[logikdia-einschaltstabilisierung-121102-st, 1, en_GB]
Figure 2-83 Logic diagram of the inrush restraint feature (simplified)
Setting Notes
General
NOTE
The first time overcurrent protection for earth current is described in the setting instructions. The param-
eter addresses and message numbers of the second and third time overcurrent protection are described at
the end of the setting notes under “Additional 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 measuring input (Section
2.1.4.3 Assignment of Protection Functions to Measuring Locations / Sides under margin heading “Further 1-
phase Protection Functions”). Consider also the assignment of the 1-phase current input of the device against
the current transformer of the power plant (Section 2.1.4.1 Topology of the Protected Object 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 2408A IE MAN. CLOSE determines which earth current stage is to be activated 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 config-
ured. This parameter can only be altered in DIGSI at Additional Settings.
If time overcurrent protection is applied on the feeding side of a transformer, select the higher stage IE>>,
which does not pick up by the inrush current or set the manual close feature to Inactive.
At address 2402 InRushRestEarth inrush restraint (inrush restraint with 2nd harmonic) is enabled or disa-
bled. Set ON if the protection is applied at the feeding side of an earthed transformer. Otherwise, retain setting
OFF.
2.5.7
Functions
2.5 Time Overcurrent Protection for Earth Current
166 SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
To Next Page
Loading...
Need help?
General
