ABB REB650 - Breaker Failure Protection CCRBRF; Identification

Here
final n
Q > Q
At t=0
0.5 2509056 1254528
n init oper ate
ThetaInit

    
At next execution, θ
n-1
=1254528 and θ
n
=1254555.04.
Therefore,
90 ln((2677685.95 2509056) / ( 2677685.95 1254555.04)) 192min
operate
t     
After the trip, a lockout is released to inhibit reconnecting the tripped circuit. The
output lockout signal LOCKOUT is activated when the temperature of the object is
greater than the set lockout release temperature setting ResLo.
_
_
ln
final lockout release
lockout release
final n
t t
æ ö
Q - Q
= - ×
ç ÷
ç ÷
Q - Q
è ø
EQUATION1177 V1 EN-US (Equation 29)
where:
t
lockout_release
is the time to lockout release
Q
lockout_release
is the lockout release level heat content = ResLo × θ
operate
Consider that the current heat content θ
n
is 2700000 and the cooling system is still
ON, then:
_
0.6 2509056 1505433.6
lockout release

 
_
90 ln((2677685.95 1505433.6) / (2677685.95 2700000)) 244min
lockout release
t     
7.5 Breaker failure protection CCRBRF
IP14514-1 v6
7.5.1 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
3I>BF
SYMBOL-U V1 EN-US
50BF
1MRK 505 388-UEN B Section 7
Current protection
Busbar protection REB650 2.2 IEC 123
Application manual