ABB RELION REX640 Technical Manual page 1166

Protection related functions
Value of setting CB
failure mode
In addition, the function is immediately reset if:
Start latching mode is set to "Level sensitive", and the START signal is
•
deactivated. The recommended setting value is "Rising edge".
• The BLOCK input is activated.
From Level detector 1
From Level detector 2
CB failure trip mode
"2 out of 4"
From Level detector 2
From Level detector 1
CB failure trip mode
"1 out of 4"
CB failure trip mode
"1 out of 3"
Figure 661: Start logic
Timer 1
Once activated, the timer runs until the set
characteristic is according to DT. When the operation timer has reached the value
set with
Timer 2
Once activated, the timer runs until the set
time characteristic is according to DT. When the operation timer has reached the set
maximum time value
1166
Value of setting CB
failure trip mode
CB failure mode "Both(OR)"
CB failure mode "Both(AND)"
2 or 3 ph
OR
I >
1 ph
AND
I >
0
I >
0
OR
I >
CB failure mode "Current"
POSCLOSE
CB failure mode "Breaker
status"
150.0
START
Start latching mode
"Level sensitive"
BLOCK
Retrip time , the retrip logic is activated. A typical setting is 0...50 ms.
CB failure delay , the backup trip logic is activated. The value of
Start logic reset condition
• The residual current drops below
value Res setting and (at least) two pha-
ses are below
AND
AND
OR
AND
AND OR
AND
AND
AND
TON
ms
AND
Retrip time value has elapsed. The time
CB failure delay value has elapsed. The
1MRS759142 F
Current
Current value setting.
AND
Set
Enable timer
Reset
OR
REX640
Technical Manual