Paralleling protection relay PLL series

voltagephasesynchronization

The synchro-check (paralleling) protector trip relay compares the voltage, frequency and phase angle of two supplies and operates a relay according to the state of synchronisation of the supplies. If the two supplies are not synchronised, the relay operates to provide a control output. The relay output can be used for alarm or control purposes. The unit also provides a dead bus function. If the bus supply fails, the relay operates and the output can be used to switch in an emergency generator. Basic Parameters • Available with three voltage ranges • Adjustable nominal voltage range • Adjustable synch tolerance • Dead bus function on/off switch • Power on LED (green)