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c. Clean the sealing surface before installing the tap changer mounting flange. Place the sealing gasket on the
transformer mounting flange, and fix the tap changer mounting flange on the transformer’s (24 pieces of
M10 bolts, torque 100 to 110 N.m.). (see Figure-6-14)
Figure 6-14
d. Lift the tap changer slightly using the special sling strap. Make sure that all screws of the support flange are
accurately positioned in the tap changer fixing hole (see Figure-6-15).
e. Install the tap changer on the head mounting flange. Pay attention to the two positioning screws
(lengthened) and the red triangle marks on the support flange and tap changer head cover, so as to ensure
that the tap changer is installed in the correct position.
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