With this parameter you set the Measured value .
Parameter Value Description
compensated
The stage uses compensated unbalanced values. This means an operational
current unbalance will be eliminated. This allows you to increase signifi-
cantly the sensitivity of the measurement.
Note: If any phase current I
c
is lower than the threshold Current
threshold CB open, the stage is rendered inactive by setting
I
unbal.,comp.
to 0 A. This condition is held for 250 ms after energizing has been detected
in order to avoid a pickup as a consequence of the charging process.
Siemens recommends using compensated unbalanced values. In case that
automatic compensation is applied, consider the setting notes for the
operate delay.
non-compensated
The stage works with non-compensated unbalanced values. This means the
measurand may contain an existing operational current unbalance.
Parameter: Threshold
•
Default setting (_:16231:3) Threshold = 1.500 A
Set the parameter Threshold for the specific application.
When using compensated unbalanced values, very sensitive settings are possible. When using non-compen-
sated unbalanced values, the threshold must be higher than the maximum operational unbalanced current.
Parameter: Operate delay
•
Default setting (_:16231:6) Operate delay = 0.30 s (for the 1st stage)
Set the parameter Operate delay for the specific application.
NOTE
If the function has been set to automatic compensation and the stage works with compensated values, the
maximum permitted operate delay is 80 ms. If the operate delay is set to longer than 80 ms the automatic
compensation might cause dropout of the picked-up stage. This risk does not exist when manual compen-
sation or non-compensated values are used.
Settings
Addr.
Parameter C Setting Options Default Setting
I> 1
_:16231:1 I> 1:Mode
•
off
•
on
•
test
off
_:16231:2 I> 1:Operate & flt.rec.
blocked
•
no
•
yes
no
_:16231:100 I> 1:Measured value
•
compensated
•
non-compensated
compensated
_:16231:3 I> 1:Threshold 1 A @ 100 Irated 0.030 A to 35.000 A 0.200 A
5 A @ 100 Irated 0.15 A to 175.00 A 1.00 A
1 A @ 50 Irated 0.030 A to 35.000 A 0.200 A
5 A @ 50 Irated 0.15 A to 175.00 A 1.00 A
1 A @ 1.6 Irated 0.001 A to 1.600 A 0.200 A
5 A @ 1.6 Irated 0.005 A to 8.000 A 1.000 A
_:16231:6 I> 1:Operate delay 0.00 s to 60.00 s 0.08 s
7.5.4.3
Capacitor Bank Protection
7.5 Current-Unbalance Protection for Capacitors, 1-Phase
1014 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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