Being the abnormal sign decision device which takes in

摘要

PROBLEM TO BE SOLVED: To provide an abnormality sign determining device for electric quantity data, having high sensitivity and reliability obtained by calculating a coefficient of correlation on each pair of a large amount of input electric quantity data input into a plurality of protective control measuring instruments and determining an abnormality sign on the basis of the coefficient of the correlation.;SOLUTION: The electric quantity at the same point in a power system is captured in three or more digital protective control measuring instruments 3_-1 to 3_-N, and a Pearson's product-moment correlation coefficient is used to determine an abnormality sign in instrument transformers (VT, CT) 4_-1 to 4_-N or an abnormality sign in an analog circuit provided to the protective control measuring instruments 3_-1 to 3_-N.;COPYRIGHT: (C)2010,JPO&INPIT