The default setting is a reasonable compromise between measuring accuracy and pickup time. For a non-
sensitive setting (high threshold value), you can set the parameter Measuring window to a smaller value.
Stage Description
Description
Logic of the Stage
[lodfdtst-160113-01.tif, 1, en_US]
Figure 7-168
Logic Diagram of Rate of Frequency Change Protection
(1) For the stage type df/dt rising, the value df/dt rising is used.
Frequency Rising/Falling
The stage df/dt falling is used to detect frequency falling and the stage df/dt rising is used to detect
frequency rising.
You set the threshold value as an absolute value. You define the frequency-change direction via the selected
stage type.
Blocking of the Stage
The following blockings reset the picked up stage completely:
•
Via the binary input signal
>Block stage
•
Via the undervoltage blocking when the voltage drops below the Minimum voltage
7.21.4
7.21.4.1
Protection and Automation Functions
7.21 Rate of Frequency Change Protection
848 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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