Parameter Value Description
RMS value
Select this method of measurement if you want the stage to take harmonics
into account (for example, at capacitor banks). Consider that aperiodic DC
components present in the secondary circuit are measured and can cause
an overfunction.
For this method of measurement, do not set the threshold value of the
stage to less than 0.1 I
rated,sec
. If currents from more than one measuring
point are added up in the current interface of a function group, the setting
value should not be set lower than 0.1 I
rated,sec
multiplied by the number of
added currents.
Parameter: Pickup mode
•
Default setting (_:13051:102) Pickup mode = 3 out of 3
Use the Pickup mode parameter to define whether the protection stage picks up if all 3 measuring elements
detect the undercurrent condition (3 out of 3) or if only 1 measuring element has to detect the undercur-
rent condition (1 out of 3).
Parameter: Threshold
•
Default setting (_:13051:3) Threshold = 0.050 A
Specify the Threshold (pickup threshold) for the specific application.
Parameter: Operate delay
•
Default setting (_:13051:6) Operate delay = 0.05 s
Operate delay must be set according to the specific application. No general application notes can be given.
Settings
Addr.
Parameter C Setting Options Default Setting
Stage 1
_:13051:1 Stage 1:Mode
•
off
•
on
•
test
off
_:13051:2 Stage 1:Operate &
flt.rec. blocked
•
no
•
yes
no
_:13051:103 Stage 1:Activation
•
always active
•
with CB closed
with CB closed
_:13051:8 Stage 1:Method of
measurement
•
fundamental comp.
•
RMS value
fundamental
comp.
_:13051:102 Stage 1:Pickup mode
•
1 out of 3
•
3 out of 3
3 out of 3
_:13051:3 Stage 1:Threshold 1 A @ 100 Irated 0.030 A to 35.000 A 0.050 A
5 A @ 100 Irated 0.15 A to 175.00 A 0.25 A
1 A @ 1.6 Irated 0.001 A to 1.600 A 0.050 A
5 A @ 1.6 Irated 0.005 A to 8.000 A 0.250 A
_:13051:6 Stage 1:Operate delay 0.00 s to 60.00 s 0.50 s
6.16.5
Protection and Automation Functions
6.16 Undercurrent Protection
SIPROTEC 5, Overcurrent Protection, Manual 631
C53000-G5040-C017-8, Edition 07.2017
To Next Page
Loading...
