ABB REB650, Technical Manual

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7.3.8 Technical data
Table 45: TRPTTR (49) technical data
Function Range or value Accuracy
Base current 1 and 2 (30–250)% of IBase ± 1.0% of I
n
Operate time:
2 2
2 2
ln
p
b
I I
t
I I
t
æ ö
-
ç ÷
= ×
ç ÷
-
è ø
EQUATION1356 V1 EN
(Equation 24)
I = I
measured
I
p
= load current before overload
occurs
Time constant τ = (1–500)
minutes
IEC 60255–8, ±5% + 200 ms
Alarm pickup 1 and 2 (50–99)% of heat content trip
value
± 2.0% of heat content trip
Operate current (50–250)% of
IBase
± 1.0% of I
n
Reset level temperature (10–95)% of heat content trip ± 2.0% of heat content trip
7.4 Breaker failure protection 3-phase activation and
output CCRBRF (50BF)
7.4.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Breaker failure protection, 3-phase
activation and output
CCRBRF
3I>BF
SYMBOL-U V1 EN
50BF
7.4.2 Functionality
CCRBRF (50BF) can be current based, contact based, or an adaptive combination of
these two conditions.
Breaker failure protection (CCRBRF, 50BF) ensures fast back-up tripping of
surrounding breakers in case the protected breaker fails to open. CCRBRF (50BF) can
be current based, contact based, or an adaptive combination of these two conditions.
1MRK 505 277-UUS C
Section 7
Current protection
107
Technical Manual