Logic - ABB REL670 Product Manual

Line distance protection REL670 2.2
Product version: 2.2
Direct transfer trip DTT
Low active power and power factor protection LAPPGAPC
Low active power and power factor protection (LAPPGAPC)
function measures power flow. It can be used for protection and
monitoring of:
• phase wise low active power
• phase wise low power factor
• phase wise reactive power and apparent power as service
values
Following features are available:
• Definite time stage for low active power protection
• Definite time stage for low power factor protection
• Individual enabling of Low active power and Low power
factor functions
• Low active power trip with 2 selection modes '1 out of 3'
and '2 out of 3'
• Phase wise calculated values of apparent power, reactive
power, active power and power factor are available as
service values
• Insensitive to small variations in voltage and current
Compensated over and undervoltage protection COUVGAPC
Compensated over and undervoltage protection (COUVGAPC)
function calculates the remote end voltage of the transmission
line utilizing local measured voltage, current and with the help of
transmission line parameters, that is, line resistance, reactance,
capacitance and local shunt reactor. For protection of long
transmission line for in zone faults, COUVGAPCcan be
incorporated with local criteria within direct transfer trip logic to
ensure tripping of the line only under abnormal conditions.
Sudden change in current variation SCCVPTOC
Sudden change in current variation (SCCVPTOC) function is a
fast way of finding any abnormality in line currents. When there
is a fault in the system, the current changes faster than the
voltage. SCCVPTOC finds abnormal condition based on phase-
to-phase current variation. The main application is as a local
criterion to increase security when transfer trips are used.
Carrier receive logic LCCRPTRC
In Direct transfer trip (DTT) scheme, the received CR signal
gives the trip to the circuit breaker after checking certain local
criteria functions in order to increase the security of the overall
tripping functionality. Carrier receive logic (LCCRPTRC)
function gives final trip output of the DTT scheme.
Features:
• Carrier redundancy to ensure security in DTT scheme
• Blocking function output on CR Channel Error
• Phase wise trip outputs
ABB
Negative sequence overvoltage protection LCNSPTOV
Negative sequence components are present in all types of fault
condition. Negative sequence voltage and current get high
values during unsymmetrical faults.
Zero sequence overvoltage protection LCZSPTOV
Zero sequence components are present in all abnormal
conditions involving earth. They can reach considerably high
values during earth faults.
Negative sequence overcurrent protection LCNSPTOC
Negative sequence components are present in all types of fault
condition. They can reach considerably high values during
abnormal operation.
Zero sequence overcurrent protection LCZSPTOC
Zero sequence components are present in all abnormal
conditions involving earth. They have a considerably high value
during earth faults.
Three phase overcurrent LCP3PTOC
Three phase overcurrent (LCP3PTOC) is designed for
overcurrent conditions.
Features:
• Phase wise start and trip signals
• Overcurrent protection
• Phase wise RMS current is available as service values
• Single definite time stage trip function.
Three phase undercurrent LCP3PTUC
Three phase undercurrent function (LCP3PTUC) is designed for
detecting loss of load conditions.
Features:
• Phase wise start and trip signals
• Phase wise RMS current is available as service values
• Single definite time stage trip function

14. Logic

Tripping logic SMPPTRC
A function block for protection tripping is always provided as
basic for each circuit breaker involved in the tripping of the fault.
It provides a settable pulse prolongation to ensure a trip pulse
of sufficient length, as well as all functionality necessary for
correct co-operation with autoreclosing functions.
The trip function block also includes a settable latch
functionality and circuit breaker closing circuit lockout.
The trip function can provide directional data from different
application functions. All start and directional outputs are
mapped to the logical node data model.
1MRK 506 372-BEN -
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