Eaton EDR-5000, Инструкция по установке, эксплуатации и обслуживанию, Страница: 635 / 1017

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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