Rq2 Protection - ABB SACE Emax E1.2 Operating Instructions For The Design Engineer

RQ2 Protection

RQ2
Q24; Q25; Kq; Kq2
t24
Q24; Q25; Kq; Kq2
99 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
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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
Q24
Q25
TRIP
Figure 27
Parameters
It is possible to modify various parameters:
Parameter
Enable
Threshold Kq
Threshold Kq2
Threshold Q24
Threshold Q25
Time t24
Threshold Vmin
RQ2 protection has StartUp enable, see page 71.
Via Ekip Connect it is also possible to access the blocking functions, see page 72.
P
kq=0
Q24
kq2=0
Q25
Figure 28
Description
To activate/deactivate the protection.
It defines the slope of the protection function.
It defines the slope of the protection function.
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.
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.
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.
Q
kq2 kq
TRIP
Ekip Touch protection trip unit | 13 - G Hi-Touch protections
ABB | SACE Emax 2
P