Selector Mini Switch Vsgapc; Single Point Generic Control 8 Signals Spc8Gapc; Single Command, 16 Signals; Tripping Logic Smpptrc - ABB RET670 Product Manual

Transformer protection RET670 2.0
Product version: 2.0
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.
11. Scheme communication
Scheme communication logic for residual overcurrent
protection ECPSCH
To achieve fast fault clearance of earth faults on the part of the
line not covered by the instantaneous step of the residual
overcurrent protection, the directional residual overcurrent
protection can be supported with a logic that uses
communication channels.
ABB
In the directional scheme, information of the fault current
direction must be transmitted to the other line end. With
directional comparison, a short operate time of the protection
including a channel transmission time, can be achieved. This
short operate time enables rapid autoreclosing function after
the fault clearance.
The communication logic module for directional residual current
protection enables blocking as well as permissive under/
overreaching, and unblocking schemes. The logic can also be
supported by additional logic for weak-end infeed and current
reversal, included in Current reversal and weak-end infeed logic
for residual overcurrent protection ECRWPSCH function.
Current reversal and weak-end infeed logic for residual
overcurrent protection ECRWPSCH
The Current reversal and weak-end infeed logic for residual
overcurrent protection ECRWPSCH is a supplement to Scheme
communication logic for residual overcurrent protection
ECPSCH.
To achieve fast fault clearing for all earth faults on the line, the
directional earth fault protection function can be supported with
logic that uses tele-protection channels.
This is why the IEDs have available additions to the scheme
communication logic.
If parallel lines are connected to common busbars at both
terminals, overreaching permissive communication schemes
can trip unselectively due to fault current reversal. This
unwanted tripping affects the healthy line when a fault is cleared
on the other line. This lack of security can result in a total loss of
interconnection between the two buses. To avoid this type of
disturbance, a fault current reversal logic (transient blocking
logic) can be used.
Permissive communication schemes for residual overcurrent
protection can basically operate only when the protection in the
remote IED can detect the fault. The detection requires a
sufficient minimum residual fault current, out from this IED. The
fault current can be too low due to an opened breaker or high-
positive and/or zero-sequence source impedance behind this
IED. To overcome these conditions, weak-end infeed (WEI)
echo logic is used. The weak-end infeed echo is limited to 200
ms to avoid channel lockup.
12. Logic

Tripping logic SMPPTRC

A function block for protection tripping is provided 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 for evolving faults and breaker lock-out.
1MRK 504 141-BEN C
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