Electric current differential conservation relay device

摘要

P To secure calculation accuracy in accident determination and improve the certainty of the accident START even when an inexpensive communication line is used in a current differential protective relay device. PSOLUTION: As the amount (Δ iSB1/SB (t)) of rotation vector variation in time and the amount of one-end current rotation vector variation is calculated, which is a difference component between a current one-end current rotation vector and the one-end current rotation vector at a point of time one or more cycles before and as the amount (Δ iSB12/SB (t)) of spatial rotation vector variation, the amount of both-end current rotation vector variation is calculated and which is the difference component between the one-end current rotation vector and the other-end current rotation vector at the current time. Based ON the amplitude of the amount of the one-end current rotation vector variation which is an amplitude value of the amount of the one-end current rotation variation, and the amplitude of the amount of both-end current rotation vector variation which is an amplitude value of the amount of the both-end current vector variation and whether an accident has occurred in a protective zone is determined. PCOPYRIGHT: (C)2010 and JPO& INPIT