Zakład Wytwórczy Aparatów Elektrycznych Sp. z o.o.
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3. INSTALLATION AND ADJUSTMENT
The delivered disconnector is completely regulated and ready to work. Installation is reduced to:
a) installing poles on a supporting structure,
b) attaching supporting constructions for the operating mechanisms,
c) installing of operating mechanisms,
d) poles coupling and its regulation,
e) earthing switches coupling,
f) earthing switches regulation,
g) grounding the base frame and the operating mechanism.
3.1. Preparing contact surfaces
The contact resistance of touching each other elements depends primarily on the quality and cleanliness of
the contacting surfaces. These surfaces should be very precisely prepared. The method of preparing alumini-
um and silver contact surfaces is described below:
• aluminium – aluminium connection
the oxide layer from the contact surface should be removed by using a wire brush. After this treatment, the sur-
face should be matt gray, devoid of shiny areas. Any chips and aluminum dust should be thoroughly removed
from the surface, eg by lubricating with acid-free grease and then removing it. After this treatment, the surface
should be greased with acid-free grease to protect it from oxidation of aluminum. The prepared surface should
not be exposed to the atmosphere longer than the time needed to prepare the cooperating surface.
• Copper – silver connection
The copper surfaces should be cleaned of oxides by using a brass wire brush and then should be proceeded
as for the aluminum surface. Silver surfaces do not need to be cleaned with a brush, but they can be cleaned
with a delicate abrasive material, eg steel wool. After cleaning the surface should be covered with a thin layer
of acid-free grease.
