Protection Vu; Protection Uf - ABB SACE Emax 2 Series Installation, Operation And Maintenance Instructions

Protection VU

t
VU
U14
t14

Protection UF

t
UF
f12
t12
98 | © 2013 ABB | 1SDH001000R0002 - L7804
Path
Main page - Menu - Advanced protections
Function
The protection VU protects against an imbalance between the voltages of the individual phases
protected by the circuit-breaker.
When the activation threshold is exceeded, the protection trips within a fixed time, set by the
user.
Parameters
V The following is a description of the parameters:
Parameter
Enabling
Threshold (U14)
Time (t14)
Protection VU has Trip Enable, see page 93.
Path
Main page - Menu - Advanced protections
Function
The UF protection trips when line frequency drops below the set threshold.
If the line frequency drops below the activation threshold, the protection trips within a fixed
time set by the user.
Parameters
The following is a description of the parameters:
f
Parameter
Enabling
Threshold (f12)
Time (t12)
Protection UF has Trip Enable, see page 93.
Description
Activates/deactivates the protection.
It defines the current value that if exceeded activates the protection
(in reference to the curve, it is the part parallel to the ordinate).
It is represented as a percentage value of 1 In
The delay time between the exceeding of the U14 threshold and
the sending of the opening command (in reference to the curve, it
is the part parallel to the abscissa).
Description
Activates/deactivates the protection.
Defines the frequency value below which the protection is activated
(in reference to the curve, it is the part parallel to the ordinate).
It is represented both as an absolute value (Hertz) and a relative
value (Fn, nominal value defined on the release).
The delay time between the exceeding of the f12 threshold and the
sending of the opening command (in reference to the curve, it is
the part parallel to the abscissa).
Ekip Touch protection release | 10 - Measuring Pro protections
ABB | SACE Emax 2