Application And Setting Notes - Siemens 6MD85 Manual

Protection and Automation Functions
7.10 Inrush-Current Detection
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Figure 7-132

Application and Setting Notes

7.10.4
Parameter: Operat.-range limit Imax
•
Recommended setting value (_:106) Operat.-range limit Imax = 7.5 A
With the parameter Operat.-range limit Imax, you can specify at which current the inrush-current
detection is blocked internally. Set the value to be greater than the RMS value of the maximum inrush
current of the transformer. A practicable value is 7.5 times the transformer rated current.
Parameter: Blocking with CWA
•
Recommended setting value = (_:111) Blocking with CWA = yes
Parameter Value
yes
no
Parameter: Blocking with 2. harmonic
•
Recommended setting value (_:110) Blocking with 2. harmonic = yes
764
Logic Diagram of the Inrush-Current Detection
Description
CWA process activated.
CWA process deactivated.
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017