V 208Y/120V 3 Phase 50/60 Hertz Manual
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Section III. CONTROL AND INSTRUMENTS
of the low voltage output is made on the terminal board
WARNING
in top of transformer. Remove the terminal board cover
Never apply power to trailer unit
and connect terminals as shown in L winding table on
before making sure unit is grounded
transformer nameplate for the desired voltage.  See
and connections are tight.
2-5. Voltage Conversion.
b.
Voltage Ratio Change. The transformer
WARNING
is provided with a wedge-type tap changer to change
Never  make voltage changes with
voltage ratio without breaking the transformer seal to
transformer
energized.
Serious
make this change, see paragraph 3-12 d.
perpersonal injury and/ or damage to
the transformer may result.
a.
Low Voltage Change. This conversion
Section II. MOVEMENT TO NEW WORK SITE
cabinet.
2-6. Dismantling for Movement
(19)
Close and secure the two trap
a.
Preparation for Movement.
doors underneath the low voltage cabinet in trailer bed.
(1) Push trip button (5, fig. 2-11) on main
(20)
Make sure the 3 ammeter,
breaker in low voltage cabinet.
voltmeter, heater and light switches are in off positon.
(2)
Push
trip
button
feeder
(21)
Move main and feeder breaker
breakers. 15 fig. 215)
to the full racked in position and tripped.
(3) Using switch operating handle, turn load
(22)
Close and secure both front
break switch to off.  Make a sight inspection through
doors of low voltage cabinet.
window ( 1 ,fig. 2-1 ) of high voltage cabinet to make
(23):
Disconnect  the  ground  wire
sure switch is open. Return switch operating handle to
from the ground rod and stow it.
storage cabinet.
(24)
Remove the ground rods and
(4) Place bar (4) in bracket to cover the
stow on the deck.
operating handle socket (3) and lock with padlock.
(25)
Remove guardrail and access
(5) Check and make sure power source has
ladder. Stow ladder on forward deck, guardrail and chain
been turned off to this substation.
in storage cabinet.
(6) Remove primary cables at the power
(26)
Check that all panels have been
source, and feeder lines.
replaced and doors secured on all cabinets.
(7) Remove upper and lower rear panels of
(27)
Trailer is now ready to be
the high voltage cabinet.
connected to its prime mover. Connect electrical leads
(8) Disconnect
the
three
primary
and air hose into trailer, raise the landing gear to full up
conductors from the load break switch ( 1, fig.  2-4).
position.
Disconnect the fourth conductor from ground lug (4) at
(28)
Check brake air pressure and
the left bottom .
charge system if needed. Remove wheel blocks.
(9) Until primary cable and ground wire
b.
Movement.  The  trailer should  be
down and out (of cabinet.
moved according to Army standards for trailers.
(10)
Close the trap door (3) and
2-7. Reinstallation After Movement
secure with its bolt. Replace cabinet bottom cover (5).
a.
Reinstallation. Refer to paragraph 2-4,
(11)
Replace upper and lower rear
panels of high voltage cabinet.
Installation or Setting Up Instructions.
(12)
Replace primary cable on its
b.
If Trailer is Stored or Parked.
cable reel on rear 4 of trailer and secure with tie to drum
(1)  Connect the 115 VAC power cord to a
side.
115 VAC supply.  Turn heaters and
(13)
Open rear doors of low voltage
lights on.
cabinet and disconnect feeder cables from the three
(2)  Make sure transformer liquid is at
feed breakers .
proper level. Add dry nitrogen in gas
(14)
Replace feeder cables on their
space until the pressure reaches 3
cable reels on rear of trailer, secure with tie to drum
psi.
side, engage the drum lock bar.
NOTE
(15)
Turn light and heater switch to
Transformer stored as spares should
of! position.
be maintained in the same condition
(16)
Disconnect 115 V service from
as if in service.
Make periodic
its power source and pull cables on hangers inside left
inspections of liquid level.
Check
of right rear door of loss voltage cabinet.
pressure gage to make sure seal is
(17)
Disconnect ground wire in right
being maintained.
bottom of low voltage cabinet.
(18)
Close and secure rear doors of
2-8

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