ABB REC670 Product Manual page 12

Bay control REC670
Pre-configured
Product version: 1.1
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 SLGGIO
The logic rotating switch for function
selection and LHMI presentation function
(SLGGIO) (or the selector switch function
block) is used to get a selector switch
functionality similar with 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 extended purchase portfolio. The virtual
selector switches eliminate all these problems.
Selector mini switch VSGGIO
Selector mini switch (VSGGIO) function
block is a multipurpose function used in the
configuration tool in PCM600 for a variety of
applications, as a general purpose switch.
VSGGIO can be controlled from the menu or
from a symbol on the single line diagram
(SLD) on the local HMI.
Single point generic control 8 signals
SPC8GGIO
The Single point generic control 8 signals
(SPC8GGIO) 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 complicated function blocks that
have the capability to receive commands (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,
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1MRK 511 192-BEN B
such as binary inputs and SPGGIO function
blocks.
Scheme communication
Scheme communication logic for distance
or overcurrent protection ZCPSCH
To achieve instantaneous fault clearance for
all line faults, a scheme communication logic
is provided. All types of communication
schemes for example, permissive
underreaching, permissive overreaching,
blocking, unblocking, intertrip are available.
The built-in communication module (LDCM)
can be used for scheme communication
signaling when included.
Current reversal and weak-end infeed logic
for distance protection ZCRWPSCH
The current reversal function is used to
prevent unwanted operations due to current
reversal when using permissive overreach
protection schemes in application with
parallel lines when the overreach from the
two ends overlap 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,
received carrier signal together with local
under voltage criteria and no reverse zone
operation gives an instantaneous trip. The
received signal is also echoed back to
accelerate the sending end.
Three phase or phase segregated scheme
logic is available.
Local acceleration logic ZCLCPLAL
To achieve fast clearing of faults on the
whole line, when no communication channel
is available, local acceleration logic
(ZCLCPLAL) can be used. This logic enables
fast fault clearing during certain conditions,
but naturally, it can not fully replace a
communication channel.
The logic can be controlled either by the
autorecloser (zone extension) or by the loss-of-
load current (loss-of-load acceleration).
Issued: June 2010
ABB