ABB PFCL201CE 50KN Programmable Logic Controller
Busbar differential protection
This protection function is intended for fast and selective
tripping of faults within protected zone. For each current input,
the CT ratio can be set from the front HMI or via the parametersetting tool, PCM600. In this way adaptation to different CT
ratios is provided in the simplest way. The minimum pick-up
value for the differential current is then set to give a suitable
sensitivity for all internal faults. This setting is made directly in
primary amperes. For busbar protection applications typical
setting value for the minimum differential operating current is
from 50% to 150% of the biggest CT. The settings can be
changed from the front HMI or via the parameter-setting tool,
PCM600.
All current inputs are indirectly provided with a restraint feature.
The operation is based on the well-proven RADSS percentage
restraint stabilization principle, with an extra stabilization
feature to stabilize for very heavy CT saturation. Stability for
external faults is guaranteed if a CT is not saturated for at least
two milliseconds during each power system cycle. It is also
possible to add external tripping criteria by binary signal.
The trip command from the differential protection including
sensitive differential protection and circuit breaker failure
backup-trip commands can be set either as self-resetting or
latched. In second case the manual reset is needed in order to
reset the individual bay trip output contacts.
PLC module, programmable controller, CPU module, IO module, DO module, AI module, DI module, network communication module,
Ethernet module, motion control module, analog input module, analog output module, digital input module, digital output module
Module, redundant module, power module, relay output module, relay input module, processor module.
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This configuration includes only busbar protection for double busbar-single breaker stations, where Zone Selection is done by using a and b auxiliary contacts from every disconnector and/or circuit breaker. Thus full disconnector/breaker supervision is available. This configuration is available for only three REB670 variants (that is A31, B21 and B31). It shall be noted that optional functions breaker failure protection CCRBRF, end fault protection and overcurrent protection PH4SPTOC can be ordered together with this configuration, but they will not be pre-configured. Thus these optional functions shall be configured by the end user.
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