| 摘要 |
<P>PROBLEM TO BE SOLVED: To individually perform a correction process without need for combining an input conversion means with an analog/digital conversion means at the time of replacing parts. <P>SOLUTION: This digital type protective relay includes the input conversion means and the analog/digital conversion means. A quantity of electricity which is outputted from the analog/digital conversion means and a quantity of reference electricity in an identical phase and an identical amplitude with the quantity of digital electricity of that quantity of electricity is inputted. This relay also includes a first phase gap/amplitude value calculating means which calculates the phase gap and the drift of amplitude value between both the input electricity quantity, a first memory means which stores data which is obtained by measuring the phase gap/the drift of amplitude value with the reference electricity quantity generated only by the input conversion means, a second phase gap/amplitude value calculating means which calculates the phase gap/the drift of amplitude value with the reference electricity quantity generated only by the analog/digital conversion means by using data stored in the first memory means and the value calculated by the first phase gap/amplitude value calculating means, and a second memory means which stores the data calculated by the second phase gap/amplitude value calculating means. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
