ABB RELION 620 Series Technical Manual page 539

1MAC504801-IB E
620 series ANSI
Technical Manual
50G
From Level detector 2
CB failu re trip mode
"2 out of 4"
50P
From Level detector 1
50G
From Level detector 2
CB failu re trip mode
"1 out of 4"
50P
From Level detector 1
CB failu re mo de "Cu rrent"
POSCLOSE
CB failu re mo de "Br eaker
status"
PICKUP
150.0 ms
Timer 1 elapsed
From Timer 1
Timer 2 elapsed
From Timer 2
BLOCK
GUID-61D73737-798D-4BA3-9CF2-56D57719B03D-ANSI V2 EN
Figure 254: 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:
CBfailuredelay ≥ Retriptime t
A070693 V3 EN
Protection-related functions
AND
OR
AND
AND
AND
TON
AND
AND
+ + t + t
cbopen BFP reset _ margin
Section 5
AND
Set
Enable timer
Reset
OR
(Equation 87)
533