8.7.8 Technical data
IP13072-1 v1
M13266-2 v9
Table 255: TRPTTR (49) technical data
Function Range or value Accuracy
Base current 1 and 2 (30–250)% of
IBase
±1.0% of I
n
Trip time:
EQUATION1356 V3 EN-US (Equation 141)
I = actual measured current
Ip = load current before
overload occurs
ITrip = steady state operate
current level in % of
IBasex
Time constant τ = (0.10–
500.00) minutes
±5.0% or ±200 ms whichever is greater
Alarm pickup 1 and 2 (50–99)% of heat content trip
value
±2.0% of heat content trip
Trip 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
8.8 Breaker failure protection CCRBRF(50BF)
IP14514-1 v6
8.8.1 Identification
M14878-1 v5
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Breaker failure protection, 3-phase
activation and output
CCRBRF
SYMBOL-U V1 EN-US
50BF
8.8.2 Functionality
M11550-6 v16
Breaker failure protection (CCRBRF) ensures a fast backup tripping of the surrounding breakers in
case the own breaker fails to open. CCRBRF (50BF) can be current-based, contact-based or an
adaptive combination of these two conditions.
A current check with extremely short reset time is used as check criterion to achieve high security
against inadvertent operation.
Contact check criteria can be used where the fault current through the breaker is small.
Section 8 1MRK 502 066-UUS B
Current protection
524
Technical manual
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