ABB Network Partner AB
Breaker-failure protection
Version 1.0-00
1MRK 580 171-XEN
Page 5 - 88
Fig. 5 Breaker-failure protection
Fig. 6 Current detector, ASD and RMS measurement.
2.4 Retrip functions The retrip function of the original circuit breaker is set at one of three
options:
Setting: The retrip...
Off function is not executed.
I> check occurs with a current check.
No I> check occurs without a current check.
The retrip timer t1 can be set from 0 to 150 ms.
A trip pulse length of 150 ms is generated.
(X80171-5)
t
t1
&
t
&
ASD
RMS
Back-up
trip
Current
detector
Current
Start
(X80171-6)
High-pass
filtering
Recti-
fying
Creation of
stabilizing
signal
Decision
through
comparison
Decision
through
comparison
RMS
calculation
Current
samples
ASD
RMS
To Next Page
Loading...
Need help?
General
