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Installation and commissioning guide
1ZSC000563-AAF EN, REV. 4, 2021-06-23
4.9 Grounding of the bushing flange
Overview
The bushing flange must be grounded to the transformer tank. This prevents electrical discharge between the
bushing flange and the transformer tank under normal service conditions.
DANGER!
Make sure that the grounding is correct. An unsatisfactory grounding can cause damage to
equipment, or death to personnel.
Procedure with a flexible cable
1. Clean the contact surfaces.
2.
Put a flexible cable (64) between the grounding
hole in the bushing flange and a grounding point
on the transformer.
G006973
3.
Apply a large quantity of Mobilgrease 28 to the bolt (50).
CAUTION!
The quality of the bolt is important, stainless steel of A4-80 quality is recommended.
NOTE!
Or use a lubricant similar to Mobilgrease 28.
4.
Install the bolt (50).
Torque
M12: 40 Nm
5.
Connect the other end of the flexible cable (64) to the transformer.
NOTE!
This makes an electrical connection between the bushing and transformer tank, keeping
them at the same potential.
End of instruction
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