Retrip Functions - ABB REC 561 User Manual

1MRK 580 171-XEN
Page 5 - 88

2.4 Retrip functions

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