NES / NES-H Duplex
The type-tested medium-voltage switchgear with withdrawable unit technology is also available as a duplex version. High availability and security of supply distinguish this system design. Switch cubicles can be arranged back-to-back or facing each other.
Pressure relief channels, single or collective absorbers and deflector plates are used to discharge hot gases arising in the event of an internal arc.
Design features and classification under standard IEC 62271-200
| Busbar system | Duplex |
| Operational availability category | LSC 2B |
| Partition class | PM or PI |
| Internal arc resistance classification | IAC AFLR |
|
Switchgear system |
12 kV Type NES Duplex |
17.5 kV Type NES-H Duplex |
24 kV Type NES-H Duplex |
|
|
Rated values |
max. |
max. |
max. |
|
|
Rated voltage |
12 |
17.5 |
24 |
kV |
|
Rated power-frequency withstand voltage |
28 |
38 |
50 |
kV |
|
Rated lightning impulse withstand voltage |
75 |
95 |
125 |
kV |
|
Rated busbar current |
2,500 |
4,000 |
2,500 |
A |
|
Rated short-time withstand current |
40 |
50 |
31.5 |
kA |
|
Rated impulse current |
100 |
125 |
80 |
kA |
|
Rated short circuit period |
3 |
3 |
3 |
s |
|
Internal arc resistance |
AFLR 40 kA / 1s |
AFLR 50 kA / 1 s |
AFLR 31.5 kA / 1 s |
