The synchro check relay spau 140 c can be used for both synchro check functions and voltage check functions.
Sync check relay.
Today these are digital microprocess.
This relay contains the allowable percentage of mismatch of voltage and frequency.
The synchro check relay can be used to assist in the semi automatic parallelling of two ac power systems.
The numerical synchro check relay type spau 140 c is a voltage measuring relay designed to be used when two power systems are to be connected together.
I have used the check synchronous relay with the setting of 1 5 mismatch.
Check synchronous relay setting.
It means we can do still synchronization with the 1 5 voltage or frequency mismatch.
Synchro check or sync check relays are used to verify that voltage phase angle frequency and phase rotation across two sides of a breaker are the same prior to closing the breaker.
The volt free relay contacts change state when the voltage level phase relationship and frequency are within the selected synchronising limits.
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Connecting two electrical systems that are not closely matched can cause expensive damage and disturbance to the electrical.