ABB | SACE Emax 2
Ekip Touch protection trip unit | 10 - Measuring Pro protections
77 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
VU Protection
U14
t
t14
V
VU
Path
Main page - Menu - Advanced
Function
VU protection protects against an unbalance between the phase-to-phase voltages protected by the circuit-
breaker.
The unbalance, expressed as a percentage, is calculated as follows:
% Sbil = 100 * dmax Umi / Umi
, where
dmax Umi is the maximum deviation of the three of calculated by comparing each line-to-line voltage with the
average value, and Umi is the average value of the line-to-line voltages.
When the activation threshold is exceeded, the protection trips within a fixed time, set by the user.
NOTE:
the protection is not active if the highest of the voltages measured is in any case less
than 30% of the Un.
Parameters
Here is a list of the available parameters:
Parameter
Description
Enable
To activate/deactivate the protection.
Threshold U14
It defines the voltage value that activates the protection when exceeded (with
reference to the figure above, the threshold is the part of the curve parallel to
the y-axis).
It is represented as a percentage value of Un.
Time t14
The delay time between the exceeding of the U14 threshold and the sending of
the opening command (with reference to the figure above, the threshold is the
part of the curve parallel to the x-axis).
VU protection has
StartUp enable
, see page 71.
Via Ekip Connect it is also possible to access the
blocking functions
, see page 72.
UF Protection
f12
t
t12
f
UF
Path
Main page - Menu - Advanced
Function
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.
NOTE:
the protection is not active for voltages <30V.
Parameters
Here is a list of the available parameters:
Parameter
Description
Enable
To activate/deactivate the protection.
Threshold f12
It defines the frequency value below which the protection is activated (with
reference to the figure above, the threshold is the part of the curve parallel to
the y-axis).
It is represented both as an absolute value (Hertz) and a relative value (fn,
nominal value defined on the trip unit).
Time t12
The delay time between the exceeding of the f12 threshold and the sending of
the opening command (with reference to the figure above, the threshold is the
part of the curve parallel to the x-axis).
UF protection has
StartUp enable
Via Ekip Connect it is also possible to access the
blocking functions
, see page 72.
Summary of Contents for SACE Emax E1.2
Page 2: ...ABB SACE Emax 2 2 2017 ABB 1SDH001330R0002 ECN000058721 Rev A ...
Page 8: ...VI 2017 ABB SACE Emax 2 1SDH001330R0002 ECN000058721 Rev A ...
Page 9: ...ABB SACE Emax 2 3 2017 ABB 1SDH001330R0002 ECN000058721 Rev A ...
Page 310: ...ABB SACE Emax 2 304 2017 ABB 1SDH001330R0002 ECN000058721 Rev A Service 1 Power Care ...