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If both sides are higher than 80% of the
Ubase
values, the measured values are compared
with the set values for acceptable frequency, phase angle and voltage difference:
FreqDiff
,
PhaseDiff
and
VDiffSC
. If a compensation factor is set due to the 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
(25) function and selective block of the Synchronism check 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.
VOKSC shows that the voltages are high, VDIFFSC, 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.
Section 10
1MRK 511 287-UUS A
Control
228
Technical manual
Содержание REC650 ANSI
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