32
UniGear ZS1
I N S T A L L A T I O N , O P E R A T I O N A N D M A I N T E N A N C E
5.7 Installation of the busbars
Access to the busbars is possible either from
above after the pressure relief plate has been
removed, or from the front of the circuit-breaker
compartment. To get at the busbars from the
circuit-breaker compartment, first withdraw the
circuit breaker and then remove the horizontal
partition. Once this has been completed, the
following steps should be taken:
•
Install the bushings
•
Clean the insulation on the busbar sections
with a soft, dry cloth and check for insulation
damage. Remove any grease or adhesive dirt
•
Busbar connections
•
The silver plated surfaces of the connections
must be cleaned with a metal-free non-woven
cleaning cloth, and thinly and evenly coated
with Syn-Setral-EK 339 grease
•
The non-silver plated surfaces of the connections
are either brushed with a wire brush, to preserve
the grease film, or cleaned with a metal-free
non-woven cleaning cloth and evenly greased
with a thin coat of Syn-Setral-EK 339
•
Prepare the shield covers and install them to
the busbar and T-off bar joint, to cover the
screws
•
Install the busbars panel by panel. Screw on
the individual busbar elements one above the
other (depending on the system layout) and
in line with the branch conductor. Use the
hexagonal socket head screws provided. See
the table in section 5.3 for the correct tightening
torque. Use two dished washers for each screw
Note:
The busbars are connected using so-called
“stabilized connections”. This means the quality
of the copper busbar connections does not change
irrespective of operating time and therefore
regular inspection of the tightness of the busbar
connections is unnecessary. However, this is on
condition that switchgear assembly is carried out
exactly as described above and that all connections
are tightened with the prescribed torque according
to the table in section 5.3.
We recommend that the tightness of the busbar
connections are inspected during repairs only.
29 Busbar bushing
58 Shield cover
—
Figure 40 Installation of the busbars and the installation at the busbar ends