CONTROL SYSTEM, TRANSFORMER, SECURITY CONTROL DEVICE, AND BITSTREAM MEMORY UNIT

摘要

An analog/digital conversion unit (2), which introduces an analog electric quantity provided from an electric power system and converts the analog electric quantity into a digital quantity, includes a ӣ modulating device (22) which samples the analog electric quantity provided by the electric power system with a predetermined modulation frequency and outputs a bit stream changing over time of single bit obtained by performing ӣ modulation. A digital operation processing unit (3), which performs protection control operation regarding a state of the electric power system using the digital quantity, includes one or more digital filters (23) which inputs the bit stream from the ӣ modulating device (22) and of which frequency characteristics differ according to a type of protection control operation, and one or more operation processing elements (24) which are connected to each digital filter (23) and which perform different kinds of protection control operation processing regarding protection control, based on the bit stream provided by the digital filter (23).