Reactive Power Stage
Logic of a Stage
[lo_3phase reactive power, 2, en_US]
Figure 7-173
Logic Diagram of the Reactive Power Stage (Stage Type: Power Q<)
Measured Value
The Measured value parameter is used to specify which measured power value is processed by the tripping
stage. Possible settings are positive seq. power and the phase-selective powers power of phase A,
power of phase B or power of phase C.
Pickup Characteristic
With the stage type you specify if the stage work as a greater stage (stage type: Power Q>) or as a smaller
stage (stage type: Power Q<).
The Threshold parameter is used to define the pickup threshold of the stage. The Tilt power charac-
teristic parameter is used to define the tilt of the pickup characteristic. The figure below shows the defini-
tion of the signs.
7.22.4
Protection and Automation Functions
7.22 Power Protection (P,Q), 3-Phase
SIPROTEC 5, High-Voltage Bay Controller, Manual 855
C53000-G5040-C015-9, Edition 11.2017
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