Technical description
2 Protection functions
2.10 Synchrocheck (25)
VM55.EN005
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* Voltage measurement of the 50-series relays should be at the same
potential with the grounding of the relay. Normally this happens
“automatically” on field but pay attention when doing tests with the
relay.
Figure 2.10-4 One synchrocheck stage with “3LN+LNy”-mode.