Reactive Power Stage - Siemens 6MD85 Manual

Siprotec 5 high-voltage bay controller

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Reactive Power Stage

Logic of a Stage

[lo_3phase reactive power, 2, en_US]

Figure 7-173

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.

SIPROTEC 5, High-Voltage Bay Controller, Manual

C53000-G5040-C015-9, Edition 11.2017

Logic Diagram of the Reactive Power Stage (Stage Type: Power Q<)

Protection and Automation Functions

7.22 Power Protection (P,Q), 3-Phase