PCM伝送による電流比較継電方式

概要

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In this paper we deal with a new system of protective relay in which the informations on line currents at the both terminals of power line are exchanged by the PCM transmission method to detect a fault in the power line. It is a very important matter by what kind of informations the line currents should be represented. The authors adopted the method of dividing the current vector into the absolute value and the phase. Both informations are sampled and quantized during the same time as the half period of the line current, and then the transmission and the comparative operation of the informations at both terminals of the line are accomplished during the same time following. Using the unit integrator, the analogue to digital converter for the absolute value of the current, developed for this system and the phase comparative system by logical operation ; the protective relay system is obtained, which puts out the command signal of trip, in spite of the comparatively simple construction, within 1. 5 cycle of line frequency after the fault happens in the power line.
信州大学工学部の論文