All the relay are designed using latest numerical technology and having programmable digital input and outputs to minimized external contact multiplication electromechanical relays. All relays are tested for EMI / EMC noise as per international IEC specifications. The basic electronics hardware is common for all relays. The user interface for all relays are similar only protection logic is different, this make very easy to use. General features of all relays are as given belowLarge 20x4 LCD display Password Protection for all setting Disturbance Recorder. 50 cycles of actual waveform of voltage & current (45 pre-fault & 5 post fault) are captured & saved in the built-in memory with date time stamping, for analyzing fault condition & fault location. IEC 601870-5-103 or IEC61850 Protocol. Separate Communication Prot for SCADA (RS485) as well as Local testing (RS232C). Very low burden on CT and PT. Site Selectable CT Secondary Online display of V,I,Active/Reactive Power, Primary secondary parameter, Logical / Physical status etc. Continuous monitoring of module's internal hardware and alarm generation in case of failure of any critical components. Facility to synchronized Relay time with SCADA network. 8 Digital Output contacts for local alarm Tele-signalling & Control. 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, status change, relay pkp etc. All events are with date and time stamped up to 1msStandard SpecificationsTransformer Differential + Over Current + Restricted Earth Fault./li> 3 element Over current IDMT/DMT with instant trip./li> Programmable Starting Current & Dual Bias Characteristics Wide Bias Setting 10% to 50% Programmable Pick-up characteristic Harmonic Restrain for Transformer Charging & CT Saturation condition Instantaneous Protection with adjustable timer. Software base Vector group selection. Non Restrain Time delay backup protection Breaker Fail & Trip Circuit Supervision function.The relay is designed using modular removable terminal, having CT sorting arrangement. This make very easy for removing relay for maintenance and calibration and testing. Most of the relays are multifunction and having large numbers of setting.