Scheme Communication - Hitachi Relion 670 Series Product Manual

Line differential protection RED670
Version 2.2
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, from a symbol
on the single line diagram (SLD) on the local HMI or from
Binary inputs.
Generic communication function for Double Point
indication DPGAPC
Generic communication function for Double Point indication
(DPGAPC) function block is used to send double point
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
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control high voltage apparatuses or for other user defined
functionality.
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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
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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
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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 (ZPCPSCH)
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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.
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ZPCPSCH 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
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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.
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