Configuration; General - ABB RELION REB500 Technical Manual

1MRK 505 406-UEN B
5.7.6

Configuration

5.7.6.1

General

It is only permissible to connect two energized parts of a power system, if the difference
between the amplitudes of their voltages and the phase-shift between them are within
acceptable limits.
The purpose of the synchrocheck function is to determine these parameters and decide
whether it is permissible to connect the systems in parallel.
The function thus issues an enable signal (PermitToClose), providing the voltages of the two
systems are higher than the set minimum voltage (
• the difference between the voltage amplitudes |dU|
• the phase-shift |dPh|
• the difference between the frequencies |df|
do not exceed the limits set for the parameters
the adjustable time
According to the operating mode (Operat.-Mode) selected, the function also permits de-
energized parts of a power system to be coupled.
Provision is also made for switching between voltage inputs belonging to the busbars of a
double busbar station by appropriately controlling two binary inputs (uBus1Activ and
uBus2Activ).
Note that the function can only check the synchronism of two voltages at any one time, that of
one of the busbars and that of the line.
The synchrocheck function is therefore used mainly:
• to connect infeeds in parallel and to connect outgoing feeders to the system
• to interconnect two synchronous or asynchronous parts of a power system
• in autoreclosure schemes
• as a safety check when carrying out manual switching operations.
Application example: Feeder connected to double busbars
Bay protection functions REB500
Technical manual
supervisTime .
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minVoltage ) and
maxVoltDif , maxPhaseDif and maxFreqDif for
Section 5
Bay protection functions
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