Rev.01
65/151
Voltage Difference
0.05
2.00
0.01
xUn
0.10
Phase Difference
2
90
1
Degrees
2
Frequency Difference
0.060
10.000
0.001
Hz
0.500
Synchrocheck Time
0.020
300.000
0.001
s
1.000
In case the line or bar or both are dead (LLDB, DLLB, DLDB situations) it is not necessary the
synchronism to close the switchgear.
Transitions from dead to live and vice versa are timed with a user adjustable time (
Voltage Supervision
Time
).
When the line and the bar are alive is the time to check the conditions of voltage magnitude, phase and
frequency differences between line voltage and bar voltage to allow the closing. Also, it is verified that
these conditions of voltage magnitude, phase difference and frequency differences are maintained over
a set time (
Synchrocheck time
) to confirm that it is not a temporary situation.
Please, take into account the synchronism depends on three measurements: voltage measurement and
phase measurement are achieved in 1 cycle, but frequency measurement may need 8 cycles to achieve
a stable measure, so the synchrocheck time should be set according to this limitation.
If those conditions of synchronism are maintained during synchrocheck time, close permission will be
allowed (state
Synchocheck
).
8.2.1
Synchronism (25) and AC Reclosing Device (79)
To close the circuit breaker when the reclosing device (79) is permitted, when both line & bar are alive
it is necessary to achieve sync conditions. Only when these sync conditions are achieved, the recloser
has the permission to close the circuit breaker.
To supervise the reclosing, it is necessary to set the
Syncrocheck
state of 25 function to the logical
signal
79Enable
. Also, the states
DLDB
,
DLLB
and
LLDB
should be added to this logic signal (OR
gate) as in those cases there is nothing to synchronize.
If the parameter
Hold Enable
of 79 function is set to No, any external condition
won’t
be considered
and 79 function will work normally.
If
Hold Enable
of 79 function is set to Yes or No Time and the states DLDB, DLLB, LLDB and
Synchrocheck of 25 function are associated to the logic signal 79 Enable, following cases can occur:
1. If line, bar or both are dead, the circuit breaker will always reclose because synchronism is not
necessary.
2. If both, line and bar, are alive it will reclose only when the conditions of synchronism are
achieved. If Hold Time is set to No time it will wait until those conditions are accomplished. If
Hold Time
is set to Yes, if those conditions are not fulfilled in the time set in
Hold Time
it will
go to
Lockout
.
8.2.2
Synchronism (25) and Closing Breaker Command
If necessary, the same strategy can be used to supervise a manual closure. Using the logical gates
available on SILG, a coordination of states can be set to supervise the closing command.
Summary of Contents for SIL-G
Page 1: ...USER S MANUAL USER S MANUAL SIL G Feeder Relay...
Page 8: ...www fanox com Rev 01 8 151 2 3 Connection diagrams 2 3 1 Analog current connections...
Page 10: ...www fanox com Rev 01 10 151 3 VT configuration phase neutral...
Page 11: ...www fanox com Rev 01 11 151 3 VT configuration phase neutral residual voltage...
Page 12: ...www fanox com Rev 01 12 151 3VT configuration phase phase residual voltage...
Page 13: ...www fanox com Rev 01 13 151 2VT configuration phase phase residual voltage...
Page 14: ...www fanox com Rev 01 14 151 3 VT configuration phase neutral phase B line voltage...
Page 27: ...www fanox com Rev 01 27 151 Dimensions 175x175x150 3 3 Functional diagram...
Page 28: ...www fanox com Rev 01 28 151...
Page 69: ...www fanox com Rev 01 69 151 General trip...
Page 88: ...www fanox com Rev 01 88 151...
Page 89: ...www fanox com Rev 01 89 151...
Page 90: ...www fanox com Rev 01 90 151...
Page 95: ...www fanox com Rev 01 95 151 Time Minutes Seconds Milliseconds...
Page 150: ...www fanox com Rev 01 150 151 NOTES...
Page 151: ...www fanox com Rev 01 151 151...
