| 摘要 |
There is provided a power device for preventing malfunction of a protecting relay by determining whether surge generated in an electric power system and introduced to the power device is a surge signal. The protecting relay may include: an input conversion unit (100) configured to receive the analog signal and sample the analog signal according to a pre-set sampling period; a multiplexer (200) configured to selectively output any one of a plurality of signals output from the input conversion unit; a programmable gain amplifier (PGA), 300, configured to set different gain values according to signals output from the multiplexer, and amplify a signal output from the multiplexer with a pre-set gain value; an analog-to-digital converter (ADC), 400, configured to convert an analog signal output from the PGA into a digital signal; and a controller (500) configured to determine whether the analog signal received through the input conversion unit includes a surge signal based on the plurality of sampled data which have been converted into the digital signal, and determine whether to perform a relay function based on the determination results. Fig. 1 |
