ABB SACE Emax E4.2 - S2(V) Protection

ABB | SACE Emax 2
Ekip Touch protection release | 13 - G Hi-Touch protections
119 | © 2013 ABB | 1SDH001000R0002 - L7804
S2(V) Protection
I21
t
t21
I
S2(V)
Path
Main page - Menu - Advanced protections
Function
The protection S2 (V):
• Protects against short circuits, with a threshold sensitive to the value of the voltage.
• It is independent from the protection S (V): the dual protection allows you to widen the
level of protection against overload
When the activation threshold I21 is exceeded, the protection trips within a fixed time t21.
The I21 threshold, as a result of a voltage drop, decreases in steps or in linear fashion,
according to two different modes:
• Step Mode provides for variation in steps according to the Ul2 parameter.
• Linear Mode provides for dynamic variation base on the parameters Ul2 and Uh2.
I21
V
I21
Ks x I21
Uh2
Ul2
I21
V
I21
Ks x I21
Ul2
Continued on the next page