AND
AND
AND
AND
AND
OR
OR
OR
a
b
a>b
AND
a
b
a>b
AND
Time out A
BFP Started A
Reset A
52a_A
I_A
Current High A
Contact Closed A
ANSI09000977-1-en.vsd
FunctionMode
OR
OR
Current
Contact
Current and Contact
1
CB Closed A
Pickup_PH
Pickup_BlkCont
ANSI09000977 V1 EN
Figure 44:
Simplified logic scheme of the CCRBRF (50BF), CB position evaluation
200 ms
AND
AND
OR
OR
OR
TRRET_C
TRRET_B
BFP Started A
Retrip Time Out A
CB Closed A
TRRET
TRRET_A
52FAIL
CB Pos Check
No CBPos Check
AND
OR
From other
phases
ANSI09000978-2-en.vsd
RetripMode
1
0
0-t1
ANSI09000978 V2 EN
Figure 45:
Simplified logic scheme of the retrip logic function
Internal logical signals PU_A, PU_B, PU_C have logical value 1 when current in
respective phase has magnitude larger than setting parameter
Pickup_PH
.
7.4.8
Technical data
Table 52:
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%
-
Table continues on next page
1MRK 505 277-UUS C
Section 7
Current protection
111
Technical Manual
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