Technical Data - ABB Relion Technical Manual

Section 8
Current protection
8.5.8
246
BUTripMode
1 out of 3
2 out of 4
1
1 out of 4
BFP Started A
IN
a
a>b
IN>
b
Current High B
From other
Current High C
phases
Current High A
BFP Started A
0-t2
0
O R
AND
AND
BFP Started B
From other
phases AND
BFP Started C
ANSI16000503 V1 EN
Figure 112: Simplified logic scheme of the back-up trip function
Internal logical signals Current High A, Current High B, and Current High C have logical
value 1 when current in respective phase has magnitude larger than setting parameter
Pickup_PH.

Technical data

Table 114: CCRBRF (50BF) technical data
Function
Operate phase current
Reset ratio, phase current
Operate residual current
Reset ratio, residual
current
Phase current pickup for
blocking of contact
function
Table continues on next page
OR
AND
Current High A
AND
Contact Closed A
O R
AND
60 s
AND
0
AND
OR
Backup Trip B
From other
phases
Backup Trip C
OR
Range or value
lBase
(5-200)% of
> 95%
(2-200)% of lBase
> 95%
(5-200)% of lBase
1MRK 502 048-UUS A
OR
Backup Time Out A
30 ms
AND
OR
OR
200 ms
OR
OR
ANSI16000503-1-en.vsd
Accuracy
± 1.0% of I at I £ I
n
± 1.0% of I at I > I
-
± 1.0% of I at I £ I
n
± 1.0% of I at I > I
-
± 1.0% of I at I £ I
n
± 1.0% of I at I > I
Backup Trip A
TRBU
n
n
n
n
n
n
Technical manual