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 bus
1 voltage is used. All other combinations use the bus 2 voltage. The outputs B1SEL
and B2SEL respectively indicate the selected Bus voltage.
Section 14
1MRK502052-UEN B
Control
638
Technical manual
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