Numerical O/C + Current Unbalance Relay For Capacitor Bank :ADR221CGeneral DescriptionADR221C is second generation Numerical Integrated Feeder Protection Relay for Traction Application. It consist all the necessary protection and monitoring functions required for traction feeder.Disturbance Recorder. 50 cycles of actual waveform of voltage & current (45 pre-fault & 5 post fault) are captured & saved in the builtin memory with date time stamping, for analyzing fault condition. Separate Communication Ports for SCADA (RS485) as well as Local testing (RS232C) Fully communicable with IEC standard open protocol. Very low burden on CT (less than 0.2VA) and PT (less than 0.2 VA). Online display of R, X, V, I CB status and other digital and logical status. Continuous monitoring of module’s internal hardware and alarm generation in case of failure of any critical components. Facility to synchronised Relay time with external GPS network. 10 Digital Output contacts for local alarm as well as tele-signalling. 9 Optically isolated digital status input for monitoring of status and avoid used of external relay logic. 100 nos of event memory, event such CB close, Trip, digital status change, relay pkp etc. All events are with date and time stamped up to 1ms.Specially designed for 25kV Shunt Capacitor Protection. As per RDSO specs TI/SPC/PSI/PROTCT/6070 (9/08) 2 Element (1 OC + 1 CUR) over current IDMT with Current Unbalance Relay. Breaker Failure detection. In-built CB trip circuit monitoring during close as well as open condition. large 20x4 LCD display for Parameter and setting display.