ABB Relion 670 Series Product Manual page 34

Line differential protection RED670 2.0
Product version: 2.0
LOCREMCTRL to the Bay control QCBAY function block. The
parameter ControlMode in function block LOCREM is set to
choose if the switch signals are coming from the local HMI or
from an external hardware switch connected via binary inputs.
Logic rotating switch for function selection and LHMI
presentation SLGAPC
The logic rotating switch for function selection and LHMI
presentation SLGAPC (or the selector switch function block) is
used to get an enhanced selector switch functionality
compared to the one provided by a hardware selector switch.
Hardware selector switches are used extensively by utilities, in
order to have different functions operating on pre-set values.
Hardware switches are however sources for maintenance
issues, lower system reliability and an extended purchase
portfolio. The selector switch function eliminates all these
problems.
Selector mini switch VSGAPC
The Selector mini switch VSGAPC function block is a
multipurpose function used for a variety of applications, as a
general purpose switch.
VSGAPC can be controlled from the menu or from a symbol on
the single line diagram (SLD) on the local HMI.
Generic communication function for Double Point indication
DPGAPC
Generic communication function for Double Point indication
DPGAPC function block is used to send double indications to
other systems, equipment or functions in the substation
through IEC 61850-8-1 or other communication protocols. It is
especially 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 LED's 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.
AutomationBits, command function for DNP3.0 AUTOBITS
AutomationBits 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 signals
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.
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11. 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 ZC1PPSCH
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 channels (in each subsystem) are
available for the distance protection communication.
The main purpose of the Phase segregated scheme
communication logic for distance protection (ZC1PPSCH)
function is to supplement the distance protection function 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.
ZC1PPSCH can be completed with the current reversal and
WEI logic for phase segregated communication, when found
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 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
1MRK505310-BEN C
ABB