Siemens SIPROTEC 7ST6, Руководство пользователя, Страница: 206 / 356

2 Functions
206
7ST6 Manual
E50417-G1176-C251-A3
2.21.2 Setting Notes
General In DIGSI
®
double-click on Settings to display the relevant selection. A dialog box with
the tabs General, Transformer data, System data, Voltage transformers and Circuit
breaker will open under
Power System Data 1
, in which you can configure the in-
dividual parameters. Thus, the following subsections are structured accordingly.
Transformer Data
for Auto-transform-
er Systems At address
206 IF CT STARPOINT
the polarity of the current transformers (negative
feeder current) must be stated. This setting determines the measuring direction of the
device (forwards = line direction).
The measured value connections can be found in the Appendix under A.3.
At address
207 IF CT PRIMARY
you set the primary rated CT current (negative
feeder current).
At addresses
209 UF PRIMARY
and
210 UF SECONDARY
, information regarding the
primary and secondary current ratings of the current transformers (negative feeder
voltage) is entered.
In auto-transformer systems, the protection functions can evaluate either
• The summation current of the overhead contact line current and the negative feeder
current, or
• The overhead contact line current
In the parameter
CURRENT I1, I2
(address
213
) you specify which current will be
fed to the protection functions for evaluation. If you want the summation current to be
processed by the protection functions, set address
213
to
Sum I1, I2
. The vectors
of the overhead contact line current and the negative feeder current are added.
Note
If at address
213
the parameter
CURRENT I1, I2
is set to
Sum I1, I2
, the setting
of jumper X600 on the C-I/O 13 board must be changed for the summation! The
default setting of this jumper on delivery is „without summation“!
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