IEC09000979-4-en.vsd
BFP Started L1
t
t2
AND
OR
BFP Started L2
BFP Started L3
From other
phases
OR
OR
AND
t
t2MPh
CBFLT
AND
AND
a
b
a>b
IN
IN>
1 out of 4
AND
OR
1 out of 3
Current High L2
Current High L3
From other
phases
AND
Current High L1
OR
Contact Closed L1
OR
Backup Trip L1
tPulse
Backup Trip L2
OR
From other
phases
Backup Trip L3
TRBU
OR
S
R
SR
Q
AND
t
t3
tPulse
TRBU2
OR
2 out of 4
BUTripMode
1
AND
OR
Current high L1
BFP Started L1
30ms
AND
Backup Time Out L1
IEC09000979 V4 EN-US
Figure 97: Simplified logic scheme of the back-up trip logic function
The internal logical signals Current High L1, Current High L2, Current High L3
have logical value 1 when the current in the respective phase has the magnitude
larger than the setting parameter IP>.
8.6.8 Technical data
IP10269-1 v1
M12353-1 v13
Table 108: CCRBRF technical data
Function
Range or value Accuracy
Operate phase current (5-200)% of
lBase
±1.0% of I
r
at I £ I
r
±1.0% of I at I > I
r
Reset ratio, phase current > 95% -
Operate residual current (2-200)% of
lBase
±1.0% of I
r
at I £ I
r
±1.0% of I at I > I
r
Reset ratio, residual current > 95% -
Phase current level for blocking of contact
function
(5-200)% of
lBase
±1.0% of I
r
at I £ I
r
±1.0% of I at I > I
r
Reset ratio > 95% -
Operate time for current detection 10 ms typically -
Reset time for current detection 15 ms maximum -
Table continues on next page
Section 8 1MRK 505 394-UEN A
Current protection
218 Line differential protection RED650 2.2 IEC
Technical manual
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