bids are invited for basic data:minimum 1 gb internal memory, ip40 & above in installed condition, minimum input channel - 16- input for voltage & current, minimum (4/8) -output channel for mointoring & alarm activation. voltage inputs accuracy < 0.1 %, recorder, sampling rate:25.6 khz@50hz i.e. 512 samples per cycle, powerful recorder triggering , online streaming of voltages and currents, at 25.6 khz sampling rate.communication protocols:modbus rtu – modbus tcp/serial and tcp ip protocols /61850/ any other . time synchronisation protocols : the recording system accepts gps time synchronization signals from any standard gps master clocks with irig-b ports. interfaces: rs232/rs485 on terminals/rj45 (10/100 mbit)/usb, auxiliary power supply rating standard auxiliary voltage ranges from 48v - 250v dc or ac supply of100 - 265v ac, software for communication : following basic functions (minimum) : a). 32-bit/64-bit windows program interface, b). database for saving the measured values per measuring point, c) data access facility, d) visualization option for all measured variables retrievable , e) automatic reporting, f) automatic export functions and fault report transmission g) one additional workstation license for one windows user & one printer to be included. ambient temperature :for operation(-25 to +55) deg cent., relative humidity: 5...95 %, analog and digital input sampling rate:minimum 256 samples/cycle (12.8khz) & minimum 512 samples/cycle (25.6 khz)., application: for 220kv switchyard. additional features: system healthy indication, high and low magnitude level trigger for each input channel,(high/low) state change triggers. pre fault & post fault recording length with user configurable,trend recording up to one hour interval , with a minimum 90 day analog measurement trend log . all recorder channels and calculated values available for trending.the recorders with provision for long term continuous recording analog channels. sampling rate for continuous recording shall be programmable from 5 to 50 records per second per channel. with the continuous s recording facility shall record the data continuously (without setting the triggers) for user selectable inputs. total quantity : 2