The utility model discloses a IED is synthesized to intelligent substation transformer, including the treater, the treater connects gradually ethernet chip and photoelectric conversion module, optic fibre and the communication of station accuse layer service ware are passed through to the photoelectric conversion module, the treater is pegged graft with power module, the treater passes through the RS485 circuit and pegs graft with the signal acquisition board, the treater still is connected with RS232 interface, USB interface, SD card, FLASH module, SDRAM module and CAN bus module. Comprises a processo, the signal plate adopts the plug -in components formula, debugging easy to assemble on the one hand, and on the other hand can change the monitoring that different equipment were realized to the signal plate.