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