ΣI*-Method Stage
Description
Logic of the Stage
[LoCBWIxS, 3, en_US]
Figure 9-24
Logic of the ΣI
x
-Method Stage
Determination of the Tripping/Opening Current Value
RMS values of the fundamental components are stored for each phase in a buffer during the time between the
start criterion and the pole-opening-starts criterion. With the coming pole-opening-starts criterion, the latest
value in the buffer is searched for whose value is above the setting of parameter
Current thresh. CB
open
. The 20 ms prior value is used as tripping/opening current for further calculation.
If no value within the buffer is above the setting value, this circuit-breaker opening affects only the mechan-
ical lifetime of the circuit breaker and is consequently not considered by this method.
9.6.4
9.6.4.1
Measured Values, Energy Values, and Supervision of the Primary System
9.6 Circuit-Breaker Wear Monitoring
1024
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
Summary of Contents for 6MD85
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