ABB Relion 670 Series Applications Manual page 181

1MRK 511 401-UEN Rev. K


final

operate
Here
At t=0
At next execution, θ
Therefore,
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
t
lockout release _
EQUATION1177 V1 EN-US
where:
t
lockout_release
Q
lockout_release
Consider that the current heat content θ

lockout release _
t
lockout release _
8.9 Breaker failure protection CCRBRF
8.9.1 Function revision history
Document
revision
A
B
C
Table continues on next page
Bay control REC670
Application manual
2
 
1800

 
2677685.95
 
1. 1
   
(1.2 1000 1.1 1.2)
Q > Q
final n
 
 
ThetaInit
n init
=1254528 and θ
n-1
  
t 90 ln((2677685.95 2509056) / (2677685.95 1254555.04)) 192 min
operate
æ
Q - Q
t final
= - × ç
ln
ç
Q
è
  
0.6 2509056 1505433.6
  
90 ln((2677685.95 1505433.6) / (2677685.95 2700000)) 244 min
Product History
revision
2.2.1 I>BlkCBPos setting functionality correction.
2.2.1 -
2.2.2 -
© Copyright 2017 Hitachi Power Grids. All rights reserved

2
2509056

  
0.5 2509056 1254528
operate
=1254555.04.
n

ResLo .
ö
lockout release _
÷
÷
- Q
ø
final n
is the time to lockout release
is the lockout release level heat content =
is 2700000 and the cooling system is still
n

Current protection

 
ResLo × θ
operate
 
GUID-3A043295-3AE3-437E-BBE9-D7FD6F349892 v1
Section 8
(Equation 66)
ON , then:
IP14514-1 v6
175