Setting Notes - Siemens SIPROTEC 4 Manual

Functions
2.9 Undervoltage-controlled reactive power protection (27/Q)
[lo-recl-rel-qvp-20120319, 2, en_US]
Figure 2-53
2.9.2

Setting Notes

General
Configuration of the protection functions at address 155 27/Q-Protection defines whether the QU protec-
tion is Enabled or Disabled.
At address 5501 27/Q-Protection the QU protection function can be switched ON or OFF.
The release current is entered at address 5502 I-Release. The default setting is at 10 % of the rated current.
The threshold is one of the pickup criteria for tripping.
At address 5503 Inrush blk you can activate the blocking when inrush has been detected.
144
Logic diagram of QU protection restarting
SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017