ABB SACE Emax E1.2, Operating Instructions For The Design Engineer

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ABB | SACE Emax 2
Ekip Touch protection trip unit | 13 - G Hi-Touch protections 99 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
RQ2 Protection
Q24; Q25; Kq; Kq2
t
t24
RQ2
Q24; Q25; Kq; Kq2
Path
Main page - Menu - Advanced
Function
RQ2 protection:
• It protects against the reversal of reactive power, with an adjustable threshold according to the active
power value.
• It is a variant of the RQ protection available with Ekip G Hi-Touch trip units.
When the reverse reactive power drops below activation threshold, the protection trips within a fixed time t24.
The parameters Q24 and Q25, with the respective constants Kq and Kq2, allow you to characterize the
response curve with a dynamic behavior.
In particular, the adjustment of the constants Kq and Kq2 allows you to vary the tripping threshold of the
protection: with Kq and Kq2 = 0 the threshold is constant, while with Kq and Kq2 different to 0 the threshold
has a slope, as illustrated in the following image.
NOTE: The trip unit accepts parameters in accordance with the following limitations: Q24 <
Q25 e Kq < Kq2 (slope).
Q
P
kq2=0 Q25
TRIP
Q24 kq=0
Figure 27
Q
P
TRIP
Q24
kq kq2
Q25
Figure 28
Parameters
It is possible to modify various parameters:
Parameter Description
Enable To activate/deactivate the protection.
Threshold Kq It defines the slope of the protection function.
Threshold Kq2 It defines the slope of the protection function.
Threshold Q24
It defines the reactive power value for which the protection is activated.
It is represented both as an absolute value (kVAR) and a relative value (Sn,
referring to the rated voltage set on the trip unit).
NOTE: the threshold expressed in Sn is preceded by the sign “- “ in
order to indicate that it refers to reverse power.
Threshold Q25
It defines the reactive power value for which the protection is activated.
It is represented both as an absolute value (kVAR) and a relative value (Sn,
referring to the rated voltage set on the trip unit).
NOTE:
the threshold expressed in Sn is preceded by the sign “- “ in
order to indicate that it refers to reverse power.
Time t24
This is the delay time between the exceeding of the tripping threshold and the
sending of the opening command
Threshold Vmin
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.
RQ2 protection has StartUp enable , see page 71.
Via Ekip Connect it is also possible to access the blocking functions , see page 72.