ABB RELION REX640 Technical Manual page 1076

Section 5
Protection related functions
1070
• 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.
CB failure mode "Both(OR)"
CB failure mode "Both(AND)"
2 or 3 ph
I >
1 ph
From Level detector 1
AND
I >
0
From Level detector 2
CB failure trip mode
"2 out of 4"
I >
0
From Level detector 2
I >
From Level detector 1
CB failure trip mode
"1 out of 4"
CB failure trip mode
"1 out of 3"
CB failure mode "Current"
POSCLOSE
CB failure mode "Breaker
status"
150.0
START
Start latching mode
"Level sensitive"
BLOCK
GUID-73916E8D-5FE5-44C9-BE64-BB98ED02691F V1 EN
Figure 574: Start logic
Timer 1
Once activated, the timer runs until the set Retrip time value has elapsed. The time
characteristic is according to DT. When the operation timer has reached the value set
with Retrip time, the retrip logic is activated. A typical setting is 0...50 ms.
Timer 2
Once activated, the timer runs until the set CB failure delay value has elapsed. The
time characteristic is according to DT. When the operation timer has reached the set
maximum time value CB failure delay, the backup trip logic is activated. The value of
this setting is made as low as possible at the same time as any unwanted operation is
avoided. A typical setting is 90 - 150 ms, which is also dependent on the retrip timer.
The minimum time delay for the CB failure delay can be estimated as:
AND
OR
AND
OR
AND
OR
AND OR
AND
AND
AND
TON
ms
AND
1MRS759142 C
AND
Set
Enable timer
Reset
OR
REX640
Technical Manual