Stage Description; Application And Setting Notes - Siemens 6MD85 Manual

Protection and Automation Functions
7.14 Overvoltage Protection with Positive-Sequence Voltage

Stage Description

7.14.3
Logic of a Stage
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Figure 7-145
Method of Measurement
The stage uses the positive-sequence voltage. The positive-sequence voltage is calculated from the measured
phase-to-ground voltages according to the defining equation.
Blocking the Stage
In the event of blocking, the picked up stage will be reset. Blocking is possible externally or internally via the
binary input signal >Block stage.

Application and Setting Notes

7.14.4
Parameter: Threshold
•
Default setting (_:211:3) Threshold = 65 V
The Threshold is set according to the definition of the positive-sequence system.
Specify the Threshold (pickup threshold) for the specific application.
Parameter: Operate delay
•
Default (_:211:6) Operate delay = 3 s
The Operate delay must be set for the specific application.
796
Logic Diagram of a Stage: Overvoltage Protection with Positive-Sequence Voltage
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017