ABB REQ650 Product Manual - page 14
with the neutral point current on a separate input taken from
another set of cores on the current transformer.
Current circuit supervision (CCSSPVC) compares the residual
current from a two phase set of current transformer cores
with the neutral point current on a separate input taken from
another set of cores on the current transformer.
A detection of a difference indicates a fault in the circuit and
is used as alarm or to block protection functions expected to
give inadvertent tripping.
Fuse failure supervision FUFSPVC
SEMOD113820-4 v11
The aim of the fuse failure supervision function FUFSPVC is to
block voltage measuring functions at failures in the secondary
circuits between the voltage transformer and the IED in order
to avoid inadvertent operations that otherwise might occur.
The fuse failure supervision function basically has three
different detection methods, negative sequence and zero
sequence based detection and an additional delta voltage
and delta current detection.
A criterion based on delta current and delta voltage
measurements can be added to the fuse failure supervision
function in order to detect a three phase fuse failure, which in
practice is more associated with voltage transformer
switching during station operations.
7. Control
Synchrocheck, energizing check, and synchronizing
SESRSYN
M12480-3 v15
The Synchronizing function allows closing of asynchronous
networks at the correct moment including the breaker closing
time, which improves the network stability.
Synchrocheck, energizing check, and synchronizing
SESRSYN function checks that the voltages on both sides of
the circuit breaker are in synchronism, or with at least one
side dead to ensure that closing can be done safely.
The synchrocheck and energizing check function checks that
the voltages on both sides of the circuit breaker are in
synchronism, or with at least one side dead to ensure that
closing can be done safely.
SESRSYN function includes a built-in voltage selection
scheme for double bus and 1½ breaker or ring busbar
arrangements.
Manual closing as well as automatic reclosing can be
checked by the function and can have different settings.
For systems, which are running asynchronous, a
synchronizing function is provided. The main purpose of the
synchronizing function is to provide controlled closing of
circuit breakers when two asynchronous systems are going to
be connected. The synchronizing function evaluates voltage
difference, phase angle difference, slip frequency and
frequency rate of change before issuing a controlled closing
of the circuit breaker. Breaker closing time is a parameter
setting.
M12390-3 v14
The autorecloser SMBRREC function provides high-speed
and/or delayed auto-reclosing for single breaker applications.
Up to five three-phase reclosing attempts can be included by
parameter setting.
autoreclosing function is configured to co-operate with the
synchrocheck function.
The autorecloser SMBRREC function provides high-speed
and/or delayed auto-reclosing for single or multi-breaker
applications. The autoreclosing can be used for delayed
busbar restoration. Two autoreclosers, one for each busbar,
can be provided.
Up to five reclosing attempts can be included by parameter
setting.
Each autoreclosing function is configured to co-operate with
the synchrocheck function.
The autoreclosing function provides high-speed and/or
delayed three pole autoreclosing.
Bay control QCBAY
M13447-3 v7
The Bay control QCBAY function is used together with Local
remote and local remote control functions to handle the
selection of the operator place per bay. QCBAY also provides
blocking functions that can be distributed to different
apparatuses within the bay.
Local remote LOCREM/Local remote control LOCREMCTRL
M17086-3 v8
The signals from the local HMI or from an external local/
remote switch are connected via the function blocks
LOCREM and 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
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.
1MRK 505 358-BEN B
Breaker protection REQ650 2.1 IEC
Product version: 2.1
14
ABB