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 synchro check relay can be used to assist in the semi automatic parallelling of two ac power systems. The sel 300g actually all sel relays configured with sync check must be connected with the generator voltage syncp on terminals z09 z10 z11 z12 and the system voltage vs on terminals z15 z16. The sel 351 is the protection standard for utility and industrial electrical systems around the world.

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