Changing The Transformation Ratios Of The Transformer On The Device - Siemens SIPROTEC 5 Manual

System Functions
3.7 General Notes for Setting the Threshold Value of Trigger Functions
[sc1amper-280113-01.tif, 1, en_US]
Figure 3-52
If you have already set the settings in the secondary view by including the new transformation ratio of the
transformer in the calculation, then you answer the question with No. In this case all the settings in the secon-
dary view remain unchanged. DIGSI 5 recalculates the settings (threshold values) of the primary view. In the
example, the primary filtering time is then 300 A (1.5 A 1000 A/5 A = 300 A).
In the example, the current-transformer ratio changes from 1000 A/1 A to 1000 A/5 A. The following table
summarizes the pickup values that DIGSI 5 will recalculate in the setting view. The new values (in bold)
depend on your answer of the query (see
Threshold value, secondary (active setting view)
Threshold value, primary (covered setting view)
3.7.3

Changing the Transformation Ratios of the Transformer on the Device

The secondary value is the default setting for the device. You may directly set only secondary values on the
device.
If you change transformer data directly on the device, it is not followed by a query, like in DIGSI (see
Figure 3-51). Instead, the device assumes that all settings remain unchanged in the secondary view.
NOTE
i
i
If the device works with IEC 61850 protocol, you change the transformer data only via DIGSI 5 and not
directly on the device. If you change the transformer data directly on the device, the IEC 61850 configura-
tion of the measurement and metered values can be faulty.
102
Automatically Recalculated Secondary Values After Changes in the Current Transformer Data
Figure 3-51).
Reply to the Question
Yes
1.5 A
300 A
C53000-G5040-C018-5, Edition 11.2017
No
0.30 A
60 A
SIPROTEC 5, Fault Recorder, Manual