Siemens 6MD85, Manual

Page: 155 / 1256

The following setting example shows how you can change the transformer ratio in DIGSI 5, and what impact
this has on the settings in the setting views Primary and Secondary. The protection setting is observed in the
example of the Overcurrent protection function.
The following output data are assumed:
Current transformer: 1000 A/1 A
Protection pickup value: 1.5 A
The following figure shows the protection setting of the Overcurrent protection function in the secondary
view. The threshold value of the stage is set to 1.5 A.
[scmodsek_1, 1, en_US]
Figure 3-92 Protection Setting, Display of the Active Setting Sheet
When you click the green arrow in the setting sheet at the upper left, you get to the window for switching
over to the setting view (see the following figure). Select the setting view you prefer.
[scmodums_2, 1, en_US]
Figure 3-93 Switchover to the Desired Setting View
The following figures show the setting sequence in the Primary edit mode. Set the transformer data. In the
example, the current transformer has a transformation ratio of 1000 A/1 A.
System Functions
3.9 General Notes for Setting the Threshold Value of Protection Functions
SIPROTEC 5, High-Voltage Bay Controller, Manual 155
C53000-G5040-C015-9, Edition 11.2017