No.
Information
Type of
Informa-
tion
Comments
023.2552 I> TRIP
OUT
I> TRIP
023.2553 Ip TRIP
OUT
Ip TRIP
Time Overcurrent Protection for Residual Current
The function and operation of the definite-time overcurrent protection and of the inverse-time overcurrent
protection for residual current is discussed in detail in the section “Time Overcurrent Protection - General”
above (see Section
). The following paragraphs contain the specific information for setting the
overcurrent protection for residual current
3I0 O/C
.
Setting Notes
General
i
i
NOTE
The first time overcurrent protection for residual 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 instructions under “Additional Time Overcurrent Protection Functions for Residual
Current”.
During configuration of the functional scope (Section
) the characteristic type for the
residual current stages is determined under address 122
DMT/IDMT 3I0
. Only the settings for the character-
istic selected can be performed here. The definite time stages 3
Ι
0>> and 3
Ι
0> are available in all cases.
If a second or third residual overcurrent protection is used, this must be configured accordingly in addresses
134
DMT/IDMT 3I0 2
and 136
DMT/IDMT 3I0 3
.
Each protection function must be assigned to a side of the main protected object or another 3-phase current
measuring location. This can be carried out separately from the phase overcurrent protection (Section
under margin heading “Further 3-phase Protection Functions”). Consider also the
assignment of the measured current inputs of the device against the measuring locations (current transformer
sets) of the power plant (Section
under margin heading “Assignment of 3-phase
Measuring Locations”).
i
i
NOTE
If the time overcurrent protection is assigned to a side of the main protected object, the current values are
set referred to the rated current of that side
Ι
/
Ι
NS
. In other cases, current values are set in amps.
In address 2201
3I0 O/C
, the time overcurrent protection for residual current can be set to
ON
or
OFF
. The
option
Block relay
allows to operate the protection but the trip output relay is blocked.
Address 2208A
3I0 MAN. CLOSE
determines which of the zero sequence current stages must be activated
instantaneously with a detected manual close. Settings
3I0>> instant.
and
3I0> instant.
can be set
independently from the selected type characteristics;
3I0p instant.
is only possible if one of the inverse
time stages has been configured. The stabilisation does not affect
3I0>>
. This parameter can only be set with
DIGSI at Additional Settings. For this setting, similar considerations apply as for the phase current stages.
In address 2202
InRushRest. 3I0
inrush restraint (inrush restraint with 2nd harmonic) is enabled or disa-
bled. Set
ON
if the residual current stage of the time overcurrent protection is applied at the supply side of a
transformer whose starpoint is earthed. Otherwise, retain setting
OFF
. If you set a very small pickup value,
consider that the inrush restraint function cannot operate below 10 % nominal current (lower limit of
harmonic filtering).
2.4.3
2.4.3.1
Functions
2.4 Time Overcurrent Protection for Phase and Residual Currents
SIPROTEC 4, 7UT6x, Manual
155
C53000-G1176-C230-5, Edition 09.2016
Содержание SIPROTEC 4 7UT6 Series
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