Protective Elements
Working Principle Synchrocheck (System-to-System)
(Please refer to the block diagram on next page.)
The synchrocheck function for two systems is very similar to the synchrocheck function for generator-to-system
except there is no need to take the breaker closing time into account. The synchrocheck element measures the
three phase-to-neutral voltages »
VL1«
, »
VL2«,
and »
VL3«
or the three phase-to-phase voltages »
VL1-L2«
, »
VL2-
L3«,
and »
VL3-L1«
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.
940 MCDGV4 DOK-HB-MCDGV4-2E
To Next Page
