Siemens 7SJ85 - Settings

The selection list displays the measuring points that are connected to the I 3ph RLC interface of the Capacitor
bank function group:
[scmpselection_tolp_rlc, 1, en_US]
Figure 7-5 Example of Measuring-Point Selection
The MP selection parameter is set for all stages. The setting applies equally to all stages of the function.
In the default setting, a measuring point is not selected. You must select a measuring point. If you do not
select a measuring point, an inconsistency is indicated via the read-only parameter Consistency
failure :
[scinconsistency_tolp_rlc, 1, en_US]
Figure 7-6 Function Inconsistency Indication
Parameter: Rated-current selection
•
Default setting (_:2311:101) Rated-current selection = prim. rated curr.of MP
With the parameter Rated-current selection, you define the reference value for current normalization
in thermal-replica calculation, for percentage-measured values, and for thresholds set in percentages.
Parameter Value
Description
prim. rated curr.of MP
Select this setting if you want to use the rated current of the whole capac-
itor bank as the reference value.
RLC rated current
Select this setting if you want to use the individual rated current of the RLC
object to be proteced (for example, a resistor or reactor) as the reference
value.
Parameter: RLC rated current
•
Default setting (_:2311:102) RLC rated current = 1000 A
With the parameter RLC rated current, you set the primary rated current of the respective protected
object which is usually a reactor or resistor branch within the capacitor-bank installation.
Settings
Addr.
Parameter C Setting Options Default Setting
General
_:2311:101 General:Rated-current
selection
•
prim. rated curr.of MP
•
RLC rated current
prim. rated
curr.of MP
7.3.5
Capacitor Bank Protection
7.3 Thermal Overload Protection for Capacitor Banks
SIPROTEC 5, Overcurrent Protection, Manual 975
C53000-G5040-C017-8, Edition 07.2017