| 摘要 |
PROBLEM TO BE SOLVED: To facilitate the intermixture of 32-bit type terminals and 16-bit type terminals in a loop system protective relay apparatus. SOLUTION: An input datum Xn-1 inputted last time and an input datum Xn-2 inputted two times before which are subjected to the A/D conversion by the input unit of a 32-bit terminal and a phase angleθby which a waveform is delayed are obtained from a sampling period, the timing of A/D conversion, a multiplexer switching time and an angular velocity. Further, from the phase angle, the sampling period, a crest value, etc., the correction factors Km0 and Km1 of a channel (m) are obtained. Sampling data are corrected and subjected to an arithmetic process of an =K0 .Xn-2 +K1 .Xn-1 by an FIR-type digital filter in accordance with software to obtain an output datum an which agrees with the sampling waveform a(t) of a 16-bit type terminal which is an input waveform X(t) whose phase is delayed by the phase angleθand the datum an is subjected to a relay arithmetic process as a current datum.
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