Application And Setting Notes; Settings - Siemens 7SJ82 Manual

corresponding indication. If the blocking drops out and the threshold value of the stage is still exceeded, the
tripping delay (time delay) is started. After that time, the stage operates.
6.17.4.2

Application and Setting Notes

Parameter: Threshold
•
Recommended setting value (_:1981:3) Threshold = 10 %
The setting of the parameter Threshold depends on the respective application. A threshold value of 10 % is
a practicable value for fault indications of electrical machines.
Parameter: Operate delay
•
Recommended setting value (_:1981:6) Operate delay = 1500 ms
The setting of the Operate delay depends on the application. Observe the time grading in the power-
system protection and do not set the time for monitoring too short. The default setting is practicable. For
motors, the time depends on the permissible time period for the set unbalanced load.
Parameter: Blk. w. inrush curr. detect.
•
Default setting (_:1981:104) Blk. w. inrush curr. detect. = no
With the parameter Blk. w. inrush curr. detect., the stage can be stabilized against tripping on
transformer-inrush currents. If transformers are parts of the protection zones, set this parameter to yes.
6.17.4.3

Settings

Addr.
General
_:2311:106
_:2311:107
_:2311:101
_:2311:104
Definite-T 1
_:1981:1
_:1981:2
_:1981:3
_:1981:4
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
Parameter C
General:Reference value
General:Current limita-
tion Imax
General:Maximum phase 1 A @ 100 Irated 0.030 A to 35.000 A
current
5 A @ 100 Irated 0.15 A to 175.00 A
1 A @ 50 Irated
5 A @ 50 Irated
1 A @ 1.6 Irated
5 A @ 1.6 Irated
General:Release current 1 A @ 100 Irated 0.030 A to 10.000 A
5 A @ 100 Irated 0.15 A to 50.00 A
1 A @ 50 Irated
5 A @ 50 Irated
1 A @ 1.6 Irated
5 A @ 1.6 Irated
Definite-T 1:Mode
Definite-T 1:Operate &
flt.rec. blocked
Definite-T 1:Threshold
Definite-T 1:Dropout
ratio
Protection and Automation Functions
6.17 Negative-Sequence Protection
Setting Options
•
pos. seq. current
•
rated current
•
no
•
yes
0.030 A to 35.000 A
0.15 A to 175.00 A
0.001 A to 1.600 A
0.005 A to 8.000 A
0.030 A to 10.000 A
0.15 A to 50.00 A
0.001 A to 1.600 A
0.005 A to 8.000 A
•
off
•
on
•
test
•
no
•
yes
5.0 % to 999.9 %
0.40 to 0.99
Default Setting
rated current
no
10.000 A
50.00 A
10.000 A
50.00 A
10.000 A
50.000 A
0.050 A
0.25 A
0.050 A
0.25 A
0.050 A
0.250 A
off
no
10.0 %
0.95
637