Table 122: CCRBRF Group settings (advanced)
Name Values (Range) Unit Step Default Description
I>BlkCont 5 - 200 %IB 1 20 I> in % of IBase block operation using
Function Mode Contact
t3 0.000 - 60.000 s 0.001 0.030 Additional time delay to t2 for a second
back-up trip
tCBAlarm 0.000 - 60.000 s 0.001 5.000 Time delay for alarm when faulty circuit
breaker indicated
Table 123: 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
7.8.6 Monitored data
PID-3562-MONITOREDDATA v7
Table 124: 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
7.8.7 Operation principle
M16914-3 v9
Breaker failure protection CCRBRF is initiated from the 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 is made after a set time
delay t1. 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 re-trip function can be done with or without CB position check according to
table
125.
1MRK 506 382-UEN A Section 7
Current protection
Line distance protection REL650 2.2 IEC 241
Technical manual
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