| 摘要 |
PROBLEM TO BE SOLVED: To provide a digital protective controller easy of adjustment. SOLUTION: This device filters an analog signal which shows the quantity of electricity of a power system by analog filters 110-1 -110-n , and this signal is temporally divided by a multiplexer 120, and is converted into a digital signal by an analog/digital converter 130. At the time of adjustment of an error, this has a specified reference signal inputted through analog filters 110-1 -110-n from a highly precise oscillator 510, and inputs the reference signal specified above directly not through the analog filters 110-1 -110-n . A DSP150 being a correction factor operating means operates from the signal where an offset error, a gain error, and a phase error are superposed on this reference signal by an analog input system, and operates an offset error correction factor to correct the offset error, based on the output signal of a first digital filter, and operates a gain error correction factor and a phase error correction factor to correct the gain error and the phase error. Moreover, DSP150 corrects the error from these correction factors. |
