16
TR A N S FOR M E R BUS H I NG S T Y PE G S B 8 0 0
I N S TA L L AT I O N A N D M A I N T EN A N C E G U I D E
Bushing lifted over the
transformer/reactor
Upper draw-rod,
hanging by the
pull-through cord
Threaded sleeve for
connection between
upper and lower
draw-rod
Transformer/
reactor
Alternative 1: Standard
end-shield mounted on the
bottom contact adapter.
Alternative 2:
Standard end-shield
mounted on the
bottom contact.
Transformer/
reactor
Fixed stud bolts
CAUTION
The bushing must not be lifted by the insulator.
6. Remove the transformer cover from the transformer/
reactor, leaving the lower draw-rod connected to the
cables.
7. Carefully clean and inspect the oil-end below the
mounting flange before mounting on the transformer.
8. Place the bushing over the transformer/reactor and
connect the lower draw-rod with the upper draw-rod and
firmly tighten.
9. With the flexible pull-through cord fully tensioned, the
bushing is lowered into the transformer/reactor.
10. Fasten the bushing flange to the transformer/reactor,
and tighten according to the transformer/reactor
supplier’s specified torque, and remove the flexible pull-
through cord at the top of the bushing.
CAUTION
If fixed stud bolts are used on the transformer tank
for securing the bushing flange, it is recommended
that plastic sleeves be placed on two or three of the
studs in order to guide the bushing flange and to
prevent metal chips, which could fall down into the
transformer tank.
After tightening of
draw rod
Before tightening of
draw rod
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20 Two methods of assembling the end-shield.
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21 Installation of bushing into transformer/reactor.