Where no time grading and therefore no displacement of the characteristic curve is required, leave the Time
dial parameter at 1 (default setting).
Parameter: Reset
•
Default setting (_:4891:131) Reset = disk emulation
You can use the Reset parameter setting to define whether the stage decreases according to the dropout
characteristic curve (in accordance with the behavior of a disk emulation = rotor disk) or instantaneously.
Parameter Value Description
disk emulation
Select this setting if the device is coordinated with electromechanical
devices or other devices which perform a dropout after a disk emula-
tion.
instantaneous
Select this setting if the dropout does not have to be performed after a
disk emulation and an instantaneous dropout is desired instead.
Settings
Addr. Parameter C Setting Options Default Setting
General
_:4891:1 Inverse-T 1:Mode
•
off
•
on
•
test
off
_:4891:2 Inverse-T 1:Operate &
flt.rec. blocked
•
no
•
yes
no
_:4891:111 Inverse-T 1:Directional
mode
•
forward
•
reverse
forward
_:4891:8 Inverse-T 1:Method of
measurement
•
fundamental comp.
•
RMS value
fundamental
comp.
_:4891:110 Inverse-T 1:Directional
comparison
•
no
•
yes
no
_:4891:112 Inverse-T 1:Release via
input signal
•
no
•
yes
no
_:4891:10 Inverse-T 1:Blk. by
meas.-volt. failure
•
no
•
yes
yes
_:4891:26 Inverse-T 1:Dynamic
settings
•
no
•
yes
no
_:4891:27 Inverse-T 1:Blk. w. inrush
curr. detect.
•
no
•
yes
no
_:4891:3 Inverse-T 1:Threshold 1 A @ 100 Irated 0.030 A to 35.000 A 1.200 A
5 A @ 100 Irated 0.15 A to 175.00 A 6.00 A
1 A @ 50 Irated 0.030 A to 35.000 A 1.200 A
5 A @ 50 Irated 0.15 A to 175.00 A 6.00 A
1 A @ 1.6 Irated 0.001 A to 1.600 A 1.200 A
5 A @ 1.6 Irated 0.005 A to 8.000 A 6.000 A
_:4891:130 Inverse-T 1:Type of char-
acter. curve
_:4891:114 Inverse-T 1:Min. time of
the curve
0.00 s to 1.00 s 0.00 s
_:4891:131 Inverse-T 1:Reset
•
instantaneous
•
disk emulation
disk emulation
_:4891:101 Inverse-T 1:Time dial 0.00 to 15.00 1.00
_:4891:115 Inverse-T 1:Additional
time delay
0.00 s to 60.00 s 0.00 s
7.7.6.3
Protection and Automation Functions
7.7 Directional Overcurrent Protection, Ground
726 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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