Numerical Check Synchronising Power Protection Relay : ADR217BSpecificationsDefinite Time Sync-Check Protection for paralleling two power source. Phase angle limit is adjustable over the range of 1 to 90 degrees. Time delay is adjustable over a range of 0.1 to 99 seconds. Voltage monitoring circuits provide independent determination of Bus-A and Bus-B or Bus-A to Bus-B voltage levels for selectable closing conditions. Voltage difference provides additional verification of proper breaker closing conditions. Large 20x4 LCD display for Parameter and setting display. Online display of line voltage and bus Voltage, CB status and other digital and physical status. Continuous monitoring of module’s internal hardware and alarm generation in case of failure of any critical components. Fully communicable with IEC standard open protocol. 100 nos of event memory, 10 nos of Fault data stored with keypad interface and time stamping.ADR217B is second generation Numerical sync-check Relay. It consists all the necessary protection and monitoring functions required for synchronising two power sources All the relay are designed using latest numerical technology and having programmable digital input and outputs to minimized external contact. Relays design tested for EMI / EMC noise as per international IEC specifications. General features of all relays are as given below