EDR-5000 IM02602007E
Working Principle Sync-check (System-to-System)
(Please refer to the block diagram on next page.)
The sync-check function for two systems is very similar to the sync-check function for generator-to-system except there
is no need to take the breaker closing time into account. The sync-check element measures the three phase-to-neutral
voltages »
VA«
, »
VB«,
and »
VC«
or the three phase-to-phase voltages »
VAB«
, »
VBC«,
and »
VCA«
of the station
voltage bus bar. The line voltage Vx is measured by the fourth voltage input. If all synchronous conditions are fulfilled
(i. e.: ΔV [VoltageDiff], ΔF [SlipFrequency], and Δφ [AngleDiff]) are within the limits, a signal will be issued that both
systems are synchronous.
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