NES-HD
The type-tested high-performance double busbar switchgear with withdrawable unit technology meets all the requirements for the highest rated values and availability.
Internal partitioning into eight metal-clad function compartments ensures maximum personnel and equipment protection.
The switchgear is equipped with internal pressure relief channels to discharge hot gases arising in the event of an internal arc. Optionally, a discharge point from the switch compartment or a relief in the switch compartment with a collective absorber can be supplied.
Design features and classification under standard IEC 62271-200
| Busbar system | Double |
| Operational availability category | LSC 2B |
| Partition class | PM |
| Internal arc resistance classification | IAC AFLR |
|
Switchgear system |
12 kV |
|
|
Rated values |
max. |
|
|
Rated voltage |
12 |
kV |
|
Rated power-frequency withstand voltage |
28 |
kV |
|
Rated lightning impulse withstand voltage |
75 |
kV |
|
Rated busbar current |
4,000 |
A |
|
Rated short-time withstand current |
50 |
kA |
|
Rated impulse current |
125 |
kA |
|
Rated short circuit period tk / tke |
3 / 1 |
s |
|
Internal arc resistance |
AFLR 50 kA / 1 s |
|
