Typical values for a phase-shift setting (
maxPhaseDif) of 10°:
maxFreqDif
supervisTime
200 mHz
100... 200 ms
100 mHz
250... 450 ms
50 mHz
600...1000 ms
Minimum function operating time
The minimum operating time achieved by the function, that is, the shortest possible time
between the instant the synchronism conditions are fulfilled for the first time and the
generation of the signal enabling the circuit-breaker to be closed
PermitToClose, is given by
the sum of the measuring time setting
supervisTime and the pick-up response time tv of the
function.
Minimum operating time = (supervisTime) + tv
Autoreclosure dead time
In an autoreclosure scheme, the dead time set for the autoreclosure function must be at least
as long as the minimum operating time of the synchrocheck function given above in order to
permit the synchrocheck function to issue an enable signal (
PermitToClose) within the dead
time:
Dead time ≥ minimum operating time = (supervisTime) + tv
Reset time (t-Reset)
From the instant that one or more of the synchronism conditions are no longer fulfilled, the
enabling signal output (
PermitToClose) and the pick-up signal reset after the time set for
t
‑
Reset.
This ensures a CB closing signal can be maintained for a certain minimum time.
Typical value:
t-Reset 50 ms
Where high slip frequencies df are to be expected,
t
‑
Reset must be short
enough to prevent the phase-shift from exceeding the set permissible range of
phase-angles (-PhaseDiff to + PhaseDiff) during the reset time.
5.7.6.3
Supplementary information for binary inputs
GUID-622840DB-B163-4701-81B9-B8F3191E5563 v1
Inputs for switching between analogue busbar inputs (uBus1Activ,
uBus2Activ)
Where the two busbar inputs (Bus I/P1 and Bus I/P2) have been configured for a double busbar
installation, the measurement can be switched from one busbar to the other by signals
corresponding to the isolator positions applied to the inputs uBus1Activ and uBus2Activ:
uBus1Activ
uBus2Activ
Analogue inputs for synchronisatiom
(T) TRUE
(F) FALSE
uBusInput1 and uLineInput
(F) FALSE
(T) TRUE
uBusInput2 and uLineInput
1MRK 505 406-UEN B
Section 5
Bay protection functions
Bay protection functions REB500
127
Technical manual
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