Sync Check Relay Sel

The sel 451 5 based a25a is sold as a configuration and documentation disc.

Sync check relay sel.

Connecting two electrical systems that are not closely matched can cause expensive damage and disturbance to the electrical. The sel 351 relay has built in ethernet and ieee c37 118 synchrophasors and is ideal for directional overcurrent applications. The synchro check relay can be used to assist in the semi automatic parallelling of two ac power systems. Regardless of the synchronizing settings the close permissive contact s 25a1 and or25a2 will only assert if the generator frequency is above.

It provides voltage protection functions including over undervoltage loss of phase over underfrequency monitoring and sync check. The volt free relay contacts change state when the voltage level phase relationship and frequency are within the selected synchronising limits. Optional mirrored bits communications and power quality monitoring add flexibility to solutions. The sel 351 is the protection standard for utility and industrial electrical systems around the world.