Functions
192
7SS52 V4 Manual
C53000-G1176-C182-3
The parameter Ip (1214/BU) is used to set the threshold for the phase currents in the
overcurrent stage of the inverse-time O/C protection.
This parameter is only displayed if the parameter CHARAC. PH
(7812/BU) is set to IN-
VERSE TIME.
TIp The parameter TIp (1215/BU) is used to set the trip time delay (time multiplier) for
the overcurrent stage of the inverse-time O/C protection.
This parameter is only displayed if the parameter CHARAC. PH
(7812/BU) is set to IN-
VERSE TIME.
RMS FORMAT The parameter RMS FORMAT (1216/BU) is used to select the format in which the cur-
rents will be evaluated for the current calculation of the overcurrent stage.
This parameter is only displayed if the parameter CHARAC. PH
(7812/BU) is set to IN-
VERSE TIME.
With setting FUNDAMENTAL the fundamental wave of the currents will be evaluated.
With setting TRUE RMS the r.m.s. value of the currents will be evaluated.
MAN.CLOSE The parameter MAN.CLOSE (1221/BU) is used to set whether the trip time delay for
the overcurrent or high-set current stage for the phase currents will be overridden if
the circuit breaker is manually closed.
With setting I>> UNDELAYED the delay time set with the parameter TI>> (1203/BU)
will be disregarded.
With setting I> /Ip UNDELAYED. the delay time set with the parameter TI> (1213/
BU) will be disregarded.
With setting INEFFECTIVE the delay times set with the parameters TI>> (1203/BU)
or TI> (1213/BU) respectively are not disregarded.
O/C EARTH The parameter O/C EARTH (1501/BU) is used to activate and deactivate the O/C pro-
tection for the earth current.
With setting ON, the O/C protection for the earth current is active.
With setting OFF, the O/C protection for the earth current is deactivated.
IE>> In a first step, the high-set stage IE>> is set (1502/BU to 1506/BU). For the settings,
similar factors as for the stages I>> and I> have to be considered. If the IE>> stage is
not needed, the time TIE>> (1503/BU) is set to infinite.
The parameter IE>> (1502/BU) is used to set the threshold for the earth current in
the high-set stage (definite-time).
TIE>> The parameter TIE>> (1503/BU) is used to set the trip time delay for tripping of the
high-set current stage (definite-time). The delay time is started when the threshold for
the earth current is exceeded. This threshold is set with the parameter
IE>> (15
02/
BU).
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