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Figure 2-16. Circuit breaker 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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CHAPTER 4 REPAIR OF TRANSFORMER
CHAPTER 3
REPAIR OF HIGH VOLTAGE SECTION
Section I. HIGH VOLTAGE CABINET
3-1. General
seals or replace damaged one, tighten loose hardware or
The high voltage cabinet is a weatherproof housing with
replace any that is missing. Replace broken
two hinged front panels (upper and lower), two removable
or cracked insulating barriers and cable supports.
rear panels (upper and lower), and a transition area. The
cabinet houses the load break switch in upper front
3-3. Inspect and Replace Lightning Arresters
section, three lightning arrestors and a heater in lower
a. Inspect.
front section. The rear panels allow access for connecting
the primary conductors up and through the bottom to the
CAUTION
connectors on rear of load break switch. The transition
Lightning arresters are live equipment. No
area provides a housing for the connections to the
work should be done or contact made with
primary sides of the transformer from load break switch,
them while the line is energized.  (Current
with access panels front anti rear. All panels are secured
flows through an arrester from line to
with hex head bolts. The front upper panel allows for a
ground. A potential gradient exists that is
visual inspection through  two non-reflecting  windows,
hazardous if handled while energized.
and operation of switch with panel closed.  The switch
operating handle socket is covered and has a lockable bar
(11)
Inspect insulator for damage caused by
to prevent unauthorized switching.
external flashover. If cracked or burned, replace.
(12)
Inspect for damage to apparatus protected
3-2. Enclosure Inspection and Repair
by or near arrestor.
a. Inspect exterior and interior for dents, holes,
b. Replace. Refer to figure 2-13.
scratches, bends. panel alignment, weather seals
CAUTION
and other damages.
Make sure lines are de-energized, and load
b. Inspect interior for loose or missing hardware,
breaker switch and main circuit breaker are
broken or cracked cable supports or insulating
open.
barriers.
(1) Remove line connection at top of arrester.
c.  Straighten dents and bends, fill holes, clean,
(2) Remove ground connection on bottom of arrester.
prime and repaint bare metal, cement loose weather
(3) Loosen nut of clamp holding arrestor, and remove
arrestor.
(4) Replace or install in reverse order.
Section II. LOAD BREAK SWITCH
auxiliary blade.  When  the  switch  is opened  the
3-4. Load Break Switch Inspection and Repair
auxiliary blades contacts are the last to part and will
a. Description.  The  load  break  switch is a
initiate all arc in the chute. The hot arc releases gases
manually operated, triple pole disconnecting switch with
from the last plastic chute in such volume that the arc is
an  integral  interrupter  that  has  the  capability  of
blown away from the rapidly moving auxiliary blade and
interrupting transformer magnetizing and load current
cooled by contact with the larger area of tine chute sides.
within its rating. It has a manually charged, spring stored
After the  arc has been extinguished, the blade  will
energy operating mechanism capable of closing the
continue to open producing a  sufficient  air  gall  to
switch against maximum rated short circuited current.
isolate the  termiillali
The operation of the switch is accomplished by manual
rotation of the detachable operating handle through an arc
(b) Switch Inspection Refer to TM 5-6120-250-12.
of 180 The switch has a positive closing and opening
.
1 2.
operation supplied from the stored energy of springs. The
(c) Switch Repair Refer to Checks and Adjustment
interrupting ability of the switch is accomplished by the
use  of  an  arc  chute  type  interrupter  and  an
3-1

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