Patent ID: 8155796
Filing Date: 2012-04-10
Classification: H02H

Abstract:
1. A protective relay device comprising: a data receiving circuit that receives data from a plurality of digitizing units each digitizing a system electrical quantity; a plurality of data buffer circuits each storing therein the data received by the data receiving circuit in time series for each of the digitizing units; a plurality of digital filtering processing circuits each performing a predetermined digital filtering process on an output of each of the data buffer circuits; a plurality of first data storing circuits each storing therein an output of each of the digital filtering processing circuits in time series as time data; a plurality of second data storing circuits each storing therein latest time data for each of the digitizing units from among time data stored in each of the first data storing circuits; and a digital computing unit that sets an oldest time from among latest times represented by the latest time data stored in the second data storing circuits as a reference time, extracts data at a same time as the reference time from the first data storing circuits, and performs a protective computation with extracted data.