Time
The fault
occurs
Protection
operate time
Trip and Start
CCRBRF
Normal t
cbopen
Margin
Retrip delay t1
t
cbopen
after re-trip
t
BFPreset
Minimum back-up trip delay t2
Critical fault clearance time for stability
IEC05000479_2_en.vsd
IEC05000479 V2 EN-US
Figure 48:
Time sequence
t2MPh
: Time delay of the back-up trip at multi-phase start. The critical fault
clearance time is often shorter in case of multi-phase faults, compared to single
phase-to-earth faults. Therefore there is a possibility to reduce the back-up trip
delay for multi-phase faults. Typical setting is 90 – 150 ms.
t3
: Additional time delay to
t2
for a second back-up trip TRBU2. In some
applications there might be a requirement to have separated back-up trip functions,
tripping different back-up circuit breakers.
tCBAlarm
: Time delay for alarm in case of indication of faulty circuit breaker.
There is a binary input CBFLT from the circuit breaker. This signal is activated
when internal supervision in the circuit breaker detect that the circuit breaker is
unable to clear fault. This could be the case when gas pressure is low in a SF6
circuit breaker. After the set time an alarm is given, so that actions can be done to
repair the circuit breaker. The time delay for back-up trip is bypassed when the
CBFLT is active. Typical setting is 2.0 seconds.
tPulse
: Trip pulse duration. This setting must be larger than the critical impulse
time of circuit breakers to be tripped from the breaker failure protection. Typical
setting is 200 ms.
7.6
Pole discordance protection CCPDSC
IP14516-1 v5
1MRK 505 388-UEN B
Section 7
Current protection
Busbar protection REB650 2.2 IEC
127
Application manual
Summary of Contents for REB650
Page 1: ...RELION 650 SERIES Busbar protection REB650 Version 2 2 Application manual...
Page 2: ......
Page 18: ...12...
Page 28: ...22...
Page 38: ...32...
Page 78: ...72...
Page 96: ...90...
Page 136: ...130...
Page 150: ...144...
Page 156: ...150...
Page 232: ...226...
Page 278: ...272...
Page 298: ...292...
Page 310: ...304...
Page 320: ...314...
Page 321: ...315...