Ventilation Of The Panels - ABB UniGear ZS1 Instruction Manual

18
18.1
18.2
20.2
14
14.1
14.2
A Busbar compartment
B Circuit-breaker compartment
C Cable compartment
D Low voltage compartment
1 Enclosure
1.1 Pressure relief flap
1.2 Control wiring duct
1.7 Pressure relief flap made of expanded
metal
2 Branch conductor
3 Busbar
Figure 2: Example of UniGear ZS1
8
The finishing coat is in the standard RAL 7035 colour (special colours by agreement). Stoving
completes the procedure and provides considerable insensitivity to impact and corrosion.
The circuit-breaker compartment and cable connection compartment doors are pressure resistant and
can either be fitted with screws or manual closing systems (central handle).

3.2.1 Ventilation of the panels

Openings in the outer enclosure are needed for the purpose of ventilation in the case of certain rated
currents in the busbars and branch bars.
For incoming air to the circuit-breaker compartment, the horizontal partition is provided with air-vents
20.2. IP4X degree of protection and safety in the case of any release of hot gas due to an arc fault are
provided by flap 20.3 in the horizontal partition 20.
For outgoing air, the pressure relief flaps 1.1 are made of expanded metal instead of flat steel sheets.
The shape and size of the vents in expanded metal provide the IP4X degree of protection.
In cases of higher ambient temperature (>40 °C) and/or increased frequency (60 Hz) it may be necessary
to install a fan in the horizontal partition. This is not standard. Please refer to figures 109, 110.
It is necessary to use forced fan ventilation in 3600 A and 4000 A panels for 12/17.5 kV rated voltage
and in 2500 A panels for 24 kV rated voltage.
5 Isolating bushing
6 Earthing switch
7 Current transformer
8 Voltage transformer
9 Partition – removable
10 Control wiring plug connector
12 Mounting plate
12.1 Top shutter
12.2 Lower shutter
13 Withdrawable part
14 Earthing switch operating mechanism
14.1 Operating shaft for earthing switch
1.1
A
1
2
3
84
12
5
6
7
8
17
B
C
14.2 Slide
15.1 Terminal rack
16 Cable sealing end
17 Floor cover – split
18 Spindle mechanism
18.1 Spigot on spindle
18.2 Hole in spindle for insertion lever
19 Main earthing bar
20 Horizontal partition, removable
20.2 Ventilation grid
21 Cable clamp
84 Partition
1.7
9
D
12.1
15.1
10
1.2
12.2
13
18
20.2
20
14
1.2
16
21
19