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
11
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2. Installation of the switchgear at site
2.1 Fundamental notes on installation work
2.1.1 Safety notes
In order to prevent accidents (especially
hand injuries!), extreme care is to be
exercised during all work on the operating
mechanism with the mechanism bay covers
removed.
In order to ensure correct function, the
spiral spring in the energy store of the
circuit breaker operating mechanism is
permanently subjected to a basic pre-
tension which is independent of the
charging and discharging processes during
switching. This spring energy can be
suddenly released if work is performed
incorrectly in the area of the stored energy
spring!
2.1.2 General site requirements
At the start of installation, the switchgear room at
site must be complete and fitted with lighting and
power for the installation work. It must also be
lockable, dry, and with good ventilation facilities.
All necessary provisions such as openings, ducts,
etc. for laying of the power cables must already
be in place. Compliance with the conditions for
indoor switchgear to IEC 62271-1 | GB/T 11022
must be ensured.
2.1.3 Tightening torques
Use DIN screws of tensile class 8.8. Use the
tightening torques stated in table 2.1.3.1. The
tightening torques apply to unlubricated screw
connections.
Please consult the manufacturer’s
installation instructions for the tightening
torques of cable connectors and surge
arresters.
2.1.4 Handling of insulating gases
Based on the parameter, the insulating gas is
either DryAir, AirPlus or SF
6
(Reference to table
11.1 )
In normal case, no gas work is required during
installation. Please contact ABB if gas work is
required in case of repairs.
See manual 1YHA000334 for details on
handling AirPlus.
See manual 1YHA000300 for details on
handling AirPlus.
See manual 1YHA000333 for details on
handling SF
6
.
1)
1) SF
6
is a fluorinated greenhouse gas with a GWP of 22800.
The maximum quantity per panel is 5 kg.
That corresponds to a CO2 equivalent of 205 t.
Each gas compartment has a gas leakage monitor, and
therefore regular leakage testing (to Fluorinated Gas
Regulation 517/2014) is not required.
2.2 Foundation frames
•
When a raised false floor is used, load-bearing
sections of the floor frame serve as supports
for the panels. No additional foundation frame
is necessary.
The slabs of the raised false floor must
be fastened to the supporting frame.
•
If there is a concrete floor a foundation frame is
required. Standard foundation frames supplied
by ABB must be embedded in the floor topping.
•
In addition to a standard foundation frame for
conventional applications, a reinforced
foundation frame for earthquake applications is
also available. Both frames are made of
aluminum profiles. In conventional applications,
the panels are fixed in the upper slot of the
aluminum profiles by means of slot rods. In the
reinforced version, the panels are fastened with
slot rods in the lower slot of the profiles.
•
For 450 mm, 500mm and 600mm wide panels,
a further version with a corresponding width is
available (see Fig.2.1.1).
Maintain the following evenness and
—
Table 2.1.3.1: Tightening torques
Nut on stud bolt
Steel screw in pulling nut
Other screws of tensile class 8.8
M 8
12.5
18 - 24
26
M 10
50
straightness tolerances when installing
the foundation frame or a raised false floor
•
Evenness tolerance: ± 1 mm/m.
•
Straightness tolerance: max. 1 mm/m, but max.
2 mm for the entire length.
Consult the order documents for the
position of the foundation bars in the
switchgear room.
If no standard ABB foundation frames are used,
observe the relevant construction and laying
drawings for the special frames.
