ABB SACE Emax E4.2 - RV Protection; RQ Protection

ABB | SACE Emax 2
92 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A Ekip Touch protection trip unit | 12 - G Touch protections
RV Protection
U22
t
t22
V
RV
Path
Main page - Menu - Advanced
Function
RV protection protects against loss of insulation (residual voltage). The residual voltage U
0
is calculated by
the vectorial sum of the phase voltages.
NOTE: the protection is activated and available for four-pole circuit-breakers or three-pole
circuit-breakers equipped with an external Neutral. On three-pole circuit breakers, the presence
of the neutral voltage must be set using the neutral voltage present parameter.
When the residual voltage exceeds the activation threshold U22, the protection trips within a fixed time t22.
Parameters
It is possible to modify various parameters:
Parameter Description
Enable To activate/deactivate the protection.
Threshold U22
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 both as an absolute value (Volts) and a relative value (Un,
nominal value defined on the trip unit).
Time t22
This is the delay time between the exceeding of the U22 threshold (determined
by the voltage value read) and the sending of the opening command (in
reference to the curve, t22 affects the entire curve, shifting it along the y-axis).
RV protection has StartUp enable, see page 71.
Via Ekip Connect it is also possible to access the blocking functions, see page 72.
RQ Protection
Q24; Kq
t
t24
RQ
Q24; Kq
Path
Main page - Menu - Advanced
Function
RQ protection protects against reversal of reactive power, with an adjustable threshold according to the
parameter Sn (= √3 x Un x In).
When the reverse reactive power drops below the activation threshold Q24, the protection trips within a fixed
time t24.
Adjustment of the constant Kq allows you to vary the tripping threshold of the protection: with Kq = 0 the
threshold is constant, while with Kq different from 0 the threshold has a slope, as illustrated in the following
figure.
Q
P
kq=0
Q24
TRIP
Figure 23
Q
P
Q24
kq
TRIP
Figure 24
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