Sync Check Relay

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.

Sync check relay.

The synchro check relay spau 140 c can be used for both synchro check functions and voltage check functions. Check synchronous relay setting. I have used the check synchronous relay with the setting of 1 5 mismatch. Today these are digital microprocess.

Synchrocheck relays ensures that bus and line side voltages are within programmed differentials of voltage magnitude phase angle frequency and phase rotation is the same. Connecting two electrical systems that are not closely matched can cause expensive damage and disturbance to the electrical. The synchro check function is used when two separate networks or two electrically. The synchro check relay can be used to assist in the semi automatic parallelling of two ac power systems.

The volt free relay contacts change state when the voltage level phase relationship and frequency are within the selected synchronising limits. Sync check relay synchronism check relay are relays that allow unattended synchronization of a machine with a system. 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.