Switchgear MV AIS – ATR
ATR is an air-insulated (AIS), metal enclosed medium-voltage (MV) switchgear, mainly used for secondary distribution power systems. It is also used in special configurations for primary distribution power systems. It is designed and standardized for indoor installations, in line with the IEC norm. It can be equipped either with gas-insulated load-break switches or with an air-insulated disconnector for compartments equipped with a switch, according to the different configurations.
Technical features
Front or back access
Installation of multi-brand breakers, vacuum or gas-insulated
Installation on base frame or on concrete basement
Operators’ safety during operations and maintenance, according to Leg. Decree no. 81/2008 and legislation IEC 62271-200
Removable breakers and voltage transformers
Customized and settable digital counters and protection and control relays
Standard or digital synoptics
SCADA system integration
Integration of the thermal control system on bars and breakers, upon request
Integration of internal-arc protection systems, upon request
Integration of fast transfer systems, frequency and load-shedding control, upon request
Advantages
Tailor-made product
Interchangeable breakers
Remote control
Easy ordinary and extraordinary maintenance, thanks to front accessibility
High safety level for the operators involved
Short construction and delivery times
Applications
Oil & gas
Smart grid
Utility on primary distribution grids
Mobile substations
Photovoltaic plants
Wind power plants
Hydroelectric power stations
Other electric energy generation plants
Data Sheet ATR
Rated voltage
kV
12
17,5
24
36
Rated voltage at industrial frequency
kV (1min)
28
38
50
70
Impulse Test Voltage (BIL)
kV
75
95
125
170
Main bars rated current
A
400
630
1250
2000
2500
400
630
1250
2000
2500
400
630
1250
2000
2500
400
630
1250
2000
2500
Busbar
A
630
1250
630
1250
630
1250
630
1250
Short time rated current
kA (1s)
12,5
16
25
12,5
16
25
12,5
16
25
12,5
16
25
Rated frequency
Hz
50-60
50-60
50-60
50-60
IP Protection degree
IP4X*
IP4X*
IP4X*
IP4X*
Partition Class (switchghear classification)
PM
partition
metallic
PM
partition
metallic
PM
partition
metallic
PM
partition
metallic
Loss of service continuity classes (LSC)
LSC2A
LSC2A
LSC2A
LSC2A
Loss of service continuity classes without switch device
LSC1
LSC1
LSC1
LSC1
Arc-proof version IAC AFL
kA (1s)
20*
20*
20*
20
*Up to IP54, upon request
* Arc-proof values are based on ATR 36kV
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