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2.1.3
Power System Data 1
The device requires certain basic data regarding the protected equipment, so that the
device will be compatible with its desired application. This comprises e.g. nominal
system data, nominal data of transformers, polarity ratios and their physical connec-
tions, in certain cases circuit breaker properties, and similar. Furthermore, there are
a number of settings associated with all functions rather than a specific protection,
control or monitoring function. These data can normally only be changed from a PC
running DIGSI
2.1.3.1
Setting Notes
General
In DIGSI
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.
At address 245 BI CONTROL you specify the control of the binary inputs for the
zone/catenary changeover (Edge/Level).
In address 201 CT Starpoint the polarity of the current transformers must be
Transformer Data
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 202 CT PRIMARY you set the primary rated CT current (overhead contact
line current). The secondary rated current is set in address 203 CT SECONDARY.
At addresses 204 Unom PRIMARY and 205 Unom SECONDARY, information is entered
regarding the primary and secondary current ratings of the current transformers.
It is important to ensure that the rated secondary current of the current transformer
matches the rated current of the device, otherwise the device will incorrectly calculate
primary data.
Correct entry of the primary data is a prerequisite for the correct computation of oper-
ational measured values with primary magnitude. If the settings of the device are per-
formed with primary values using DIGSI
quirement for the fault-free operation of the device.
At address 206 IF CT STARPOINT the polarity of the current transformers (negative
Transformer Data
for Auto-transform-
feeder current) must be stated. This setting determines the measuring direction of the
er Systems
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.
Please heed the detailed description given in chapter 2.21!
7ST6 Manual
E50417-G1176-C251-A3
®
and are discussed in this subsection.
®
double-click on Settings to display the relevant selection. A dialog box with
®
, these primary data are an indispensable re-
2.1 General
33
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