Siemens SIPROTEC 5 Manual page 94

System Functions
3.6 Other Functions
•
Chatter test time
During this second test time, the number of times a signal changes its state is checked once again. The
time begins when the chatter dead time expires. If the number of status changes is within the
permissible limits, the signal is released. Otherwise, an additional dead time begins, unless the maximum
number of chatter checks has been reached.
Enter a number between 2 and 65535 in this field. The number entered corresponds to the time in
seconds. An entry is possible here only if the number of chatter checks does not equal 0.
As soon as chatter blocking is set, the corresponding signal is assigned the oscillatory quality, and a corre-
sponding indication is entered in the operational log.
The following image shows an example of the usage of chatter blocking on a single-point indication (type
SPS). The number of permitted status changes is set to 5. After 5 status changes occur, the signal is set to the
original state and it is given the quality oscillatory.
[dwflatsp-140212-01.tif, 1, en_US]
Figure 3-41
94
Signal Change During Chatter Blocking
SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017