Logic - Hitachi Relion 670 Series Product Manual

Line differential protection RED670
Version 2.2
• 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, COUVGAPC can 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
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.
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GUID-C5CBB6A2-780D-4008-98E3-455A404D32CB v2
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GUID-C4F99554-88BC-4F11-9EFE-91BCA6ED1261 v2
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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

15. Logic

Tripping logic SMPPTRC
A function block for protection tripping and general start
indication is always provided as a basic function for each
circuit breaker. It provides a settable pulse prolongation
time 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 includes a settable latch function for
the trip signal and circuit breaker lockout.
The trip function can collect start and directional signals
from different application functions. The aggregated start
and directional signals are mapped to the IEC 61850 logical
node data model.
General start matrix block SMAGAPC
The Start Matrix (SMAGAPC) merges start and directional
output signals from different application functions and
creates a common start and directional output signal
(STDIR) to be connected to the Trip function.
The purpose of this functionality is to provide general start
and directional information for the IEC 61850 trip logic data
model SMPPTRC.
Trip matrix logic TMAGAPC
The trip matrix logic (TMAGAPC) function is used to route
trip signals and other logical output signals to different
output contacts on the IED.
1MRK 505 379-BEN R
GUID-F0C38DA1-2F39-46DE-AFFE-F919E6CF4A57 v2
GUID-AC4FF35E-5D86-421E-82C7-93F600E9F453 v2
GUID-E8EA5CE8-ED7A-4FA3-9DAC-83227D53387F v3
M12275-3 v15
GUID-BA516165-96DE-4CD9-979B-29457C7653C0 v3
M15321-3 v14
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