Edison SCM21 Synch-Check Relay

The SCM21 relay provides permissive synchronization with one or two lines against a common bus. The relay checks the voltage, frequency, and phase angle displacement between each line and the bus. When the values are with the set parameters, the SCM21 provides an contact output for permissive breaker closing. The SCM21 also provides for dead line and dead bus operation.

• Catalog Section 150-40  
• Instruction Manual S150-40-1  

The iDP-210 Feeder Relay may be used as a stand alone synch-check relay. The synch-check element of the iDP-210 offers programmable Hot Bus, Cold Bus, Hot Line and Dead Line operation, Anticipatory Close which accounts for the operting time of the circuit breaker mechanism, anti-motoring control, anti-pump logic, and permits synch against voltages of different PT ratios and phase angle displacements.

• Catalog Section 165-210  

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