2 Functions
184
7UT613/63x Manual
C53000-G1176-C160-2
Figure 2-81 Logic diagram of the inrush restraint feature (simplified)
2.5.7 Setting Notes
General
Note
The first time overcurrent protection for earth current is described in the setting instruc-
tions. The parameter addresses and message numbers of the second and third time
overcurrent protection are described at the end of the setting instructions under „Ad-
ditional Time Overcurrent Protection Functions for Earth Current“.
During configuration of the functional scope, the characteristic type has been set in
address 124. Only the settings for the characteristic selected can be performed here.
The definite time stages IE>> and IE> are always available.
If a second overcurrent protection is used, it also needs to be set at address 138
DMT/IDMT Earth2 and must be configured accordingly.
The overcurrent protection for earth current is assigned to a 1-phase current measur-
ing input (section 2.1.4 under margin heading „Additional 1-phase Protection Func-
tions“). Consider also the assignment of the 1-phase current input of the device
against the current transformer of the power plant (section 2.1.4 under margin heading
„Assignment of Auxiliary 1-phase Measuring Locations“).
At address 2401 EARTH O/C, time overcurrent protection for earth current can be set
to ON or OFF. The option (Block relay) allows to operate the protection function but
the trip output relay is blocked.
Address 2408 IE MAN. CLOSE determines which earth current stage is to be acti-
vated instantaneously with a detected manual close. Settings IE>> instant. and
IE> instant. can be set independently from the selected type characteristics;IEp
instant. is only available if one of the inverse time stages is configured. This pa-
rameter can only be altered in DIGSI at Additional Settings.
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