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Section 10
Control
168
use of different voltages on the bus and line, the factor is deducted from the line
voltage before the comparison of the phase angle values.
The frequency on both sides of the circuit breaker is also measured. The function is
only released if the frequency difference is less than the fixed set value of +/-5 Hz.
Two sets of settings for frequency difference and phase angle difference are available
and used for the manual closing and autoreclose functions respectively, as required.
The inputs BLOCK and BLKSC are available for total block of the complete
SESRSYN function and selective block of the Synchrocheck function respectively.
Input TSTSC will allow testing of the function where the fulfilled conditions are
connected to a separate test output.
The outputs MANSYOK and AUTOSYOK are activated when the actual measured
conditions match the set conditions for the respective output. The output signal can be
delayed independently for MANSYOK and AUTOSYOK conditions.
A number of outputs are available as information about fulfilled checking conditions.
UOKSC shows that the voltages are high, UDIFFSC, FRDIFFA, FRDIFFM,
PHDIFFA, PHDIFFM shows when the voltage difference, frequency difference and
phase angle difference conditions are out of limits.
Output INADVCLS, inadvertent circuit breaker closing, indicate that the circuit
breaker has been closed at wrong phase angle by mistake. The output is activated, if
the voltage conditions are fulfilled at the same time the phase angle difference
between bus and line is suddenly changed from being larger than 60 degrees to smaller
than 5 degrees.
1MRK 505 288-UEN A
Technical manual
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