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1MRK 505 288-UEN A
7.4.8
Technical manual
BUTripMode
1 out of 3
2 out of 4
1
1 out of 4
BFP Started L1
IN
a
a>b
IN>
b
Current High L2
From other
Current High L3
phases
Current High L1
BFP Started L1
t
BFP Started L2
From other
phases
BFP Started L3
IEC16000503 V1 EN
Figure 49:
Simplified logic scheme of the back-up trip function
Internal logical signals Current High L1, Current High L2, and Current High L3 have
logical value 1 when current in respective phase has magnitude larger than setting
parameter IP>.
Technical data
Table 54:
CCRBRF technical data
Function
Range or value
Operate phase
(5-200)% of
current
Reset ratio, phase
> 95%
current
Operate residual
(2-200)% of
current
Reset ratio, residual
> 95%
current
Phase current level
(5-200)% of
for blocking of
contact function
Reset ratio
> 95%
Table continues on next page
OR
AND
Current High L1
AND
Contact Closed L1
O R
AND
t2
t
AND
AND
O R
OR
Backup Trip L2
From other
phases
Backup Trip L3
AND
AND
OR
AND
lBase
lBase
lBase
Section 7
Current protection
OR
30 ms
AND
OR
OR
60 s
200 ms
OR
OR
Accuracy
± 1.0% of I
at I £ I
r
r
± 1.0% of I at I > I
r
-
± 1.0% of I
at I £ I
r
r
± 1.0% of I at I > I
r
-
± 1.0% of I
at I £ I
r
r
± 1.0% of I at I > I
r
-
Backup Time Out L1
Backup Trip L1
TRBU
IEC16000503-1-en.vsd
117
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