Oq Protection - ABB SACE Emax E1.2 Operating Instructions For The Design Engineer

OQ Protection

t
OQ
Q27
t27
93 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
Continued from the previous page
Parameters
It is possible to modify various parameters:
Parameter
Enable
Threshold Kq
Threshold Q24
Time t24
Threshold Vmin
RQ protection has StartUp enable, see page 71.
Via Ekip Connect it is also possible to access the blocking functions, see page 72.
Path
Main page - Menu - Advanced
Function
OQ protection trips when the power supplied rises above the set threshold.
If the reactive power rises above the activation threshold, the protection trips within a fixed time set by the
user.
Parameters
Q
It is possible to modify various parameters:
Parameter
Enable
Threshold Q27
Time t27
OQ protection has StartUp enable, see page 71.
Via Ekip Connect it is also possible to access the blocking functions, see page 72.
Description
To activate/deactivate the protection.
It defines the slope of the protection function.
It defines the starting point on the Q axis of the protection curve.
It is represented both as an absolute value (kVAR) and a relative value (Sn,
referring to the rated voltage set on the trip unit).
NOTES: the threshold expressed in Sn is preceded by the sign "- " in
order to indicate that it refers to reverse power.
This is the delay time between the exceeding of the tripping threshold and the
sending of the opening command
It is the minimum voltage for activation of the protection. If a there is at least
one line-to-line voltage present below the Vmin threshold, the protection is not
active.
Description
To activate/deactivate the protection.
It defines the reactive power value above 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 (kVAR) and a relative value (Sn,
referring to the rated voltage set on the trip unit).
The delay time between the exceeding of the Q27 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).
ABB | SACE Emax 2
Ekip Touch protection trip unit | 12 - G Touch protections