Here
final
n
Q
> Q
At t=0
0.5 2509056
1254528
n
init
operate
ThetaInit
At next execution, θ
n-1
=1254528 and θ
n
=1254555.04.
Therefore,
90 ln((2677685.95
2509056) / (2677685.95 1254555.04))
192 min
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))
244 min
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
Summary of Contents for REB650
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