ABB SYN 5201 Operating Instructions Manual page 16

Operating Instructions
Synchronous sources and no-voltage lines
It is called synchronous sources, if the two lines to be paralleled are synchronous before
the circuit breaker is closed.
If the paralleling conditions (CHK RELEASE) or dead bus conditions (DB RELEASE) are
fulfilled during the monitoring time t supervis, a command is generated immediately after
the expiry of t supervis. That means that a zero-passage of the phase-angle difference
need not occur.
Multiple commands
The multiple commands function (MULTIPLE CMD) allows several commands in a
synchronization sequence or blocks command generation after the first paralleling
command of each synchronization sequence.
2.3 Test functions
In order to match the SYNCHROTACT 5 to the installation, three test functions are
provided:
1. TEST ton: determines the paralleling time and tunes the measuring voltages with
the circuit breaker closed
2. TEST U-Match: tunes the voltage matcher to the voltage regulator
3. TEST f-Match: tunes the frequency matcher to the governor
The way the different test functions work is explained in the following:
2.3.1 TEST ton
This test function closes the circuit breaker. As a start condition, voltage must be
present on one side of the circuit breaker (>Umin) and no voltage present on the other
side (<U0max). After the breaker is closed, SYNCHROTACT 5 measures how long it
takes until voltage is present at both measuring inputs. At the same time, after the
breaker is closed the voltage difference is measured, which can then be tuned to zero
by means of the parameter  U Offset.
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SYN 5201/SYN 5202
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