ABB REC 561 User Manual

ABB Network Partner AB
Fuse-failure supervision function
Version 1.0-00
1MRK 580 169-XEN
Page 5 - 50
3Design
Fig. 1 Fuse failure supervision function - simplified block diagram
Figure 1 presents a simplified block diagram for the fuse failure supervi-
sion (FFS) function. The external signals perform their function even
when the function is switched off. The external signals are supposed to be
connected via the binary inputs of the terminal to the auxiliary contacts of
the line disconnector (FUSE-DISC) and miniature circuit breaker (FUSE-
MCB). Also, they can always operate in parallel with the zero-sequence
or negative-sequence measuring function.
An additional timer prolongs the presence of the FUSE-MCB signal for
50 ms to prevent the unnecessary operation of voltage-dependent func-
tions due to non-simultaneous closing of the main contacts on the minia-
ture circuit breaker.
FUSE-MCB
Operation=
1
V
UCHL1
t
5s
FUSE-VTF3PH
20ms
1
V
1
V
&
t
200ms
t
50ms
t
25ms
FUSE-DISC
UICH
Zeroseg
VTF0
&
Operation=
NegativeSeq
VTF2
&
UCHL2
UCHL3
&
VTF3PH-memory
&
t
25ms
1
V
t
50ms
t
50ms
&
1
V
1
V
FUSE-VTSU
FUSE-VTSZ
(X80169-1)

ABB REC 561 Specifications

General

Brand	ABB
Model	REC 561
Category	Touch terminals
Language	English