ABB Relion 650 Series Technical Manual page 297

1MRK 506 326-UUS B
The inputs BLOCK and BLKENERG are available for total block of the complete SESRSYN (25)
function respective block of the Energizing check function. TSTENERG will allow testing of the
function where the fulfilled conditions are connected to a separate test output.
10.1.7.5 Voltage selection
The voltage selection module including supervision of included voltage transformer fuses for the
different arrangements is a basic part of the SESRSYN (25) function and determines the
parameters fed to the Synchronizing, Synchrocheck and Energizing check functions. This includes
the selection of the appropriate Line and Bus voltages and fuse supervision.
The default voltages used will be VLine and VBus1. This is also 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 the Synchronism check
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.
10.1.7.6 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 (25) functions 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 VB1OK/VB2OK and VB1FF/VB2FF inputs are related to the busbar voltage and the VLNOK and
VLNFF 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 synchronism check function
requires full voltage on both sides and will be blocked automatically in the event of fuse failures.
10.1.7.7 Voltage selection for a single circuit breaker with double busbars
This function uses the binary input from the disconnectors auxiliary contacts BUS1_OP-BUS1_CL
for Bus 1, and BUS2_OP-BUS2_CL 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.
The function checks the fuse-failure signals for bus 1, bus 2 and line voltage transformers. Inputs
VB1OK-VB1FF supervise the fuse for Bus 1 and VB2OK-VB2FF supervises the fuse for Bus 2. VLNOK
and VLNFF supervises the fuse for the Line voltage transformer. The inputs fail (FF) or healthy
(OK) can alternatively be used dependent on the available signal. If a fuse-failure is detected in the
selected voltage source an output signal VSELFAIL is set. This output signal is true if the selected
bus or line voltages have a fuse failure. This output as well as the function can be blocked with the
input signal BLOCK. The function logic diagram is shown in figure 149.
Line distance protection REL650
Technical manual
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Section 10
Control
M14836-3 v5
M14837-3 v6
M14838-3 v6
291