Sync Check Relay Sel

Connecting two electrical systems that are not closely matched can cause expensive damage and disturbance to the electrical.

Sync check relay sel.

It provides voltage protection functions including over undervoltage loss of phase over underfrequency monitoring and sync check. 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. The sel 351 is the protection standard for utility and industrial electrical systems around the world.

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. The sel 451 5 based a25a is sold as a configuration and documentation disc. 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 volt free relay contacts change state when the voltage level phase relationship and frequency are within the selected synchronising limits.