Choosing the operating mode of the synchrocheck function (‘Operat.-
Mode’)
Basically, an enable signal will always be issued, if the conditions for synchronism (dU, dPh and
df) are fulfilled for the prescribed period and both systems, that is, busbar and line, are
energized (voltage >
minVoltage).
In cases where closure of the circuit-breaker should also be enabled when one system is de-
energized (voltage <
maxVoltage), for example, connection of a radial feeder, this can be
achieved by appropriately setting the parameter
Operat.-Mode:
Table 85: Setting of Operat.-Mode
Operat.-Mode
Closure enabled when:
Only SyncChk
Synchronism conditions fulfilled AND (busbar > minVoltage AND line >
minVoltage)
BusD & LineL
Only SyncChk OR (busbar < maxVoltage AND line > minVoltage)
BusL & LineD
Only SyncChck OR (busbar > minVoltage AND line < maxVoltage)
BusD XOR LineD
Only SyncChk OR (busbar < maxVoltage AND line > minVoltage) OR (busbar
> minVoltage AND line < maxVoltage)
BusD & LineD
Only SyncChk OR (busbar < maxVoltage AND line < maxVoltage)
BusD OR LineD
Only SyncChk OR (busbar < maxVoltage OR line < maxVoltage)
BusD
Only SyncChk OR busbar < maxVoltage)
LineD
Only SyncChk OR line < maxVoltage)
Remote operating mode selection
Four of the five operating modes can be selected by external signals applied to two of the
function’s binary inputs (
OpModeInp1 and OpModeInp2).
Table 86: Operating modes selected by external signals
Binary input signals
Operating-Mode
OpModeInp1
OpModeInp2
(F) FALSE
(F) FALSE
Mode specified in the control program (
Operat.-Mode)
(F) FALSE
(T) TRUE
Synchrocheck OR (bus dead AND line live)
(T) TRUE
(F) FALSE
Synchrocheck OR (bus live AND line dead)
(T) TRUE
(T) TRUE
Synchrocheck OR (bus dead AND line live) OR (bus live
AND line dead)
Choice of phase for the voltage inputs on the busbar and line sides
(uBusInp-Ph, uLineInp-Ph)
The phase voltage (
uBusInp-Ph, uLineInp-Ph) to be used for determining synchronism can be
entered separately for busbar and line inputs (to facilitate individual adjustment of phase-
angle and amplitude).
All single and three-phase voltages are available for line voltage setting (1ph L1L2, L2L3 or L3L1;
1ph L1E, L2E or L3E; 3ph Y; 3ph Δ) and all single-phase voltages for bus voltage setting
(1ph L1L2, L2L3 or L3L1; 1ph L1E, L2E or L3E), but the ones chosen must agree with the setting
for the corresponding input channels (see
Where both busbar inputs are in use, the definition of the phase (‘uBusInp-Ph’) applies to both
busbars.
1MRK 505 406-UEN B
Section 5
Bay protection functions
Bay protection functions REB500
125
Technical manual
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