ABB REG670 - Monitored Data

Table 204: CCRBRF Non group settings (basic)
Name Values (Range) Unit Step Default Description
GlobalBaseSel 1 - 12 - 1 1 Selection of one of the Global Base Value
groups
8.8.6 Monitored data
Table 205: CCRBRF Monitored data
Name Type Values (Range) Unit Description
IL1 REAL - A Measured current in
phase L1
IL2 REAL - A Measured current in
phase L2
IL3 REAL - A Measured current in
phase L3
IN REAL - A Measured residual
current
8.8.7 Operation principle
Breaker failure protection CCRBRF is initiated from protection trip command, either
from protection functions within the IED or from external protection devices.
The start signal can be phase selective or general (for all three phases). Phase selective
start signals enable single pole re-trip function. This means that a second attempt to
open the breaker is done. The re-trip attempt can be made after a set time delay. For
transmission lines single pole trip and autoreclosing is often used. The re-trip function
can be phase selective if it is initiated from phase selective line protection. The re-trip
function can be done with or without current check. With the current check the re-trip
is only performed if the current through the circuit breaker is larger than the operate
current level.
The start signal can be an internal or external protection trip signal. This signal will
start the back-up trip timer. If the opening of the breaker is successful this is detected
by the function, by detection of either low current through RMS evaluation and a
special adapted current algorithm or by open contact indication. The special algorithm
enables a very fast detection of successful breaker opening, that is, fast resetting of the
current measurement. If the current and/or contact detection has not detected breaker
opening before the back-up timer has run its time a back-up trip is initiated.
Further the following possibilities are available:
• The minimum length of the re-trip pulse, the back-up trip pulse and the back-up
trip pulse 2 are settable. The re-trip pulse, the back-up trip pulse and the back-up
trip pulse 2 will however sustain as long as there is an indication of closed
breaker.
• In the current detection it is possible to use three different options: 1 out of 3
where it is sufficient to detect failure to open (high current) in one pole, 1 out of 4
Section 8 1MRK502052-UEN B
Current protection
410
Technical manual