Sync Check Relay Sel

The volt free relay contacts change state when the voltage level phase relationship and frequency are within the selected synchronising limits.

Sync check relay sel.

The sel 351 relay has built in ethernet and ieee c37 118 synchrophasors and is ideal for directional overcurrent applications. It provides voltage protection functions including over undervoltage loss of phase over underfrequency monitoring and sync check. Optional mirrored bits communications and power quality monitoring add flexibility to solutions. Voltage relays vr 300 the vr 300 is a fixed mounted industrial grade protective relay that offers multiple protective features in a single package.

The synchro check relay can be used to assist in the semi automatic parallelling of two ac power systems. Sel combines engineering services with the field proven sel 451 5 relay for advanced autosynchronizing a25a systems with the features and flexibility that customers have come to expect from sel products and systems. Connecting two electrical systems that are not closely matched can cause expensive damage and disturbance to the electrical. Regardless of the synchronizing settings the close permissive contact s 25a1 and or25a2 will only assert if the generator frequency is above.