ABB REL650 Product Manual page 19

Line distance protection REL650 2.2
Product version: 2.2.1
SAPFRC is provided with an undervoltage blocking. The
operation is based on positive sequence voltage
measurement and requires two phase-phase or three phase-
neutral voltages to be connected.
7. Secondary system supervision
Current circuit supervision CCSSPVC
Open or short circuited current transformer cores can cause
unwanted operation of many protection functions such as
differential, earth-fault current and negative-sequence current
functions.
Current circuit supervision (CCSSPVC) compares the residual
current from a three 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
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.
The negative sequence detection algorithm is recommended
for IEDs used in isolated or high-impedance earthed
networks. It is based on the negative-sequence quantities.
The zero sequence detection is recommended for IEDs used
in directly or low impedance earthed networks. It is based on
the zero sequence measuring quantities.
The selection of different operation modes is possible by a
setting parameter in order to take into account the particular
earthing of the network.
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.
8. Control
Synchrocheck, energizing check, and synchronizing
SESRSYN
ABB
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.
M12444-3 v10
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 can run asynchronously, a synchronizing
feature is also provided. The main purpose of the
synchronizing feature is to provide controlled closing of circuit
breakers when two asynchronous systems are in phase and
can be connected. The synchronizing feature evaluates
voltage difference, phase angle difference, slip frequency and
frequency rate of change before issuing a controlled closing
SEMOD113820-4 v12
of the circuit breaker. Breaker closing time is a setting.
Autorecloser SMBRREC
The auto reclosing function provides:
• high-speed and/or delayed auto reclosing
• single and/or three phase auto reclosing
• support for single or multi-breaker applications.
The auto recloser can be used for delayed busbar restoration.
Up to five reclosing shots can be performed. The first shot
can be single-, two-, and /or three-phase depending on the
type of the fault and the selected auto reclosing mode.
Several auto reclosing functions can be provided for multi-
breaker arrangements. A priority circuit allows one circuit
breaker to reclose first and the second will only close if the
fault proved to be transient.
Each auto reclosing function can be configured to co-operate
with the synchrocheck function.
Switch controller SCSWI
The Switch controller (SCSWI) initializes and supervises all
functions to properly select and operate switching primary
apparatuses. The Switch controller may handle and operate
on one multi-phase device or up to three one-phase devices.
Circuit breaker SXCBR
The purpose of Circuit breaker (SXCBR) is to provide the
actual status of positions and to perform the control
operations, that is, pass all the commands to primary
apparatuses in the form of circuit breakers via binary output
boards and to supervise the switching operation and position.
1MRK 506 384-BEN A
M12480-3 v16
M12390-3 v16
M13486-3 v8
M13489-3 v6
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