Power System Data Of The Bay Unit - Siemens SIPROTEC 7SS523 V3.2 Manual

5.15

Power System Data of the Bay Unit

5.15.1 Functional Description
5.15.2 Setting Notes
CT STARPNT
In PRIMARY
With the bay unit running in stand-alone mode, the user can set the current transform-
er starpoint and the minimum time which must elapse before the TRIP command is
reset.
The parameter CT STARPNT
starpoint. The reference point is the current transformer itself.
Note
The parameter CT STARPNT (1101/BU) can only be set with the bay unit running in
stand-alone mode. As long as there is a connection with the central unit, the
parameters (1101/BU, 1105/BU, 1141/BU) are managed and set by the CU and
are therefore hidden in DIGSI and in the LCD.
The parameter settings in the central unit are not affected by this.
With the bay unit linked to the central unit, the setting of this parameter is transmitted
from the central unit to the bay units. The local setting in the bay units is overwritten.
With setting TOWARDS LINE, the CT starpoint is oriented towards the line.
With setting TOWARDS BUSBAR, the CT starpoint is oriented towards the busbar.
With the parameter In PRIMARY
ed CT current .
Note
The parameter In PRIMARY
stand-alone mode.
The parameter settings in the central unit are not affected by this.
With the bay unit linked to the central unit, the setting of this parameter is transmitted
from the central unit to the bay units. The local setting in the bay units is overwritten.
Power System Data of the Bay Unit
1101/BU
is used to select the orientation of the CT
( )
1105/BU
you inform the device of the primary rat-
( )
1105/BU
can only be set with the bay unit running in
( )
7SS52 V4 Manual
C53000-G1176-C182-1
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