the voltage on the secondary side of transformers or
alternatively on a load point further out in the network.
Control of a single transformer, as well as control of up
to eight transformers in parallel is possible. For parallel
control of power transformers, three alternative
methods are available, the master-follower method, the
circulating current method and the reverse reactance
method. The first two methods require exchange of
information between the parallel transformers and this
is provided for within IEC 61850-8-1.
Voltage control includes many extra features such as
possibility of to avoid simultaneous tapping of parallel
transformers, hot stand by regulation of a transformer
in a group which regulates it to a correct tap position
even though the LV CB is open, compensation for a
possible capacitor bank on the LV side bay of a
transformer, extensive tap changer monitoring including
contact wear and hunting detection, monitoring of the
power flow in the transformer so that for example, the
voltage control can be blocked if the power reverses etc.
Logic rotating switch for function selection and
LHMI presentation SLGAPC
SEMOD114908-4 v9
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
SEMOD158756-5 v7
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
SEMOD55850-5 v7
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
SEMOD176462-4 v8
The Single point generic control 8 signals SPC8GAPC
function block is a collection of 8 single point
commands, designed to bring in commands from
REMOTE (SCADA) to those parts of the logic
configuration that do not need extensive command
receiving functionality (for example, SCSWI). 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
SEMOD158591-5 v7
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
M12446-6 v5
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
M13918-4 v10
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.
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
M13928-3 v7
The Current reversal and weak-end infeed logic for
residual overcurrent protection ECRWPSCH is a
1MRK 504 155-BEN F
Transformer protection RET670 2.1 IEC
38
ABB
