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De-energize the transformer before operating the Tap Changer.
Verify that the tap changer is in a correct and firmly position preventing any
unwanted displacement.
figure 8-15 Tap changer
8.8 Oil Level Indicator
Oil level gauge is a device that has a float that is in direct contact with the insulating liquid,
and it allows to know which is the nominal level, minimum level and maximum level allowed
in the transformer operation.
User Manual 8 Components and Accessories