I N S T A L L A T I O N O F T H E S W I T C H G E A R A T S I T E
45
—
Fig. 2.3.6.1 Position of
damping resistors
above the low voltage
compartment
—
Fig. 2.3.6.2 Example of
a damping resistor -
Marking of the taps
2.3.6 Installation of damping resistors
Damping resistors, if required, are usually installed
on site above the low-voltage cabinet (fig. 2.3.6.1).
Wiring of the damping resistors
The damping resistors have several taps. The
clamps of the taps are marked with resistance
values in ohms (Fig. 2.3.6.2). Take the required
resistance from the circuit diagram and connect
the damping resistor according to the wiring
diagram.
Attach the damping resistor according to the
supplied assembly drawings.
Resistor
—
Fig. 2.3.6.1
Tube type resistor
Rod type resistor
—
Fig. 2.3.6.2
2.3.7 Fitting the cover plates
Fit the rear cover plate (for free-standing
installation), the busbar cover and the end covers
as shown in the installation drawings supplied with
the switchgear.
2.4 Connecting the main earthing bar
•
Connect the main earthing bar to the station
earth.
Details of the cross section and the
number of connections can be found in
the earthing diagram (not included in
ABB’s scope of supply).
2.5 Connection of cables and wiring
2.5.1 Control cables and wiring
Carry out the laying and connection of external
control cables and the earthing of the cable screens
of external control cables in accordance with the
accepted EMC rules (EMC = electromagnetic
combability).
•
Establish the panel to panel connections of the
control wiring. The panel to panel connections
are of the plug-in type.
•
The cable entry for external control cables and
wiring is located in the roof plate of the low
voltage compartment or in the floor plate of the
cable termination compartment.
Cable entry in the roof plate of the low voltage
compartment
•
Route the external control cables and wiring
through the roof plate using reducer rings and
connect them as shown in the circuit diagram.
Cable entry in the floor plate of the cable
termination compartment
•
Dismantle the left-hand secondary cable duct in
the cable termination compartment. Using
reducer rings, route the external control cables
and wiring through the opening between the
cable termination compartment and the
operating mechanism bay, and through the
opening between the operating mechanism bay
and the low voltage compartment, and connect
them as shown in the circuit diagram.
2.5.2 High-voltage cables
The high-voltage cables are installed after
completion of the high-voltage test on the busbar.
•
Dismantle the cable mounting rails and floor
plates in the cable termination compartments.
Remove the cable bushings from the floor plates.
•
Lay the high-voltage cables to the panels in
accordance with the project planning.
Ensure that the phase positions of the
cables are correct!
•
Slide the cable bushings onto the cables.
•
Connect the cable connectors to the cables in
accordance with the manufacturer’s instructions.
Checking the outer cones
Check the outer cones for damage. If
there is damage to the outer cones, please
contact ABB Service Department.
Cleaning the outer cones
Remove any surplus or dirty grease or soiling from
the outer cones with a soft, clean, non-fraying cloth.
Use intensive cleaner M.X.T. 60 forte for cleaning if
necessary.
Fitting the cable connectors
•
Connect the cable connectors to the relevant
outer cones in accordance with the manufacturer’s
instructions.
Observe the tightening torques for screw
connections given in the cable connector
manufacturer’s instructions.
•
Use a diagonal cutter to break out the required
cable openings in the floor plates. Refit the floor
plates. Press the cable bushings into the openings
in the floor plates.
Fit the cable mounting rails and fasten
the high-voltage cables to the cable
mounting rails using the cable clamps.
•
Connect the earthing conductors of the cable
screens to the earthing bar in the panel.
•
If window-type current transformers are used,
route the earthing conductors of the cable
screen back through the current transformers
and connect the earthing conductor to the
earthing bar in the panel.
The earthing conductors of the cable
screens should always be routed to the
earthing bar in the shortest possible
distance.
•
Refit the covers on the panels.
2.6 Concluding installation work
•
Remove all tools and other foreign bodies from
the switchgear.
•
Refit any cladding, covers, cable ducts, etc.
removed during the installation work.
Use only chlorine-free cleansers for
cleaning of the switchgear.
•
Clean the outsides of the panels where necessary.
•
Touch up any damage to paintwork with a
suitable paint.
•
Check that the switchgear room is in proper
condition for operation and establish that
condition if necessary.
