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Tap Changer Drive Mechanism Installation
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TM-5-6120-250-34 Substation Trailer Mounted 500 KVA AC 4160-416Y/240V 208Y/120V 3 Phase 50/60 Hertz Avionics Model 950-2200A Manual
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Figure 5-1. Stored-energy manual closing mechanism
CHAPTER 5
REPAIR OF LOW VOLTAGE SECTION
Section I. LOW VOLTAGE CABINET
boards. The transition area covers the direct connections
5-1.General
from the transformer.
The low voltage cabinet is a weatherproof housing with
5-2. Enclosure Inspection and Repair
two full height doors at front and rear and a transition area
a. Inspect exterior and interior for dents, holes,
with a rear access panel. The cabinet (contains totally
enclosed compartments for four circuit breakers and two
scratches, bends, panel and door alignment, weather
instrument sections, with their hinged panels and controls
seals and other damage.
accessible behind the front doors. The rear doors give
b. Inspect interior for loose or missing hardware and
access to the section housing the buses, bus supports and
door and panel latch mechanisms. and properly secure
)breaker connections.  The cabinet has built in wire
them.
troughs for the 115 volts ac interconnections to the
c.  Straighten dents and bends, align panels and
compartment lights, three heaters (two in low cottage in
doors. Fill holes, clean, prime, and repaint bare metal.
high voltage) and switch, convenience outlet,
Cement loose weather seals; replace if damaged.
fuses and interconnecting terminal
Tighten loose hardware; replace if missing.
Section II. SAFETY DEVICES
5-3. Restraining of Contact Closing Springs
(4)  Complete the last clockwise or fourth stroke.
a
Insertion of Safety Pin.
b. Removal of Safety Pin.
(1)  Operate the closing handle 122, fig.  5-11
(1)  Operate the closing handle (221 three and
three and one half complete cycles.
one half complete cycles.
(2)  At the end of the fourth counterclockwise
(2)  At the end of the fourth counterclockwise
stroke and before performing the fourth clockwise stroke,
stroke and before performing the fourth clockwise stroke,
remove the safety pin (3) from its clip holder 12).
remove the safety pin (31 from the hole (4) in the guide
(3)  Insert the safety pin 13) into the hole (41
rod.
near the top in the guide rod. This hole is just above the c
(3)  Place pin in its clip holder (21.
losing springs (5 i that are around the guide rod l)hl. The
(4)  Complete the last clockwise or fourth stroke.
inserted pin thus prevents the closing springs from their
The breaker will then close.
energy and closing the breaker contacts.
5-1

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