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Line distance protection REL670
Version 2.2
position indications to other systems, equipment or
functions in the substation through IEC 61850-8-1 or other
communication protocols. It is especially intended to be
used in the interlocking station-wide logics.
Single point generic control 8 signals SPC8GAPC
The Single point generic control 8 signals (SPC8GAPC)
function block is a collection of 8 single point commands
that can be used for direct commands for example reset of
LEDs or putting IED in "ChangeLock" state from remote. In
this way, simple commands can be sent directly to the IED
outputs, without confirmation. Confirmation (status) of the
result of the commands is supposed to be achieved by other
means, such as binary inputs and SPGAPC function blocks.
The commands can be pulsed or steady with a settable
pulse time.
Automation bits, command function for DNP3.0
AUTOBITS
Automation bits function for DNP3 (AUTOBITS) is used
within PCM600 to get into the configuration of the
commands coming through the DNP3 protocol. The
AUTOBITS function plays the same role as functions
GOOSEBINRCV (for IEC 61850) and MULTICMDRCV (for
LON).
Single command, 16 inputs
The IEDs can receive commands either from a substation
automation system or from the local HMI. The command
function block has outputs that can be used, for example, to
control high voltage apparatuses or for other user defined
functionality.
14. Scheme communication
Scheme communication logic for distance or
overcurrent protection ZCPSCH
To achieve instantaneous fault clearance for all line faults,
scheme communication logic is provided. All types of
communication schemes for permissive underreaching,
permissive overreaching, blocking, delta based blocking,
unblocking and intertrip are available.
The built-in communication module (LDCM) can be used for
scheme communication signaling when included.
Phase segregated scheme communication logic for
distance protection ZPCPSCH
Communication between line ends is used to achieve fault
clearance for all faults on a power line. All possible types of
communication schemes for example, permissive
underreach, permissive overreach and blocking schemes
are available. To manage problems with simultaneous faults
on parallel power lines phase segregated communication is
needed. This will then replace the standard Scheme
communication logic for distance or Overcurrent protection
(ZCPSCH) on important lines where three communication
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channels (in each subsystem) are available for the distance
protection communication.
The main purpose of the Phase segregated scheme
communication logic for distance protection (ZPCPSCH)
function is to supplement the distance protection function
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such that:
• fast clearance of faults is also achieved at the line end for
which the faults are on the part of the line not covered by
its underreaching zone.
• correct phase selection can be maintained to support
single-pole tripping for faults occurring anywhere on the
entire length of a double circuit line.
To accomplish this, three separate communication
channels, that is, one per phase, each capable of
transmitting a signal in each direction is required.
ZPCPSCH can be completed with the current reversal and
WEI logic for phase segregated communication, when found
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necessary in Blocking and Permissive overreaching
schemes.
Current reversal and weak-end infeed logic for
distance protection ZCRWPSCH
The ZCRWPSCH function provides the current reversal and
weak end infeed logic functions that supplement the
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standard scheme communication logic. It is not suitable for
standalone use as it requires inputs from the distance
protection functions and the scheme communications
function included within the terminal.
On detection of a current reversal, the current reversal logic
provides an output to block the sending of the teleprotection
signal to the remote end, and to block the permissive
tripping at the local end. This blocking condition is
maintained long enough to ensure that no unwanted
operation will occur as a result of the current reversal.
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On verification of a weak end infeed condition, the weak
end infeed logic provides an output for sending the received
teleprotection signal back to the remote sending end and
other output(s) for local tripping. For terminals equipped for
single- and two-pole tripping, outputs for the faulted
phase(s) are provided. Undervoltage detectors are used to
detect the faulted phase(s).
Current reversal and weak-end infeed logic for phase
segregated communication ZPCWPSCH
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Current reversal and weak-end infeed logic for phase
segregated communication (ZPCWPSCH) function is used
to prevent unwanted operations due to current reversal
when using permissive overreach protection schemes in
application with parallel lines where the overreach from the
two ends overlaps on the parallel line.
The weak-end infeed logic is used in cases where the
apparent power behind the protection can be too low to
activate the distance protection function. When activated,
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1MRK 506 372-BEN Q
M13896-3 v15
SEMOD156473-5 v4
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