Zakład Wytwórczy Aparatów Elektrycznych Sp. z o.o.
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3. INSTALLATION AND ADJUSTMENT
The disconnector is delivered partially assembled, as shown in the following figure.
The assembly is limited to:
a) assembling and leveling the base frame on the supporting structure,
b) assembling and setting of insulators,
c) assembling of movable contact head and fixed contact head,
d) assembling of corona rings,
e) assembling and coupling of the operating mechanism with disconnector,
f) earthing of the base frames and the operating mechanism.
3.1. Preparation of contact surfaces
The contact resistance of the connected elements depends primarily on the quality and cleanliness of the
contacting surfaces. Therefore, these surfaces should be prepared very precisely. The method of preparing of
aluminum, silver-plated and galvanized contact surfaces is shown below:
• aluminum – aluminium connection
The oxide layer should be removed from the contact surface by using a wire brush. After this treatment, the
surface should be matt gray, devoid of shiny areas. Any chips and aluminum dust should be thoroughly remo-
ved from the surface, eg by lubricating with acid-free petroleum jelly and then removing it. After this treatment,
the surface should be lubricated with acid-free petroleum jelly to protect it from oxidation of aluminum. Such
prepared surface should not be exposed to the interaction of the atmosphere longer than the time needed to
prepare the cooperating surface.
