| 摘要 |
PURPOSE:To reduce the cost and improve the productivity by getting a plurality of digital filter outputs different in filter characteristics, in DSP, to the analog input signal taken in from a power system. CONSTITUTION:For DSP1j, based on the instruction stored in a ROM1k, the input data stored in a buffer RAM1e and the filter coefficient stored in a dual port RAM1h are input. Moreover, the DSP1j performs the digital filter operation by the input data taken in, the filter coefficient, and the operation formula. At this time, it is so made that it may be two outputs to one input, and the output data are stored in the dual port RAM1h. The protective operation side selects the output data of this filter, according to the system of a protective relay, and these are input through an INF circuit 1i and a standardized bus 1. |
