ANSI16000503-1-en.vsd
BFP Started A
AND
BFP Started B
BFP Started C
From other
phases
OR
OR
AND
AND
a
b
a>b
IN
IN>
1 out of 4
AND
OR
1 out of 3
Current High B
Current High C
From other
phases
AND
Current High A
OR
Contact Closed A
OR
Backup Trip A
200 ms
Backup Trip B
OR
From other
phases
Backup Trip C
TRBU
OR
2 out of 4
BUTripMode
1
AND
OR
Current High A
BFP Started A
30 ms
Backup Time Out A
AND
AND
AND
OR
OR
0
0-t2
0
60 s
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
.
8.5.8
Technical data
Table 114:
CCRBRF (50BF) technical data
Function
Range or value
Accuracy
Operate phase current
(5-200)% of
lBase
±
1.0% of I
n
at I
£
I
n
±
1.0% of I at I > I
n
Reset ratio, phase current > 95%
-
Operate residual current
(2-200)% of
lBase
±
1.0% of I
n
at I
£
I
n
±
1.0% of I at I > I
n
Reset ratio, residual
current
> 95%
-
Phase current pickup for
blocking of contact
function
(5-200)% of
lBase
±
1.0% of I
n
at I
£
I
n
±
1.0% of I at I > I
n
Table continues on next page
Section 8
1MRK 502 048-UUS A
Current protection
246
Technical manual
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