supply and installation of numerical relay supply and installation of numerical relay in place of defective relays at various substations under etd , haldwani , detail of supply , supply of draw out relay with pc front port communication having following discription : element ( 3 phase +ef ) non directional , over current idmt/dmt , port for scada communication , instantaneous over current protection with adjustible timer , on site ct secondary selection 1a or 5 a , power supply input range 18 volt to 250 volt ac/dc , event recording ( 512 nos ) , fully communicable with iec standard open protocol with harmonic blocking and unblocking feature , relay found defective carrying out comprehensive dismentalling of old relay and control wiring and retrofitting sheet fitting of new numerical relay and boards cutting and fixing of board in pannel with pt wiring testing after installtion of new relay . testing of numerical relay by secondary/ primary injection sets .