Why we using Copper aluminum bimetallic washer ?
Why Copper aluminum Bimetal at transition joints?
It is known that when the Aluminium Terminals are directly connected to Copper Terminals to carry current at a high voltage, a bimetallic galvanic corrosion occurs, resulting in a high resistance at the joint. The heated joints are oxidized and loses contact resulting in sparks, voltage dropout power losses and failure, damage to machinery.
When Copal bimetal is placed as a transition plate between Aluminium Terminal and Copper Terminal at the joint (with Copper facing Copper and Aluminium facing Aluminium), bimetallic galvanic corrosion is averted due to absence of air in Copper aluminum bimetal. Copper aluminum bimetallic  is thus used at dissimilar metals joints of Aluminium and Copper to make similar metal's contact.
Copper aluminum bimetal  has been successfully evaluated and used by many of the world's leading electrical equipment manufacturers.
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