ABB RED650 Technical Manual page 321

1MRK 505 394-UEN A
Line differential protection RED650 2.2 IEC
Technical manual
Fuse failure supervision
External fuse failure signals or signals from a tripped fuse switch/MCB are
connected to binary inputs that are configured to the inputs of SESRSYN function
in the IED. Alternatively, the internal signals from fuse failure supervision can be
used when available. There are two alternative connection possibilities. Inputs
labelled OK must be connected if the available contact indicates that the voltage
circuit is healthy. Inputs labelled FF must be connected if the available contact
indicates that the voltage circuit is faulty.
The UB1OK/UB2OK and UB1FF/UB2FF inputs are related to the busbar voltage
and the ULN1OK/ULN2OK and ULN1FF/ULN2FF inputs are related to the line
voltage. Configure them to the binary input or function outputs that indicate the
status of the external fuse failure of the busbar and line voltages. In the event of a
fuse failure, the energizing check function is blocked. The synchronizing and the
synchrocheck function requires full voltage on both sides, thus no blocking at fuse
failure is needed.
Voltage selection
The voltage selection module including supervision of included voltage
transformers for the different arrangements is a basic part of the SESRSYN
function and determines the voltages fed to the Synchronizing, Synchrocheck and
Energizing check functions. This includes the selection of the appropriate Line and
Bus voltages and MCB supervision.
The voltage selection type to be used is set with the parameter CBConfig.
If No voltage sel. is set the voltages used will be U-Line1 and U-Bus1. This setting
is also used in the case when external voltage selection is provided. Fuse failure
supervision for the used inputs must also be connected.
The voltage selection function, selected voltages, and fuse conditions are used for
the Synchronizing, Synchrocheck and Energizing check inputs.
For the disconnector positions it is advisable to use (NO) a and (NC) b type
contacts to supply Disconnector Open and Closed positions but, it is also possible
to use an inverter for one of the positions.
If breaker or disconnector positions not are available for deciding if energizing is
allowed, it is considered to be allowed to manually energize. This is only allowed
for manual energizing in 1½ breaker and Tie breaker arrangements. Manual
energization of a completely open diameter in 1 1/2 CB switchgear is allowed by
internal logic.
Voltage selection for a single circuit breaker with double busbars
The setting CBConfig selected for Double Bus activates the voltage selection for
single CB and double busbars. This function uses the binary input from the
disconnectors auxiliary contacts B1QOPEN-B1QCLD for Bus 1, and B2QOPEN-
B2QCLD for Bus 2 to select between bus 1 and bus 2 voltages. If the disconnector
connected to bus 1 is closed and the disconnector connected to bus 2 is opened the
Section 12
Control
M14837-3 v11
M14836-3 v9
M14838-3 v9
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