Patent ID: 8711913

Claim:
A device for processing input data of a protective relay, the device comprising: a detecting unit configured to detect a voltage and current; an analog-digital converting unit configured to convert an analog signal input via the detecting unit into digital data, the digital data comprising event data, fault data, wave data, and demand data; a memory configured to store data; and a digital signal processing unit comprising a measurement accumulation buffer and an update accumulation buffer, the digital signal processing unit configured to: perform an RDFT (Recursive Discrete Fourier Transform) operation on the digital data input via the analog-digital converting unit; buffer the RDFT-operated data in the measurement accumulation buffer and the update accumulation buffer; control the memory to store the buffered data item-by-item; and in every period, input a value of the update accumulation buffer to the measurement accumulation buffer and initialize the value of the update accumulation buffer to ‘0’.