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Protection and Automation Functions
6.37 Power Protection (P,Q), 3-Phase
Reactive Power Stage
6.37.4
Logic of a Stage
[lo_3phase reactive power, 2, en_US]
Figure 6-232
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.
802
Logic Diagram of the Reactive Power Stage (Stage Type: Power Q<)
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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