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Section VI. MAINTENANCE OF TRANSFORMER
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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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Figure 3-7. Tap changer. cont'd
ME 6120-250-12/3-7
1.
Cap
2.
Drive mechanism
3.
Slot in indicator cam
4.
Bolts, hex head
Figure 3-7. Tap changer.
With the cover removed check or change terminal
WARNING
connections according to the tables on the name plate
Before removing a terminal board cover,
for high and low voltage terminal connections and
vent  the  transformer  to  atmospheric
voltages.
pressure. See following subparagraph h.
g. To replace the covers perform removal steps
f. Terminal boards for the high voltage and low
in reverse order. The gasket can be reused many times
voltage connections are located under the oval shaped
if not damaged. Thoroughly clean the gasket surfaces.
covers on the top. (fig. 3-8). These covers must be
Although no stickers are required, the compound
removed to make connection changes on the terminal
furnished with or for the gaskets may be used to hold
boards. To remove these covers loosen and remove
them in place during assembly. After replacing gasket,
the 12 nuts securing it to the top.  Then remove the
cover and nuts, tighten the nuts to coin press the gasket
cover taking care not to damage gasket.
approximately one-third, or to
3-12

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