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ABB


UniSafe is medium voltage metal-clad switchgear  suitable for indoor installations.

The switchgear is modular and is made up by placing standardised units side by side in a coordinated way.

The unit compartments are metallically segre- gated from each other and the live parts are air insulated.

The switchgear functional units are guaranteed to be arc-proof in compliance with IEC 60298 Standards app. AA, class A accessibility, criteria 1 to 5.

Installation requires very simple civil works. The switchgear can be wall-mounted. Access to the branch connections to connect the power cables takes place from the front of the switchgear.

 

Characteristics of UniSafe switchgear

 

  • Metal-clad air-insulated switchboard
  • Studied for medium voltage distribution
  • Factory-tested for installations inside rooms
  • Guaranteed arc-proof units
  • Compartments segregated by means of metallic partitions openly connected to earth
  • Limited use of insulating materials
  • Complete with mechanical safety interlocks
  • Structure made of pre-galvanised sheet
  • Putting into service, maintenance and service operations can be carried out from the front
  • Complete set of apparatus: gas and vacuum circuit breakers, contactors and switch disconnectors
  • Equipped with conventional instrument trans- formers or new generation sensors
  • Wide range of functional units for any all installation solutions
  • Easy-to-assemble modular structure

Electrical characteristics of the switchgear
The electrical characteristics of the switchgear can vary depending on  environmental conditions other than those described and for degrees of protection higher than the standard values.

Rated voltage

kV

12

17.5

24

Rated insulation voltage

kV

12

17.5

24

Test voltage at power frequency

kV 1min

28

38

50

Impulse withstand voltage

kV

75

95

125

Rated frequency

Hz

50-60

50-60

50-60

Rated short-time withstand current

kA 1s

…50

…50

…25

Peak current

kA

…125

…125

…63

Rated short-time withstand current

kA 3s

…40

…40

…25

Peak current

kA

…100

…100

…63

Internal arc withstand current

kA 1s
kA 0.5s

…40

…50

…40

…50

…25

-

Main busbar rated current

A

…4000

…4000

…2500

Rated current of the branch connections

A

630

1250

1600

2000

2500

3150

630

1250

1600

2000

2500

3150

630

1250

1600

2000

2500

-

Rated current of the branch connections with forced ventilation

A

3600

4000

3600

4000

2500

-

Electrical characteristics of the Earthing Switch

24 kV

17.5 (*)

kV

Rated voltage

… 25 * 3s

… 25 * 3s

… 25 * 3s

25 * 3s

31.5 * 3s

50 * 1s

kA

Short-time withstand current /

Short-circuit making capacity

63

63

kA

Peak current

79

125

* Values also valid for 15 KV.

Degress of Protection
The degrees of protection of the switchgear comply with IEC 60529 / CEI EN 60529 Standards.
UniSafe switchgear are normally supplied with the following standard degrees of protection:
  • external housing:IP4X
  • inside the units:IP2X.

On request the external housing can be supplied with other degrees of protection up to a maximum of IP42.


Colour of the external surfaces

RAL7035 /RAL 7032

 


Environmental conditions

The switchgear ratings are guaranteed under the following environmental conditions:


Minimum ambient temperature

-5 ºC Maximum ambient

temperature

+40 ºC Maximum

Relative humidity

95% Maximum altitude

1000 m s.l.m. In

Presence of unpolluted and non-corrosive atmosphere